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author | Mohamed Tarek <mt@rockbox.org> | 2010-04-29 15:14:43 +0000 |
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committer | Mohamed Tarek <mt@rockbox.org> | 2010-04-29 15:14:43 +0000 |
commit | 67f7ecf731d14f732db9d685aefd011f770d21a3 (patch) | |
tree | 680e77d8aeb617a9bec23629f20a35839e737f8c /apps/codecs/libwmapro/wmaprodec.c | |
parent | c740af20e70ddc863c3a71f3b25e51b2a20b6795 (diff) | |
download | rockbox-67f7ecf731d14f732db9d685aefd011f770d21a3.tar.gz rockbox-67f7ecf731d14f732db9d685aefd011f770d21a3.zip |
Revert r25739 which added libwmapro to apps/codecs, in preparation to commit the unmodified ffmpeg files first, for the sake of a consistent/complete svn history.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25758 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'apps/codecs/libwmapro/wmaprodec.c')
-rw-r--r-- | apps/codecs/libwmapro/wmaprodec.c | 1594 |
1 files changed, 0 insertions, 1594 deletions
diff --git a/apps/codecs/libwmapro/wmaprodec.c b/apps/codecs/libwmapro/wmaprodec.c deleted file mode 100644 index 66d926d813..0000000000 --- a/apps/codecs/libwmapro/wmaprodec.c +++ /dev/null | |||
@@ -1,1594 +0,0 @@ | |||
1 | /* | ||
2 | * Wmapro compatible decoder | ||
3 | * Copyright (c) 2007 Baptiste Coudurier, Benjamin Larsson, Ulion | ||
4 | * Copyright (c) 2008 - 2009 Sascha Sommer, Benjamin Larsson | ||
5 | * | ||
6 | * This file is part of FFmpeg. | ||
7 | * | ||
8 | * FFmpeg is free software; you can redistribute it and/or | ||
9 | * modify it under the terms of the GNU Lesser General Public | ||
10 | * License as published by the Free Software Foundation; either | ||
11 | * version 2.1 of the License, or (at your option) any later version. | ||
12 | * | ||
13 | * FFmpeg is distributed in the hope that it will be useful, | ||
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
16 | * Lesser General Public License for more details. | ||
17 | * | ||
18 | * You should have received a copy of the GNU Lesser General Public | ||
19 | * License along with FFmpeg; if not, write to the Free Software | ||
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
21 | */ | ||
22 | |||
23 | /** | ||
24 | * @file libavcodec/wmaprodec.c | ||
25 | * @brief wmapro decoder implementation | ||
26 | * Wmapro is an MDCT based codec comparable to wma standard or AAC. | ||
27 | * The decoding therefore consists of the following steps: | ||
28 | * - bitstream decoding | ||
29 | * - reconstruction of per-channel data | ||
30 | * - rescaling and inverse quantization | ||
31 | * - IMDCT | ||
32 | * - windowing and overlapp-add | ||
33 | * | ||
34 | * The compressed wmapro bitstream is split into individual packets. | ||
35 | * Every such packet contains one or more wma frames. | ||
36 | * The compressed frames may have a variable length and frames may | ||
37 | * cross packet boundaries. | ||
38 | * Common to all wmapro frames is the number of samples that are stored in | ||
39 | * a frame. | ||
40 | * The number of samples and a few other decode flags are stored | ||
41 | * as extradata that has to be passed to the decoder. | ||
42 | * | ||
43 | * The wmapro frames themselves are again split into a variable number of | ||
44 | * subframes. Every subframe contains the data for 2^N time domain samples | ||
45 | * where N varies between 7 and 12. | ||
46 | * | ||
47 | * Example wmapro bitstream (in samples): | ||
48 | * | ||
49 | * || packet 0 || packet 1 || packet 2 packets | ||
50 | * --------------------------------------------------- | ||
51 | * || frame 0 || frame 1 || frame 2 || frames | ||
52 | * --------------------------------------------------- | ||
53 | * || | | || | | | || || subframes of channel 0 | ||
54 | * --------------------------------------------------- | ||
55 | * || | | || | | | || || subframes of channel 1 | ||
56 | * --------------------------------------------------- | ||
57 | * | ||
58 | * The frame layouts for the individual channels of a wma frame does not need | ||
59 | * to be the same. | ||
60 | * | ||
61 | * However, if the offsets and lengths of several subframes of a frame are the | ||
62 | * same, the subframes of the channels can be grouped. | ||
63 | * Every group may then use special coding techniques like M/S stereo coding | ||
64 | * to improve the compression ratio. These channel transformations do not | ||
65 | * need to be applied to a whole subframe. Instead, they can also work on | ||
66 | * individual scale factor bands (see below). | ||
67 | * The coefficients that carry the audio signal in the frequency domain | ||
68 | * are transmitted as huffman-coded vectors with 4, 2 and 1 elements. | ||
69 | * In addition to that, the encoder can switch to a runlevel coding scheme | ||
70 | * by transmitting subframe_length / 128 zero coefficients. | ||
71 | * | ||
72 | * Before the audio signal can be converted to the time domain, the | ||
73 | * coefficients have to be rescaled and inverse quantized. | ||
74 | * A subframe is therefore split into several scale factor bands that get | ||
75 | * scaled individually. | ||
76 | * Scale factors are submitted for every frame but they might be shared | ||
77 | * between the subframes of a channel. Scale factors are initially DPCM-coded. | ||
78 | * Once scale factors are shared, the differences are transmitted as runlevel | ||
79 | * codes. | ||
80 | * Every subframe length and offset combination in the frame layout shares a | ||
81 | * common quantization factor that can be adjusted for every channel by a | ||
82 | * modifier. | ||
83 | * After the inverse quantization, the coefficients get processed by an IMDCT. | ||
84 | * The resulting values are then windowed with a sine window and the first half | ||
85 | * of the values are added to the second half of the output from the previous | ||
86 | * subframe in order to reconstruct the output samples. | ||
87 | */ | ||
88 | |||
89 | #include "avcodec.h" | ||
90 | #include "internal.h" | ||
91 | #include "get_bits.h" | ||
92 | #include "put_bits.h" | ||
93 | #include "wmaprodata.h" | ||
94 | #include "dsputil.h" | ||
95 | #include "wma.h" | ||
96 | |||
97 | /* Some defines to make it compile */ | ||
98 | #define AVERROR_INVALIDDATA -1 | ||
99 | #define AVERROR_PATCHWELCOME -2 | ||
100 | #ifndef M_PI | ||
101 | #define M_PI 3.14159265358979323846 /* pi */ | ||
102 | #endif | ||
103 | #define av_log_ask_for_sample(...) | ||
104 | |||
105 | /** current decoder limitations */ | ||
106 | #define WMAPRO_MAX_CHANNELS 8 ///< max number of handled channels | ||
107 | #define MAX_SUBFRAMES 32 ///< max number of subframes per channel | ||
108 | #define MAX_BANDS 29 ///< max number of scale factor bands | ||
109 | #define MAX_FRAMESIZE 32768 ///< maximum compressed frame size | ||
110 | |||
111 | #define WMAPRO_BLOCK_MAX_BITS 12 ///< log2 of max block size | ||
112 | #define WMAPRO_BLOCK_MAX_SIZE (1 << WMAPRO_BLOCK_MAX_BITS) ///< maximum block size | ||
113 | #define WMAPRO_BLOCK_SIZES (WMAPRO_BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1) ///< possible block sizes | ||
114 | |||
115 | |||
116 | #define VLCBITS 9 | ||
117 | #define SCALEVLCBITS 8 | ||
118 | #define VEC4MAXDEPTH ((HUFF_VEC4_MAXBITS+VLCBITS-1)/VLCBITS) | ||
119 | #define VEC2MAXDEPTH ((HUFF_VEC2_MAXBITS+VLCBITS-1)/VLCBITS) | ||
120 | #define VEC1MAXDEPTH ((HUFF_VEC1_MAXBITS+VLCBITS-1)/VLCBITS) | ||
121 | #define SCALEMAXDEPTH ((HUFF_SCALE_MAXBITS+SCALEVLCBITS-1)/SCALEVLCBITS) | ||
122 | #define SCALERLMAXDEPTH ((HUFF_SCALE_RL_MAXBITS+VLCBITS-1)/VLCBITS) | ||
123 | |||
124 | static VLC sf_vlc; ///< scale factor DPCM vlc | ||
125 | static VLC sf_rl_vlc; ///< scale factor run length vlc | ||
126 | static VLC vec4_vlc; ///< 4 coefficients per symbol | ||
127 | static VLC vec2_vlc; ///< 2 coefficients per symbol | ||
128 | static VLC vec1_vlc; ///< 1 coefficient per symbol | ||
129 | static VLC coef_vlc[2]; ///< coefficient run length vlc codes | ||
130 | static float sin64[33]; ///< sinus table for decorrelation | ||
131 | |||
132 | /** | ||
133 | * @brief frame specific decoder context for a single channel | ||
134 | */ | ||
135 | typedef struct { | ||
136 | int16_t prev_block_len; ///< length of the previous block | ||
137 | uint8_t transmit_coefs; | ||
138 | uint8_t num_subframes; | ||
139 | uint16_t subframe_len[MAX_SUBFRAMES]; ///< subframe length in samples | ||
140 | uint16_t subframe_offset[MAX_SUBFRAMES]; ///< subframe positions in the current frame | ||
141 | uint8_t cur_subframe; ///< current subframe number | ||
142 | uint16_t decoded_samples; ///< number of already processed samples | ||
143 | uint8_t grouped; ///< channel is part of a group | ||
144 | int quant_step; ///< quantization step for the current subframe | ||
145 | int8_t reuse_sf; ///< share scale factors between subframes | ||
146 | int8_t scale_factor_step; ///< scaling step for the current subframe | ||
147 | int max_scale_factor; ///< maximum scale factor for the current subframe | ||
148 | int saved_scale_factors[2][MAX_BANDS]; ///< resampled and (previously) transmitted scale factor values | ||
149 | int8_t scale_factor_idx; ///< index for the transmitted scale factor values (used for resampling) | ||
150 | int* scale_factors; ///< pointer to the scale factor values used for decoding | ||
151 | uint8_t table_idx; ///< index in sf_offsets for the scale factor reference block | ||
152 | float* coeffs; ///< pointer to the subframe decode buffer | ||
153 | DECLARE_ALIGNED(16, float, out)[WMAPRO_BLOCK_MAX_SIZE + WMAPRO_BLOCK_MAX_SIZE / 2]; ///< output buffer | ||
154 | } WMAProChannelCtx; | ||
155 | |||
156 | /** | ||
157 | * @brief channel group for channel transformations | ||
158 | */ | ||
159 | typedef struct { | ||
160 | uint8_t num_channels; ///< number of channels in the group | ||
161 | int8_t transform; ///< transform on / off | ||
162 | int8_t transform_band[MAX_BANDS]; ///< controls if the transform is enabled for a certain band | ||
163 | float decorrelation_matrix[WMAPRO_MAX_CHANNELS*WMAPRO_MAX_CHANNELS]; | ||
164 | float* channel_data[WMAPRO_MAX_CHANNELS]; ///< transformation coefficients | ||
165 | } WMAProChannelGrp; | ||
166 | |||
167 | /** | ||
168 | * @brief main decoder context | ||
169 | */ | ||
170 | typedef struct WMAProDecodeCtx { | ||
171 | /* generic decoder variables */ | ||
172 | AVCodecContext* avctx; ///< codec context for av_log | ||
173 | DSPContext dsp; ///< accelerated DSP functions | ||
174 | uint8_t frame_data[MAX_FRAMESIZE + | ||
175 | FF_INPUT_BUFFER_PADDING_SIZE];///< compressed frame data | ||
176 | PutBitContext pb; ///< context for filling the frame_data buffer | ||
177 | FFTContext mdct_ctx[WMAPRO_BLOCK_SIZES]; ///< MDCT context per block size | ||
178 | DECLARE_ALIGNED(16, float, tmp)[WMAPRO_BLOCK_MAX_SIZE]; ///< IMDCT output buffer | ||
179 | float* windows[WMAPRO_BLOCK_SIZES]; ///< windows for the different block sizes | ||
180 | |||
181 | /* frame size dependent frame information (set during initialization) */ | ||
182 | uint32_t decode_flags; ///< used compression features | ||
183 | uint8_t len_prefix; ///< frame is prefixed with its length | ||
184 | uint8_t dynamic_range_compression; ///< frame contains DRC data | ||
185 | uint8_t bits_per_sample; ///< integer audio sample size for the unscaled IMDCT output (used to scale to [-1.0, 1.0]) | ||
186 | uint16_t samples_per_frame; ///< number of samples to output | ||
187 | uint16_t log2_frame_size; | ||
188 | int8_t num_channels; ///< number of channels in the stream (same as AVCodecContext.num_channels) | ||
189 | int8_t lfe_channel; ///< lfe channel index | ||
190 | uint8_t max_num_subframes; | ||
191 | uint8_t subframe_len_bits; ///< number of bits used for the subframe length | ||
192 | uint8_t max_subframe_len_bit; ///< flag indicating that the subframe is of maximum size when the first subframe length bit is 1 | ||
193 | uint16_t min_samples_per_subframe; | ||
194 | int8_t num_sfb[WMAPRO_BLOCK_SIZES]; ///< scale factor bands per block size | ||
195 | int16_t sfb_offsets[WMAPRO_BLOCK_SIZES][MAX_BANDS]; ///< scale factor band offsets (multiples of 4) | ||
196 | int8_t sf_offsets[WMAPRO_BLOCK_SIZES][WMAPRO_BLOCK_SIZES][MAX_BANDS]; ///< scale factor resample matrix | ||
197 | int16_t subwoofer_cutoffs[WMAPRO_BLOCK_SIZES]; ///< subwoofer cutoff values | ||
198 | |||
199 | /* packet decode state */ | ||
200 | GetBitContext pgb; ///< bitstream reader context for the packet | ||
201 | uint8_t packet_offset; ///< frame offset in the packet | ||
202 | uint8_t packet_sequence_number; ///< current packet number | ||
203 | int num_saved_bits; ///< saved number of bits | ||
204 | int frame_offset; ///< frame offset in the bit reservoir | ||
205 | int subframe_offset; ///< subframe offset in the bit reservoir | ||
206 | uint8_t packet_loss; ///< set in case of bitstream error | ||
207 | uint8_t packet_done; ///< set when a packet is fully decoded | ||
208 | |||
209 | /* frame decode state */ | ||
210 | uint32_t frame_num; ///< current frame number (not used for decoding) | ||
211 | GetBitContext gb; ///< bitstream reader context | ||
212 | int buf_bit_size; ///< buffer size in bits | ||
213 | float* samples; ///< current samplebuffer pointer | ||
214 | float* samples_end; ///< maximum samplebuffer pointer | ||
215 | uint8_t drc_gain; ///< gain for the DRC tool | ||
216 | int8_t skip_frame; ///< skip output step | ||
217 | int8_t parsed_all_subframes; ///< all subframes decoded? | ||
218 | |||
219 | /* subframe/block decode state */ | ||
220 | int16_t subframe_len; ///< current subframe length | ||
221 | int8_t channels_for_cur_subframe; ///< number of channels that contain the subframe | ||
222 | int8_t channel_indexes_for_cur_subframe[WMAPRO_MAX_CHANNELS]; | ||
223 | int8_t num_bands; ///< number of scale factor bands | ||
224 | int16_t* cur_sfb_offsets; ///< sfb offsets for the current block | ||
225 | uint8_t table_idx; ///< index for the num_sfb, sfb_offsets, sf_offsets and subwoofer_cutoffs tables | ||
226 | int8_t esc_len; ///< length of escaped coefficients | ||
227 | |||
228 | uint8_t num_chgroups; ///< number of channel groups | ||
229 | WMAProChannelGrp chgroup[WMAPRO_MAX_CHANNELS]; ///< channel group information | ||
230 | |||
231 | WMAProChannelCtx channel[WMAPRO_MAX_CHANNELS]; ///< per channel data | ||
232 | } WMAProDecodeCtx; | ||
233 | |||
234 | |||
235 | /** | ||
236 | *@brief helper function to print the most important members of the context | ||
237 | *@param s context | ||
238 | */ | ||
239 | static void av_cold dump_context(WMAProDecodeCtx *s) | ||
240 | { | ||
241 | #define PRINT(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %d\n", a, b); | ||
242 | #define PRINT_HEX(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %x\n", a, b); | ||
243 | |||
244 | PRINT("ed sample bit depth", s->bits_per_sample); | ||
245 | PRINT_HEX("ed decode flags", s->decode_flags); | ||
246 | PRINT("samples per frame", s->samples_per_frame); | ||
247 | PRINT("log2 frame size", s->log2_frame_size); | ||
248 | PRINT("max num subframes", s->max_num_subframes); | ||
249 | PRINT("len prefix", s->len_prefix); | ||
250 | PRINT("num channels", s->num_channels); | ||
251 | } | ||
252 | |||
253 | /** | ||
254 | *@brief Uninitialize the decoder and free all resources. | ||
255 | *@param avctx codec context | ||
256 | *@return 0 on success, < 0 otherwise | ||
257 | */ | ||
258 | static av_cold int decode_end(AVCodecContext *avctx) | ||
259 | { | ||
260 | WMAProDecodeCtx *s = avctx->priv_data; | ||
261 | int i; | ||
262 | |||
263 | for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) | ||
264 | ff_mdct_end(&s->mdct_ctx[i]); | ||
265 | |||
266 | return 0; | ||
267 | } | ||
268 | |||
269 | /** | ||
270 | *@brief Initialize the decoder. | ||
271 | *@param avctx codec context | ||
272 | *@return 0 on success, -1 otherwise | ||
273 | */ | ||
274 | static av_cold int decode_init(AVCodecContext *avctx) | ||
275 | { | ||
276 | WMAProDecodeCtx *s = avctx->priv_data; | ||
277 | uint8_t *edata_ptr = avctx->extradata; | ||
278 | unsigned int channel_mask; | ||
279 | int i; | ||
280 | int log2_max_num_subframes; | ||
281 | int num_possible_block_sizes; | ||
282 | |||
283 | s->avctx = avctx; | ||
284 | dsputil_init(&s->dsp, avctx); | ||
285 | init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE); | ||
286 | |||
287 | avctx->sample_fmt = SAMPLE_FMT_FLT; | ||
288 | |||
289 | if (avctx->extradata_size >= 18) { | ||
290 | s->decode_flags = AV_RL16(edata_ptr+14); | ||
291 | channel_mask = AV_RL32(edata_ptr+2); | ||
292 | s->bits_per_sample = AV_RL16(edata_ptr); | ||
293 | /** dump the extradata */ | ||
294 | for (i = 0; i < avctx->extradata_size; i++) | ||
295 | dprintf(avctx, "[%x] ", avctx->extradata[i]); | ||
296 | dprintf(avctx, "\n"); | ||
297 | |||
298 | } else { | ||
299 | av_log_ask_for_sample(avctx, "Unknown extradata size\n"); | ||
300 | return AVERROR_INVALIDDATA; | ||
301 | } | ||
302 | |||
303 | /** generic init */ | ||
304 | s->log2_frame_size = av_log2(avctx->block_align) + 4; | ||
305 | |||
306 | /** frame info */ | ||
307 | s->skip_frame = 1; /** skip first frame */ | ||
308 | s->packet_loss = 1; | ||
309 | s->len_prefix = (s->decode_flags & 0x40); | ||
310 | |||
311 | if (!s->len_prefix) { | ||
312 | av_log_ask_for_sample(avctx, "no length prefix\n"); | ||
313 | return AVERROR_INVALIDDATA; | ||
314 | } | ||
315 | |||
316 | /** get frame len */ | ||
317 | s->samples_per_frame = 1 << ff_wma_get_frame_len_bits(avctx->sample_rate, | ||
318 | 3, s->decode_flags); | ||
319 | |||
320 | /** init previous block len */ | ||
321 | for (i = 0; i < avctx->channels; i++) | ||
322 | s->channel[i].prev_block_len = s->samples_per_frame; | ||
323 | |||
324 | /** subframe info */ | ||
325 | log2_max_num_subframes = ((s->decode_flags & 0x38) >> 3); | ||
326 | s->max_num_subframes = 1 << log2_max_num_subframes; | ||
327 | if (s->max_num_subframes == 16) | ||
328 | s->max_subframe_len_bit = 1; | ||
329 | s->subframe_len_bits = av_log2(log2_max_num_subframes) + 1; | ||
330 | |||
331 | num_possible_block_sizes = log2_max_num_subframes + 1; | ||
332 | s->min_samples_per_subframe = s->samples_per_frame / s->max_num_subframes; | ||
333 | s->dynamic_range_compression = (s->decode_flags & 0x80); | ||
334 | |||
335 | if (s->max_num_subframes > MAX_SUBFRAMES) { | ||
336 | av_log(avctx, AV_LOG_ERROR, "invalid number of subframes %i\n", | ||
337 | s->max_num_subframes); | ||
338 | return AVERROR_INVALIDDATA; | ||
339 | } | ||
340 | |||
341 | s->num_channels = avctx->channels; | ||
342 | |||
343 | /** extract lfe channel position */ | ||
344 | s->lfe_channel = -1; | ||
345 | |||
346 | if (channel_mask & 8) { | ||
347 | unsigned int mask; | ||
348 | for (mask = 1; mask < 16; mask <<= 1) { | ||
349 | if (channel_mask & mask) | ||
350 | ++s->lfe_channel; | ||
351 | } | ||
352 | } | ||
353 | |||
354 | if (s->num_channels < 0) { | ||
355 | av_log(avctx, AV_LOG_ERROR, "invalid number of channels %d\n", s->num_channels); | ||
356 | return AVERROR_INVALIDDATA; | ||
357 | } else if (s->num_channels > WMAPRO_MAX_CHANNELS) { | ||
358 | av_log_ask_for_sample(avctx, "unsupported number of channels\n"); | ||
359 | return AVERROR_PATCHWELCOME; | ||
360 | } | ||
361 | |||
362 | INIT_VLC_STATIC(&sf_vlc, SCALEVLCBITS, HUFF_SCALE_SIZE, | ||
363 | scale_huffbits, 1, 1, | ||
364 | scale_huffcodes, 2, 2, 616); | ||
365 | |||
366 | INIT_VLC_STATIC(&sf_rl_vlc, VLCBITS, HUFF_SCALE_RL_SIZE, | ||
367 | scale_rl_huffbits, 1, 1, | ||
368 | scale_rl_huffcodes, 4, 4, 1406); | ||
369 | |||
370 | INIT_VLC_STATIC(&coef_vlc[0], VLCBITS, HUFF_COEF0_SIZE, | ||
371 | coef0_huffbits, 1, 1, | ||
372 | coef0_huffcodes, 4, 4, 2108); | ||
373 | |||
374 | INIT_VLC_STATIC(&coef_vlc[1], VLCBITS, HUFF_COEF1_SIZE, | ||
375 | coef1_huffbits, 1, 1, | ||
376 | coef1_huffcodes, 4, 4, 3912); | ||
377 | |||
378 | INIT_VLC_STATIC(&vec4_vlc, VLCBITS, HUFF_VEC4_SIZE, | ||
379 | vec4_huffbits, 1, 1, | ||
380 | vec4_huffcodes, 2, 2, 604); | ||
381 | |||
382 | INIT_VLC_STATIC(&vec2_vlc, VLCBITS, HUFF_VEC2_SIZE, | ||
383 | vec2_huffbits, 1, 1, | ||
384 | vec2_huffcodes, 2, 2, 562); | ||
385 | |||
386 | INIT_VLC_STATIC(&vec1_vlc, VLCBITS, HUFF_VEC1_SIZE, | ||
387 | vec1_huffbits, 1, 1, | ||
388 | vec1_huffcodes, 2, 2, 562); | ||
389 | |||
390 | /** calculate number of scale factor bands and their offsets | ||
391 | for every possible block size */ | ||
392 | for (i = 0; i < num_possible_block_sizes; i++) { | ||
393 | int subframe_len = s->samples_per_frame >> i; | ||
394 | int x; | ||
395 | int band = 1; | ||
396 | |||
397 | s->sfb_offsets[i][0] = 0; | ||
398 | |||
399 | for (x = 0; x < MAX_BANDS-1 && s->sfb_offsets[i][band - 1] < subframe_len; x++) { | ||
400 | int offset = (subframe_len * 2 * critical_freq[x]) | ||
401 | / s->avctx->sample_rate + 2; | ||
402 | offset &= ~3; | ||
403 | if (offset > s->sfb_offsets[i][band - 1]) | ||
404 | s->sfb_offsets[i][band++] = offset; | ||
405 | } | ||
406 | s->sfb_offsets[i][band - 1] = subframe_len; | ||
407 | s->num_sfb[i] = band - 1; | ||
408 | } | ||
409 | |||
410 | |||
411 | /** Scale factors can be shared between blocks of different size | ||
412 | as every block has a different scale factor band layout. | ||
413 | The matrix sf_offsets is needed to find the correct scale factor. | ||
414 | */ | ||
415 | |||
416 | for (i = 0; i < num_possible_block_sizes; i++) { | ||
417 | int b; | ||
418 | for (b = 0; b < s->num_sfb[i]; b++) { | ||
419 | int x; | ||
420 | int offset = ((s->sfb_offsets[i][b] | ||
421 | + s->sfb_offsets[i][b + 1] - 1) << i) >> 1; | ||
422 | for (x = 0; x < num_possible_block_sizes; x++) { | ||
423 | int v = 0; | ||
424 | while (s->sfb_offsets[x][v + 1] << x < offset) | ||
425 | ++v; | ||
426 | s->sf_offsets[i][x][b] = v; | ||
427 | } | ||
428 | } | ||
429 | } | ||
430 | |||
431 | /** init MDCT, FIXME: only init needed sizes */ | ||
432 | for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) | ||
433 | ff_mdct_init(&s->mdct_ctx[i], BLOCK_MIN_BITS+1+i, 1, | ||
434 | 1.0 / (1 << (BLOCK_MIN_BITS + i - 1)) | ||
435 | / (1 << (s->bits_per_sample - 1))); | ||
436 | |||
437 | /** init MDCT windows: simple sinus window */ | ||
438 | for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) { | ||
439 | const int win_idx = WMAPRO_BLOCK_MAX_BITS - i; | ||
440 | ff_init_ff_sine_windows(win_idx); | ||
441 | s->windows[WMAPRO_BLOCK_SIZES - i - 1] = ff_sine_windows[win_idx]; | ||
442 | } | ||
443 | |||
444 | /** calculate subwoofer cutoff values */ | ||
445 | for (i = 0; i < num_possible_block_sizes; i++) { | ||
446 | int block_size = s->samples_per_frame >> i; | ||
447 | int cutoff = (440*block_size + 3 * (s->avctx->sample_rate >> 1) - 1) | ||
448 | / s->avctx->sample_rate; | ||
449 | s->subwoofer_cutoffs[i] = av_clip(cutoff, 4, block_size); | ||
450 | } | ||
451 | |||
452 | /** calculate sine values for the decorrelation matrix */ | ||
453 | for (i = 0; i < 33; i++) | ||
454 | sin64[i] = sin(i*M_PI / 64.0); | ||
455 | #if 0 | ||
456 | if (avctx->debug & FF_DEBUG_BITSTREAM) | ||
457 | dump_context(s); | ||
458 | #endif | ||
459 | |||
460 | avctx->channel_layout = channel_mask; | ||
461 | return 0; | ||
462 | } | ||
463 | |||
464 | /** | ||
465 | *@brief Decode the subframe length. | ||
466 | *@param s context | ||
467 | *@param offset sample offset in the frame | ||
468 | *@return decoded subframe length on success, < 0 in case of an error | ||
469 | */ | ||
470 | static int decode_subframe_length(WMAProDecodeCtx *s, int offset) | ||
471 | { | ||
472 | int frame_len_shift = 0; | ||
473 | int subframe_len; | ||
474 | |||
475 | /** no need to read from the bitstream when only one length is possible */ | ||
476 | if (offset == s->samples_per_frame - s->min_samples_per_subframe) | ||
477 | return s->min_samples_per_subframe; | ||
478 | |||
479 | /** 1 bit indicates if the subframe is of maximum length */ | ||
480 | if (s->max_subframe_len_bit) { | ||
481 | if (get_bits1(&s->gb)) | ||
482 | frame_len_shift = 1 + get_bits(&s->gb, s->subframe_len_bits-1); | ||
483 | } else | ||
484 | frame_len_shift = get_bits(&s->gb, s->subframe_len_bits); | ||
485 | |||
486 | subframe_len = s->samples_per_frame >> frame_len_shift; | ||
487 | |||
488 | /** sanity check the length */ | ||
489 | if (subframe_len < s->min_samples_per_subframe || | ||
490 | subframe_len > s->samples_per_frame) { | ||
491 | av_log(s->avctx, AV_LOG_ERROR, "broken frame: subframe_len %i\n", | ||
492 | subframe_len); | ||
493 | return AVERROR_INVALIDDATA; | ||
494 | } | ||
495 | return subframe_len; | ||
496 | } | ||
497 | |||
498 | /** | ||
499 | *@brief Decode how the data in the frame is split into subframes. | ||
500 | * Every WMA frame contains the encoded data for a fixed number of | ||
501 | * samples per channel. The data for every channel might be split | ||
502 | * into several subframes. This function will reconstruct the list of | ||
503 | * subframes for every channel. | ||
504 | * | ||
505 | * If the subframes are not evenly split, the algorithm estimates the | ||
506 | * channels with the lowest number of total samples. | ||
507 | * Afterwards, for each of these channels a bit is read from the | ||
508 | * bitstream that indicates if the channel contains a subframe with the | ||
509 | * next subframe size that is going to be read from the bitstream or not. | ||
510 | * If a channel contains such a subframe, the subframe size gets added to | ||
511 | * the channel's subframe list. | ||
512 | * The algorithm repeats these steps until the frame is properly divided | ||
513 | * between the individual channels. | ||
514 | * | ||
515 | *@param s context | ||
516 | *@return 0 on success, < 0 in case of an error | ||
517 | */ | ||
518 | static int decode_tilehdr(WMAProDecodeCtx *s) | ||
519 | { | ||
520 | uint16_t num_samples[WMAPRO_MAX_CHANNELS]; /** sum of samples for all currently known subframes of a channel */ | ||
521 | uint8_t contains_subframe[WMAPRO_MAX_CHANNELS]; /** flag indicating if a channel contains the current subframe */ | ||
522 | int channels_for_cur_subframe = s->num_channels; /** number of channels that contain the current subframe */ | ||
523 | int fixed_channel_layout = 0; /** flag indicating that all channels use the same subframe offsets and sizes */ | ||
524 | int min_channel_len = 0; /** smallest sum of samples (channels with this length will be processed first) */ | ||
525 | int c; | ||
526 | |||
527 | /* Should never consume more than 3073 bits (256 iterations for the | ||
528 | * while loop when always the minimum amount of 128 samples is substracted | ||
529 | * from missing samples in the 8 channel case). | ||
530 | * 1 + BLOCK_MAX_SIZE * MAX_CHANNELS / BLOCK_MIN_SIZE * (MAX_CHANNELS + 4) | ||
531 | */ | ||
532 | |||
533 | /** reset tiling information */ | ||
534 | for (c = 0; c < s->num_channels; c++) | ||
535 | s->channel[c].num_subframes = 0; | ||
536 | |||
537 | memset(num_samples, 0, sizeof(num_samples)); | ||
538 | |||
539 | if (s->max_num_subframes == 1 || get_bits1(&s->gb)) | ||
540 | fixed_channel_layout = 1; | ||
541 | |||
542 | /** loop until the frame data is split between the subframes */ | ||
543 | do { | ||
544 | int subframe_len; | ||
545 | |||
546 | /** check which channels contain the subframe */ | ||
547 | for (c = 0; c < s->num_channels; c++) { | ||
548 | if (num_samples[c] == min_channel_len) { | ||
549 | if (fixed_channel_layout || channels_for_cur_subframe == 1 || | ||
550 | (min_channel_len == s->samples_per_frame - s->min_samples_per_subframe)) | ||
551 | contains_subframe[c] = 1; | ||
552 | else | ||
553 | contains_subframe[c] = get_bits1(&s->gb); | ||
554 | } else | ||
555 | contains_subframe[c] = 0; | ||
556 | } | ||
557 | |||
558 | /** get subframe length, subframe_len == 0 is not allowed */ | ||
559 | if ((subframe_len = decode_subframe_length(s, min_channel_len)) <= 0) | ||
560 | return AVERROR_INVALIDDATA; | ||
561 | |||
562 | /** add subframes to the individual channels and find new min_channel_len */ | ||
563 | min_channel_len += subframe_len; | ||
564 | for (c = 0; c < s->num_channels; c++) { | ||
565 | WMAProChannelCtx* chan = &s->channel[c]; | ||
566 | |||
567 | if (contains_subframe[c]) { | ||
568 | if (chan->num_subframes >= MAX_SUBFRAMES) { | ||
569 | av_log(s->avctx, AV_LOG_ERROR, | ||
570 | "broken frame: num subframes > 31\n"); | ||
571 | return AVERROR_INVALIDDATA; | ||
572 | } | ||
573 | chan->subframe_len[chan->num_subframes] = subframe_len; | ||
574 | num_samples[c] += subframe_len; | ||
575 | ++chan->num_subframes; | ||
576 | if (num_samples[c] > s->samples_per_frame) { | ||
577 | av_log(s->avctx, AV_LOG_ERROR, "broken frame: " | ||
578 | "channel len > samples_per_frame\n"); | ||
579 | return AVERROR_INVALIDDATA; | ||
580 | } | ||
581 | } else if (num_samples[c] <= min_channel_len) { | ||
582 | if (num_samples[c] < min_channel_len) { | ||
583 | channels_for_cur_subframe = 0; | ||
584 | min_channel_len = num_samples[c]; | ||
585 | } | ||
586 | ++channels_for_cur_subframe; | ||
587 | } | ||
588 | } | ||
589 | } while (min_channel_len < s->samples_per_frame); | ||
590 | |||
591 | for (c = 0; c < s->num_channels; c++) { | ||
592 | int i; | ||
593 | int offset = 0; | ||
594 | for (i = 0; i < s->channel[c].num_subframes; i++) { | ||
595 | dprintf(s->avctx, "frame[%i] channel[%i] subframe[%i]" | ||
596 | " len %i\n", s->frame_num, c, i, | ||
597 | s->channel[c].subframe_len[i]); | ||
598 | s->channel[c].subframe_offset[i] = offset; | ||
599 | offset += s->channel[c].subframe_len[i]; | ||
600 | } | ||
601 | } | ||
602 | |||
603 | return 0; | ||
604 | } | ||
605 | |||
606 | /** | ||
607 | *@brief Calculate a decorrelation matrix from the bitstream parameters. | ||
608 | *@param s codec context | ||
609 | *@param chgroup channel group for which the matrix needs to be calculated | ||
610 | */ | ||
611 | static void decode_decorrelation_matrix(WMAProDecodeCtx *s, | ||
612 | WMAProChannelGrp *chgroup) | ||
613 | { | ||
614 | int i; | ||
615 | int offset = 0; | ||
616 | int8_t rotation_offset[WMAPRO_MAX_CHANNELS * WMAPRO_MAX_CHANNELS]; | ||
617 | memset(chgroup->decorrelation_matrix, 0, s->num_channels * | ||
618 | s->num_channels * sizeof(*chgroup->decorrelation_matrix)); | ||
619 | |||
620 | for (i = 0; i < chgroup->num_channels * (chgroup->num_channels - 1) >> 1; i++) | ||
621 | rotation_offset[i] = get_bits(&s->gb, 6); | ||
622 | |||
623 | for (i = 0; i < chgroup->num_channels; i++) | ||
624 | chgroup->decorrelation_matrix[chgroup->num_channels * i + i] = | ||
625 | get_bits1(&s->gb) ? 1.0 : -1.0; | ||
626 | |||
627 | for (i = 1; i < chgroup->num_channels; i++) { | ||
628 | int x; | ||
629 | for (x = 0; x < i; x++) { | ||
630 | int y; | ||
631 | for (y = 0; y < i + 1; y++) { | ||
632 | float v1 = chgroup->decorrelation_matrix[x * chgroup->num_channels + y]; | ||
633 | float v2 = chgroup->decorrelation_matrix[i * chgroup->num_channels + y]; | ||
634 | int n = rotation_offset[offset + x]; | ||
635 | float sinv; | ||
636 | float cosv; | ||
637 | |||
638 | if (n < 32) { | ||
639 | sinv = sin64[n]; | ||
640 | cosv = sin64[32 - n]; | ||
641 | } else { | ||
642 | sinv = sin64[64 - n]; | ||
643 | cosv = -sin64[n - 32]; | ||
644 | } | ||
645 | |||
646 | chgroup->decorrelation_matrix[y + x * chgroup->num_channels] = | ||
647 | (v1 * sinv) - (v2 * cosv); | ||
648 | chgroup->decorrelation_matrix[y + i * chgroup->num_channels] = | ||
649 | (v1 * cosv) + (v2 * sinv); | ||
650 | } | ||
651 | } | ||
652 | offset += i; | ||
653 | } | ||
654 | } | ||
655 | |||
656 | /** | ||
657 | *@brief Decode channel transformation parameters | ||
658 | *@param s codec context | ||
659 | *@return 0 in case of success, < 0 in case of bitstream errors | ||
660 | */ | ||
661 | static int decode_channel_transform(WMAProDecodeCtx* s) | ||
662 | { | ||
663 | int i; | ||
664 | /* should never consume more than 1921 bits for the 8 channel case | ||
665 | * 1 + MAX_CHANNELS * (MAX_CHANNELS + 2 + 3 * MAX_CHANNELS * MAX_CHANNELS | ||
666 | * + MAX_CHANNELS + MAX_BANDS + 1) | ||
667 | */ | ||
668 | |||
669 | /** in the one channel case channel transforms are pointless */ | ||
670 | s->num_chgroups = 0; | ||
671 | if (s->num_channels > 1) { | ||
672 | int remaining_channels = s->channels_for_cur_subframe; | ||
673 | |||
674 | if (get_bits1(&s->gb)) { | ||
675 | av_log_ask_for_sample(s->avctx, | ||
676 | "unsupported channel transform bit\n"); | ||
677 | return AVERROR_INVALIDDATA; | ||
678 | } | ||
679 | |||
680 | for (s->num_chgroups = 0; remaining_channels && | ||
681 | s->num_chgroups < s->channels_for_cur_subframe; s->num_chgroups++) { | ||
682 | WMAProChannelGrp* chgroup = &s->chgroup[s->num_chgroups]; | ||
683 | float** channel_data = chgroup->channel_data; | ||
684 | chgroup->num_channels = 0; | ||
685 | chgroup->transform = 0; | ||
686 | |||
687 | /** decode channel mask */ | ||
688 | if (remaining_channels > 2) { | ||
689 | for (i = 0; i < s->channels_for_cur_subframe; i++) { | ||
690 | int channel_idx = s->channel_indexes_for_cur_subframe[i]; | ||
691 | if (!s->channel[channel_idx].grouped | ||
692 | && get_bits1(&s->gb)) { | ||
693 | ++chgroup->num_channels; | ||
694 | s->channel[channel_idx].grouped = 1; | ||
695 | *channel_data++ = s->channel[channel_idx].coeffs; | ||
696 | } | ||
697 | } | ||
698 | } else { | ||
699 | chgroup->num_channels = remaining_channels; | ||
700 | for (i = 0; i < s->channels_for_cur_subframe; i++) { | ||
701 | int channel_idx = s->channel_indexes_for_cur_subframe[i]; | ||
702 | if (!s->channel[channel_idx].grouped) | ||
703 | *channel_data++ = s->channel[channel_idx].coeffs; | ||
704 | s->channel[channel_idx].grouped = 1; | ||
705 | } | ||
706 | } | ||
707 | |||
708 | /** decode transform type */ | ||
709 | if (chgroup->num_channels == 2) { | ||
710 | if (get_bits1(&s->gb)) { | ||
711 | if (get_bits1(&s->gb)) { | ||
712 | av_log_ask_for_sample(s->avctx, | ||
713 | "unsupported channel transform type\n"); | ||
714 | } | ||
715 | } else { | ||
716 | chgroup->transform = 1; | ||
717 | if (s->num_channels == 2) { | ||
718 | chgroup->decorrelation_matrix[0] = 1.0; | ||
719 | chgroup->decorrelation_matrix[1] = -1.0; | ||
720 | chgroup->decorrelation_matrix[2] = 1.0; | ||
721 | chgroup->decorrelation_matrix[3] = 1.0; | ||
722 | } else { | ||
723 | /** cos(pi/4) */ | ||
724 | chgroup->decorrelation_matrix[0] = 0.70703125; | ||
725 | chgroup->decorrelation_matrix[1] = -0.70703125; | ||
726 | chgroup->decorrelation_matrix[2] = 0.70703125; | ||
727 | chgroup->decorrelation_matrix[3] = 0.70703125; | ||
728 | } | ||
729 | } | ||
730 | } else if (chgroup->num_channels > 2) { | ||
731 | if (get_bits1(&s->gb)) { | ||
732 | chgroup->transform = 1; | ||
733 | if (get_bits1(&s->gb)) { | ||
734 | decode_decorrelation_matrix(s, chgroup); | ||
735 | } else { | ||
736 | /** FIXME: more than 6 coupled channels not supported */ | ||
737 | if (chgroup->num_channels > 6) { | ||
738 | av_log_ask_for_sample(s->avctx, | ||
739 | "coupled channels > 6\n"); | ||
740 | } else { | ||
741 | memcpy(chgroup->decorrelation_matrix, | ||
742 | default_decorrelation[chgroup->num_channels], | ||
743 | chgroup->num_channels * chgroup->num_channels * | ||
744 | sizeof(*chgroup->decorrelation_matrix)); | ||
745 | } | ||
746 | } | ||
747 | } | ||
748 | } | ||
749 | |||
750 | /** decode transform on / off */ | ||
751 | if (chgroup->transform) { | ||
752 | if (!get_bits1(&s->gb)) { | ||
753 | int i; | ||
754 | /** transform can be enabled for individual bands */ | ||
755 | for (i = 0; i < s->num_bands; i++) { | ||
756 | chgroup->transform_band[i] = get_bits1(&s->gb); | ||
757 | } | ||
758 | } else { | ||
759 | memset(chgroup->transform_band, 1, s->num_bands); | ||
760 | } | ||
761 | } | ||
762 | remaining_channels -= chgroup->num_channels; | ||
763 | } | ||
764 | } | ||
765 | return 0; | ||
766 | } | ||
767 | |||
768 | /** | ||
769 | *@brief Extract the coefficients from the bitstream. | ||
770 | *@param s codec context | ||
771 | *@param c current channel number | ||
772 | *@return 0 on success, < 0 in case of bitstream errors | ||
773 | */ | ||
774 | static int decode_coeffs(WMAProDecodeCtx *s, int c) | ||
775 | { | ||
776 | /* Integers 0..15 as single-precision floats. The table saves a | ||
777 | costly int to float conversion, and storing the values as | ||
778 | integers allows fast sign-flipping. */ | ||
779 | static const int fval_tab[16] = { | ||
780 | 0x00000000, 0x3f800000, 0x40000000, 0x40400000, | ||
781 | 0x40800000, 0x40a00000, 0x40c00000, 0x40e00000, | ||
782 | 0x41000000, 0x41100000, 0x41200000, 0x41300000, | ||
783 | 0x41400000, 0x41500000, 0x41600000, 0x41700000, | ||
784 | }; | ||
785 | int vlctable; | ||
786 | VLC* vlc; | ||
787 | WMAProChannelCtx* ci = &s->channel[c]; | ||
788 | int rl_mode = 0; | ||
789 | int cur_coeff = 0; | ||
790 | int num_zeros = 0; | ||
791 | const uint16_t* run; | ||
792 | const float* level; | ||
793 | |||
794 | dprintf(s->avctx, "decode coefficients for channel %i\n", c); | ||
795 | |||
796 | vlctable = get_bits1(&s->gb); | ||
797 | vlc = &coef_vlc[vlctable]; | ||
798 | |||
799 | if (vlctable) { | ||
800 | run = coef1_run; | ||
801 | level = coef1_level; | ||
802 | } else { | ||
803 | run = coef0_run; | ||
804 | level = coef0_level; | ||
805 | } | ||
806 | |||
807 | /** decode vector coefficients (consumes up to 167 bits per iteration for | ||
808 | 4 vector coded large values) */ | ||
809 | while (!rl_mode && cur_coeff + 3 < s->subframe_len) { | ||
810 | int vals[4]; | ||
811 | int i; | ||
812 | unsigned int idx; | ||
813 | |||
814 | idx = get_vlc2(&s->gb, vec4_vlc.table, VLCBITS, VEC4MAXDEPTH); | ||
815 | |||
816 | if (idx == HUFF_VEC4_SIZE - 1) { | ||
817 | for (i = 0; i < 4; i += 2) { | ||
818 | idx = get_vlc2(&s->gb, vec2_vlc.table, VLCBITS, VEC2MAXDEPTH); | ||
819 | if (idx == HUFF_VEC2_SIZE - 1) { | ||
820 | int v0, v1; | ||
821 | v0 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH); | ||
822 | if (v0 == HUFF_VEC1_SIZE - 1) | ||
823 | v0 += ff_wma_get_large_val(&s->gb); | ||
824 | v1 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH); | ||
825 | if (v1 == HUFF_VEC1_SIZE - 1) | ||
826 | v1 += ff_wma_get_large_val(&s->gb); | ||
827 | ((float*)vals)[i ] = v0; | ||
828 | ((float*)vals)[i+1] = v1; | ||
829 | } else { | ||
830 | vals[i] = fval_tab[symbol_to_vec2[idx] >> 4 ]; | ||
831 | vals[i+1] = fval_tab[symbol_to_vec2[idx] & 0xF]; | ||
832 | } | ||
833 | } | ||
834 | } else { | ||
835 | vals[0] = fval_tab[ symbol_to_vec4[idx] >> 12 ]; | ||
836 | vals[1] = fval_tab[(symbol_to_vec4[idx] >> 8) & 0xF]; | ||
837 | vals[2] = fval_tab[(symbol_to_vec4[idx] >> 4) & 0xF]; | ||
838 | vals[3] = fval_tab[ symbol_to_vec4[idx] & 0xF]; | ||
839 | } | ||
840 | |||
841 | /** decode sign */ | ||
842 | for (i = 0; i < 4; i++) { | ||
843 | if (vals[i]) { | ||
844 | int sign = get_bits1(&s->gb) - 1; | ||
845 | *(uint32_t*)&ci->coeffs[cur_coeff] = vals[i] ^ sign<<31; | ||
846 | num_zeros = 0; | ||
847 | } else { | ||
848 | ci->coeffs[cur_coeff] = 0; | ||
849 | /** switch to run level mode when subframe_len / 128 zeros | ||
850 | were found in a row */ | ||
851 | rl_mode |= (++num_zeros > s->subframe_len >> 8); | ||
852 | } | ||
853 | ++cur_coeff; | ||
854 | } | ||
855 | } | ||
856 | |||
857 | /** decode run level coded coefficients */ | ||
858 | if (rl_mode) { | ||
859 | memset(&ci->coeffs[cur_coeff], 0, | ||
860 | sizeof(*ci->coeffs) * (s->subframe_len - cur_coeff)); | ||
861 | if (ff_wma_run_level_decode(s->avctx, &s->gb, vlc, | ||
862 | level, run, 1, ci->coeffs, | ||
863 | cur_coeff, s->subframe_len, | ||
864 | s->subframe_len, s->esc_len, 0)) | ||
865 | return AVERROR_INVALIDDATA; | ||
866 | } | ||
867 | |||
868 | return 0; | ||
869 | } | ||
870 | |||
871 | /** | ||
872 | *@brief Extract scale factors from the bitstream. | ||
873 | *@param s codec context | ||
874 | *@return 0 on success, < 0 in case of bitstream errors | ||
875 | */ | ||
876 | static int decode_scale_factors(WMAProDecodeCtx* s) | ||
877 | { | ||
878 | int i; | ||
879 | |||
880 | /** should never consume more than 5344 bits | ||
881 | * MAX_CHANNELS * (1 + MAX_BANDS * 23) | ||
882 | */ | ||
883 | |||
884 | for (i = 0; i < s->channels_for_cur_subframe; i++) { | ||
885 | int c = s->channel_indexes_for_cur_subframe[i]; | ||
886 | int* sf; | ||
887 | int* sf_end; | ||
888 | s->channel[c].scale_factors = s->channel[c].saved_scale_factors[!s->channel[c].scale_factor_idx]; | ||
889 | sf_end = s->channel[c].scale_factors + s->num_bands; | ||
890 | |||
891 | /** resample scale factors for the new block size | ||
892 | * as the scale factors might need to be resampled several times | ||
893 | * before some new values are transmitted, a backup of the last | ||
894 | * transmitted scale factors is kept in saved_scale_factors | ||
895 | */ | ||
896 | if (s->channel[c].reuse_sf) { | ||
897 | const int8_t* sf_offsets = s->sf_offsets[s->table_idx][s->channel[c].table_idx]; | ||
898 | int b; | ||
899 | for (b = 0; b < s->num_bands; b++) | ||
900 | s->channel[c].scale_factors[b] = | ||
901 | s->channel[c].saved_scale_factors[s->channel[c].scale_factor_idx][*sf_offsets++]; | ||
902 | } | ||
903 | |||
904 | if (!s->channel[c].cur_subframe || get_bits1(&s->gb)) { | ||
905 | |||
906 | if (!s->channel[c].reuse_sf) { | ||
907 | int val; | ||
908 | /** decode DPCM coded scale factors */ | ||
909 | s->channel[c].scale_factor_step = get_bits(&s->gb, 2) + 1; | ||
910 | val = 45 / s->channel[c].scale_factor_step; | ||
911 | for (sf = s->channel[c].scale_factors; sf < sf_end; sf++) { | ||
912 | val += get_vlc2(&s->gb, sf_vlc.table, SCALEVLCBITS, SCALEMAXDEPTH) - 60; | ||
913 | *sf = val; | ||
914 | } | ||
915 | } else { | ||
916 | int i; | ||
917 | /** run level decode differences to the resampled factors */ | ||
918 | for (i = 0; i < s->num_bands; i++) { | ||
919 | int idx; | ||
920 | int skip; | ||
921 | int val; | ||
922 | int sign; | ||
923 | |||
924 | idx = get_vlc2(&s->gb, sf_rl_vlc.table, VLCBITS, SCALERLMAXDEPTH); | ||
925 | |||
926 | if (!idx) { | ||
927 | uint32_t code = get_bits(&s->gb, 14); | ||
928 | val = code >> 6; | ||
929 | sign = (code & 1) - 1; | ||
930 | skip = (code & 0x3f) >> 1; | ||
931 | } else if (idx == 1) { | ||
932 | break; | ||
933 | } else { | ||
934 | skip = scale_rl_run[idx]; | ||
935 | val = scale_rl_level[idx]; | ||
936 | sign = get_bits1(&s->gb)-1; | ||
937 | } | ||
938 | |||
939 | i += skip; | ||
940 | if (i >= s->num_bands) { | ||
941 | av_log(s->avctx, AV_LOG_ERROR, | ||
942 | "invalid scale factor coding\n"); | ||
943 | return AVERROR_INVALIDDATA; | ||
944 | } | ||
945 | s->channel[c].scale_factors[i] += (val ^ sign) - sign; | ||
946 | } | ||
947 | } | ||
948 | /** swap buffers */ | ||
949 | s->channel[c].scale_factor_idx = !s->channel[c].scale_factor_idx; | ||
950 | s->channel[c].table_idx = s->table_idx; | ||
951 | s->channel[c].reuse_sf = 1; | ||
952 | } | ||
953 | |||
954 | /** calculate new scale factor maximum */ | ||
955 | s->channel[c].max_scale_factor = s->channel[c].scale_factors[0]; | ||
956 | for (sf = s->channel[c].scale_factors + 1; sf < sf_end; sf++) { | ||
957 | s->channel[c].max_scale_factor = | ||
958 | FFMAX(s->channel[c].max_scale_factor, *sf); | ||
959 | } | ||
960 | |||
961 | } | ||
962 | return 0; | ||
963 | } | ||
964 | |||
965 | /** | ||
966 | *@brief Reconstruct the individual channel data. | ||
967 | *@param s codec context | ||
968 | */ | ||
969 | static void inverse_channel_transform(WMAProDecodeCtx *s) | ||
970 | { | ||
971 | int i; | ||
972 | |||
973 | for (i = 0; i < s->num_chgroups; i++) { | ||
974 | if (s->chgroup[i].transform) { | ||
975 | float data[WMAPRO_MAX_CHANNELS]; | ||
976 | const int num_channels = s->chgroup[i].num_channels; | ||
977 | float** ch_data = s->chgroup[i].channel_data; | ||
978 | float** ch_end = ch_data + num_channels; | ||
979 | const int8_t* tb = s->chgroup[i].transform_band; | ||
980 | int16_t* sfb; | ||
981 | |||
982 | /** multichannel decorrelation */ | ||
983 | for (sfb = s->cur_sfb_offsets; | ||
984 | sfb < s->cur_sfb_offsets + s->num_bands; sfb++) { | ||
985 | int y; | ||
986 | if (*tb++ == 1) { | ||
987 | /** multiply values with the decorrelation_matrix */ | ||
988 | for (y = sfb[0]; y < FFMIN(sfb[1], s->subframe_len); y++) { | ||
989 | const float* mat = s->chgroup[i].decorrelation_matrix; | ||
990 | const float* data_end = data + num_channels; | ||
991 | float* data_ptr = data; | ||
992 | float** ch; | ||
993 | |||
994 | for (ch = ch_data; ch < ch_end; ch++) | ||
995 | *data_ptr++ = (*ch)[y]; | ||
996 | |||
997 | for (ch = ch_data; ch < ch_end; ch++) { | ||
998 | float sum = 0; | ||
999 | data_ptr = data; | ||
1000 | while (data_ptr < data_end) | ||
1001 | sum += *data_ptr++ * *mat++; | ||
1002 | |||
1003 | (*ch)[y] = sum; | ||
1004 | } | ||
1005 | } | ||
1006 | } else if (s->num_channels == 2) { | ||
1007 | int len = FFMIN(sfb[1], s->subframe_len) - sfb[0]; | ||
1008 | s->dsp.vector_fmul_scalar(ch_data[0] + sfb[0], | ||
1009 | ch_data[0] + sfb[0], | ||
1010 | 181.0 / 128, len); | ||
1011 | s->dsp.vector_fmul_scalar(ch_data[1] + sfb[0], | ||
1012 | ch_data[1] + sfb[0], | ||
1013 | 181.0 / 128, len); | ||
1014 | } | ||
1015 | } | ||
1016 | } | ||
1017 | } | ||
1018 | } | ||
1019 | |||
1020 | /** | ||
1021 | *@brief Apply sine window and reconstruct the output buffer. | ||
1022 | *@param s codec context | ||
1023 | */ | ||
1024 | static void wmapro_window(WMAProDecodeCtx *s) | ||
1025 | { | ||
1026 | int i; | ||
1027 | for (i = 0; i < s->channels_for_cur_subframe; i++) { | ||
1028 | int c = s->channel_indexes_for_cur_subframe[i]; | ||
1029 | float* window; | ||
1030 | int winlen = s->channel[c].prev_block_len; | ||
1031 | float* start = s->channel[c].coeffs - (winlen >> 1); | ||
1032 | |||
1033 | if (s->subframe_len < winlen) { | ||
1034 | start += (winlen - s->subframe_len) >> 1; | ||
1035 | winlen = s->subframe_len; | ||
1036 | } | ||
1037 | |||
1038 | window = s->windows[av_log2(winlen) - BLOCK_MIN_BITS]; | ||
1039 | |||
1040 | winlen >>= 1; | ||
1041 | |||
1042 | s->dsp.vector_fmul_window(start, start, start + winlen, | ||
1043 | window, 0, winlen); | ||
1044 | |||
1045 | s->channel[c].prev_block_len = s->subframe_len; | ||
1046 | } | ||
1047 | } | ||
1048 | |||
1049 | /** | ||
1050 | *@brief Decode a single subframe (block). | ||
1051 | *@param s codec context | ||
1052 | *@return 0 on success, < 0 when decoding failed | ||
1053 | */ | ||
1054 | static int decode_subframe(WMAProDecodeCtx *s) | ||
1055 | { | ||
1056 | int offset = s->samples_per_frame; | ||
1057 | int subframe_len = s->samples_per_frame; | ||
1058 | int i; | ||
1059 | int total_samples = s->samples_per_frame * s->num_channels; | ||
1060 | int transmit_coeffs = 0; | ||
1061 | int cur_subwoofer_cutoff; | ||
1062 | |||
1063 | s->subframe_offset = get_bits_count(&s->gb); | ||
1064 | |||
1065 | /** reset channel context and find the next block offset and size | ||
1066 | == the next block of the channel with the smallest number of | ||
1067 | decoded samples | ||
1068 | */ | ||
1069 | for (i = 0; i < s->num_channels; i++) { | ||
1070 | s->channel[i].grouped = 0; | ||
1071 | if (offset > s->channel[i].decoded_samples) { | ||
1072 | offset = s->channel[i].decoded_samples; | ||
1073 | subframe_len = | ||
1074 | s->channel[i].subframe_len[s->channel[i].cur_subframe]; | ||
1075 | } | ||
1076 | } | ||
1077 | |||
1078 | dprintf(s->avctx, | ||
1079 | "processing subframe with offset %i len %i\n", offset, subframe_len); | ||
1080 | |||
1081 | /** get a list of all channels that contain the estimated block */ | ||
1082 | s->channels_for_cur_subframe = 0; | ||
1083 | for (i = 0; i < s->num_channels; i++) { | ||
1084 | const int cur_subframe = s->channel[i].cur_subframe; | ||
1085 | /** substract already processed samples */ | ||
1086 | total_samples -= s->channel[i].decoded_samples; | ||
1087 | |||
1088 | /** and count if there are multiple subframes that match our profile */ | ||
1089 | if (offset == s->channel[i].decoded_samples && | ||
1090 | subframe_len == s->channel[i].subframe_len[cur_subframe]) { | ||
1091 | total_samples -= s->channel[i].subframe_len[cur_subframe]; | ||
1092 | s->channel[i].decoded_samples += | ||
1093 | s->channel[i].subframe_len[cur_subframe]; | ||
1094 | s->channel_indexes_for_cur_subframe[s->channels_for_cur_subframe] = i; | ||
1095 | ++s->channels_for_cur_subframe; | ||
1096 | } | ||
1097 | } | ||
1098 | |||
1099 | /** check if the frame will be complete after processing the | ||
1100 | estimated block */ | ||
1101 | if (!total_samples) | ||
1102 | s->parsed_all_subframes = 1; | ||
1103 | |||
1104 | |||
1105 | dprintf(s->avctx, "subframe is part of %i channels\n", | ||
1106 | s->channels_for_cur_subframe); | ||
1107 | |||
1108 | /** calculate number of scale factor bands and their offsets */ | ||
1109 | s->table_idx = av_log2(s->samples_per_frame/subframe_len); | ||
1110 | s->num_bands = s->num_sfb[s->table_idx]; | ||
1111 | s->cur_sfb_offsets = s->sfb_offsets[s->table_idx]; | ||
1112 | cur_subwoofer_cutoff = s->subwoofer_cutoffs[s->table_idx]; | ||
1113 | |||
1114 | /** configure the decoder for the current subframe */ | ||
1115 | for (i = 0; i < s->channels_for_cur_subframe; i++) { | ||
1116 | int c = s->channel_indexes_for_cur_subframe[i]; | ||
1117 | |||
1118 | s->channel[c].coeffs = &s->channel[c].out[(s->samples_per_frame >> 1) | ||
1119 | + offset]; | ||
1120 | } | ||
1121 | |||
1122 | s->subframe_len = subframe_len; | ||
1123 | s->esc_len = av_log2(s->subframe_len - 1) + 1; | ||
1124 | |||
1125 | /** skip extended header if any */ | ||
1126 | if (get_bits1(&s->gb)) { | ||
1127 | int num_fill_bits; | ||
1128 | if (!(num_fill_bits = get_bits(&s->gb, 2))) { | ||
1129 | int len = get_bits(&s->gb, 4); | ||
1130 | num_fill_bits = get_bits(&s->gb, len) + 1; | ||
1131 | } | ||
1132 | |||
1133 | if (num_fill_bits >= 0) { | ||
1134 | if (get_bits_count(&s->gb) + num_fill_bits > s->num_saved_bits) { | ||
1135 | av_log(s->avctx, AV_LOG_ERROR, "invalid number of fill bits\n"); | ||
1136 | return AVERROR_INVALIDDATA; | ||
1137 | } | ||
1138 | |||
1139 | skip_bits_long(&s->gb, num_fill_bits); | ||
1140 | } | ||
1141 | } | ||
1142 | |||
1143 | /** no idea for what the following bit is used */ | ||
1144 | if (get_bits1(&s->gb)) { | ||
1145 | av_log_ask_for_sample(s->avctx, "reserved bit set\n"); | ||
1146 | return AVERROR_INVALIDDATA; | ||
1147 | } | ||
1148 | |||
1149 | |||
1150 | if (decode_channel_transform(s) < 0) | ||
1151 | return AVERROR_INVALIDDATA; | ||
1152 | |||
1153 | |||
1154 | for (i = 0; i < s->channels_for_cur_subframe; i++) { | ||
1155 | int c = s->channel_indexes_for_cur_subframe[i]; | ||
1156 | if ((s->channel[c].transmit_coefs = get_bits1(&s->gb))) | ||
1157 | transmit_coeffs = 1; | ||
1158 | } | ||
1159 | |||
1160 | if (transmit_coeffs) { | ||
1161 | int step; | ||
1162 | int quant_step = 90 * s->bits_per_sample >> 4; | ||
1163 | if ((get_bits1(&s->gb))) { | ||
1164 | /** FIXME: might change run level mode decision */ | ||
1165 | av_log_ask_for_sample(s->avctx, "unsupported quant step coding\n"); | ||
1166 | return AVERROR_INVALIDDATA; | ||
1167 | } | ||
1168 | /** decode quantization step */ | ||
1169 | step = get_sbits(&s->gb, 6); | ||
1170 | quant_step += step; | ||
1171 | if (step == -32 || step == 31) { | ||
1172 | const int sign = (step == 31) - 1; | ||
1173 | int quant = 0; | ||
1174 | while (get_bits_count(&s->gb) + 5 < s->num_saved_bits && | ||
1175 | (step = get_bits(&s->gb, 5)) == 31) { | ||
1176 | quant += 31; | ||
1177 | } | ||
1178 | quant_step += ((quant + step) ^ sign) - sign; | ||
1179 | } | ||
1180 | if (quant_step < 0) { | ||
1181 | av_log(s->avctx, AV_LOG_DEBUG, "negative quant step\n"); | ||
1182 | } | ||
1183 | |||
1184 | /** decode quantization step modifiers for every channel */ | ||
1185 | |||
1186 | if (s->channels_for_cur_subframe == 1) { | ||
1187 | s->channel[s->channel_indexes_for_cur_subframe[0]].quant_step = quant_step; | ||
1188 | } else { | ||
1189 | int modifier_len = get_bits(&s->gb, 3); | ||
1190 | for (i = 0; i < s->channels_for_cur_subframe; i++) { | ||
1191 | int c = s->channel_indexes_for_cur_subframe[i]; | ||
1192 | s->channel[c].quant_step = quant_step; | ||
1193 | if (get_bits1(&s->gb)) { | ||
1194 | if (modifier_len) { | ||
1195 | s->channel[c].quant_step += get_bits(&s->gb, modifier_len) + 1; | ||
1196 | } else | ||
1197 | ++s->channel[c].quant_step; | ||
1198 | } | ||
1199 | } | ||
1200 | } | ||
1201 | |||
1202 | /** decode scale factors */ | ||
1203 | if (decode_scale_factors(s) < 0) | ||
1204 | return AVERROR_INVALIDDATA; | ||
1205 | } | ||
1206 | |||
1207 | dprintf(s->avctx, "BITSTREAM: subframe header length was %i\n", | ||
1208 | get_bits_count(&s->gb) - s->subframe_offset); | ||
1209 | |||
1210 | /** parse coefficients */ | ||
1211 | for (i = 0; i < s->channels_for_cur_subframe; i++) { | ||
1212 | int c = s->channel_indexes_for_cur_subframe[i]; | ||
1213 | if (s->channel[c].transmit_coefs && | ||
1214 | get_bits_count(&s->gb) < s->num_saved_bits) { | ||
1215 | decode_coeffs(s, c); | ||
1216 | } else | ||
1217 | memset(s->channel[c].coeffs, 0, | ||
1218 | sizeof(*s->channel[c].coeffs) * subframe_len); | ||
1219 | } | ||
1220 | |||
1221 | dprintf(s->avctx, "BITSTREAM: subframe length was %i\n", | ||
1222 | get_bits_count(&s->gb) - s->subframe_offset); | ||
1223 | |||
1224 | if (transmit_coeffs) { | ||
1225 | /** reconstruct the per channel data */ | ||
1226 | inverse_channel_transform(s); | ||
1227 | for (i = 0; i < s->channels_for_cur_subframe; i++) { | ||
1228 | int c = s->channel_indexes_for_cur_subframe[i]; | ||
1229 | const int* sf = s->channel[c].scale_factors; | ||
1230 | int b; | ||
1231 | |||
1232 | if (c == s->lfe_channel) | ||
1233 | memset(&s->tmp[cur_subwoofer_cutoff], 0, sizeof(*s->tmp) * | ||
1234 | (subframe_len - cur_subwoofer_cutoff)); | ||
1235 | |||
1236 | /** inverse quantization and rescaling */ | ||
1237 | for (b = 0; b < s->num_bands; b++) { | ||
1238 | const int end = FFMIN(s->cur_sfb_offsets[b+1], s->subframe_len); | ||
1239 | const int exp = s->channel[c].quant_step - | ||
1240 | (s->channel[c].max_scale_factor - *sf++) * | ||
1241 | s->channel[c].scale_factor_step; | ||
1242 | const float quant = pow(10.0, exp / 20.0); | ||
1243 | int start = s->cur_sfb_offsets[b]; | ||
1244 | s->dsp.vector_fmul_scalar(s->tmp + start, | ||
1245 | s->channel[c].coeffs + start, | ||
1246 | quant, end - start); | ||
1247 | } | ||
1248 | |||
1249 | /** apply imdct (ff_imdct_half == DCTIV with reverse) */ | ||
1250 | ff_imdct_half(&s->mdct_ctx[av_log2(subframe_len) - BLOCK_MIN_BITS], | ||
1251 | s->channel[c].coeffs, s->tmp); | ||
1252 | } | ||
1253 | } | ||
1254 | |||
1255 | /** window and overlapp-add */ | ||
1256 | wmapro_window(s); | ||
1257 | |||
1258 | /** handled one subframe */ | ||
1259 | for (i = 0; i < s->channels_for_cur_subframe; i++) { | ||
1260 | int c = s->channel_indexes_for_cur_subframe[i]; | ||
1261 | if (s->channel[c].cur_subframe >= s->channel[c].num_subframes) { | ||
1262 | av_log(s->avctx, AV_LOG_ERROR, "broken subframe\n"); | ||
1263 | return AVERROR_INVALIDDATA; | ||
1264 | } | ||
1265 | ++s->channel[c].cur_subframe; | ||
1266 | } | ||
1267 | |||
1268 | return 0; | ||
1269 | } | ||
1270 | |||
1271 | /** | ||
1272 | *@brief Decode one WMA frame. | ||
1273 | *@param s codec context | ||
1274 | *@return 0 if the trailer bit indicates that this is the last frame, | ||
1275 | * 1 if there are additional frames | ||
1276 | */ | ||
1277 | static int decode_frame(WMAProDecodeCtx *s) | ||
1278 | { | ||
1279 | GetBitContext* gb = &s->gb; | ||
1280 | int more_frames = 0; | ||
1281 | int len = 0; | ||
1282 | int i; | ||
1283 | |||
1284 | /** check for potential output buffer overflow */ | ||
1285 | if (s->num_channels * s->samples_per_frame > s->samples_end - s->samples) { | ||
1286 | /** return an error if no frame could be decoded at all */ | ||
1287 | av_log(s->avctx, AV_LOG_ERROR, | ||
1288 | "not enough space for the output samples\n"); | ||
1289 | s->packet_loss = 1; | ||
1290 | return 0; | ||
1291 | } | ||
1292 | |||
1293 | /** get frame length */ | ||
1294 | if (s->len_prefix) | ||
1295 | len = get_bits(gb, s->log2_frame_size); | ||
1296 | |||
1297 | dprintf(s->avctx, "decoding frame with length %x\n", len); | ||
1298 | |||
1299 | /** decode tile information */ | ||
1300 | if (decode_tilehdr(s)) { | ||
1301 | s->packet_loss = 1; | ||
1302 | return 0; | ||
1303 | } | ||
1304 | |||
1305 | /** read postproc transform */ | ||
1306 | if (s->num_channels > 1 && get_bits1(gb)) { | ||
1307 | av_log_ask_for_sample(s->avctx, "Unsupported postproc transform found\n"); | ||
1308 | s->packet_loss = 1; | ||
1309 | return 0; | ||
1310 | } | ||
1311 | |||
1312 | /** read drc info */ | ||
1313 | if (s->dynamic_range_compression) { | ||
1314 | s->drc_gain = get_bits(gb, 8); | ||
1315 | dprintf(s->avctx, "drc_gain %i\n", s->drc_gain); | ||
1316 | } | ||
1317 | |||
1318 | /** no idea what these are for, might be the number of samples | ||
1319 | that need to be skipped at the beginning or end of a stream */ | ||
1320 | if (get_bits1(gb)) { | ||
1321 | int skip; | ||
1322 | |||
1323 | /** usually true for the first frame */ | ||
1324 | if (get_bits1(gb)) { | ||
1325 | skip = get_bits(gb, av_log2(s->samples_per_frame * 2)); | ||
1326 | dprintf(s->avctx, "start skip: %i\n", skip); | ||
1327 | } | ||
1328 | |||
1329 | /** sometimes true for the last frame */ | ||
1330 | if (get_bits1(gb)) { | ||
1331 | skip = get_bits(gb, av_log2(s->samples_per_frame * 2)); | ||
1332 | dprintf(s->avctx, "end skip: %i\n", skip); | ||
1333 | } | ||
1334 | |||
1335 | } | ||
1336 | |||
1337 | dprintf(s->avctx, "BITSTREAM: frame header length was %i\n", | ||
1338 | get_bits_count(gb) - s->frame_offset); | ||
1339 | |||
1340 | /** reset subframe states */ | ||
1341 | s->parsed_all_subframes = 0; | ||
1342 | for (i = 0; i < s->num_channels; i++) { | ||
1343 | s->channel[i].decoded_samples = 0; | ||
1344 | s->channel[i].cur_subframe = 0; | ||
1345 | s->channel[i].reuse_sf = 0; | ||
1346 | } | ||
1347 | |||
1348 | /** decode all subframes */ | ||
1349 | while (!s->parsed_all_subframes) { | ||
1350 | if (decode_subframe(s) < 0) { | ||
1351 | s->packet_loss = 1; | ||
1352 | return 0; | ||
1353 | } | ||
1354 | } | ||
1355 | |||
1356 | /** interleave samples and write them to the output buffer */ | ||
1357 | for (i = 0; i < s->num_channels; i++) { | ||
1358 | float* ptr = s->samples + i; | ||
1359 | int incr = s->num_channels; | ||
1360 | float* iptr = s->channel[i].out; | ||
1361 | float* iend = iptr + s->samples_per_frame; | ||
1362 | |||
1363 | while (iptr < iend) { | ||
1364 | *ptr = av_clipf(*iptr++, -1.0, 32767.0 / 32768.0); | ||
1365 | ptr += incr; | ||
1366 | } | ||
1367 | |||
1368 | /** reuse second half of the IMDCT output for the next frame */ | ||
1369 | memcpy(&s->channel[i].out[0], | ||
1370 | &s->channel[i].out[s->samples_per_frame], | ||
1371 | s->samples_per_frame * sizeof(*s->channel[i].out) >> 1); | ||
1372 | } | ||
1373 | |||
1374 | if (s->skip_frame) { | ||
1375 | s->skip_frame = 0; | ||
1376 | } else | ||
1377 | s->samples += s->num_channels * s->samples_per_frame; | ||
1378 | |||
1379 | if (len != (get_bits_count(gb) - s->frame_offset) + 2) { | ||
1380 | /** FIXME: not sure if this is always an error */ | ||
1381 | av_log(s->avctx, AV_LOG_ERROR, "frame[%i] would have to skip %i bits\n", | ||
1382 | s->frame_num, len - (get_bits_count(gb) - s->frame_offset) - 1); | ||
1383 | s->packet_loss = 1; | ||
1384 | return 0; | ||
1385 | } | ||
1386 | |||
1387 | /** skip the rest of the frame data */ | ||
1388 | skip_bits_long(gb, len - (get_bits_count(gb) - s->frame_offset) - 1); | ||
1389 | |||
1390 | /** decode trailer bit */ | ||
1391 | more_frames = get_bits1(gb); | ||
1392 | |||
1393 | ++s->frame_num; | ||
1394 | return more_frames; | ||
1395 | } | ||
1396 | |||
1397 | /** | ||
1398 | *@brief Calculate remaining input buffer length. | ||
1399 | *@param s codec context | ||
1400 | *@param gb bitstream reader context | ||
1401 | *@return remaining size in bits | ||
1402 | */ | ||
1403 | static int remaining_bits(WMAProDecodeCtx *s, GetBitContext *gb) | ||
1404 | { | ||
1405 | return s->buf_bit_size - get_bits_count(gb); | ||
1406 | } | ||
1407 | |||
1408 | /** | ||
1409 | *@brief Fill the bit reservoir with a (partial) frame. | ||
1410 | *@param s codec context | ||
1411 | *@param gb bitstream reader context | ||
1412 | *@param len length of the partial frame | ||
1413 | *@param append decides wether to reset the buffer or not | ||
1414 | */ | ||
1415 | static void save_bits(WMAProDecodeCtx *s, GetBitContext* gb, int len, | ||
1416 | int append) | ||
1417 | { | ||
1418 | int buflen; | ||
1419 | |||
1420 | /** when the frame data does not need to be concatenated, the input buffer | ||
1421 | is resetted and additional bits from the previous frame are copyed | ||
1422 | and skipped later so that a fast byte copy is possible */ | ||
1423 | |||
1424 | if (!append) { | ||
1425 | s->frame_offset = get_bits_count(gb) & 7; | ||
1426 | s->num_saved_bits = s->frame_offset; | ||
1427 | init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE); | ||
1428 | } | ||
1429 | |||
1430 | buflen = (s->num_saved_bits + len + 8) >> 3; | ||
1431 | |||
1432 | if (len <= 0 || buflen > MAX_FRAMESIZE) { | ||
1433 | av_log_ask_for_sample(s->avctx, "input buffer too small\n"); | ||
1434 | s->packet_loss = 1; | ||
1435 | return; | ||
1436 | } | ||
1437 | |||
1438 | s->num_saved_bits += len; | ||
1439 | if (!append) { | ||
1440 | ff_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), | ||
1441 | s->num_saved_bits); | ||
1442 | } else { | ||
1443 | int align = 8 - (get_bits_count(gb) & 7); | ||
1444 | align = FFMIN(align, len); | ||
1445 | put_bits(&s->pb, align, get_bits(gb, align)); | ||
1446 | len -= align; | ||
1447 | ff_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), len); | ||
1448 | } | ||
1449 | skip_bits_long(gb, len); | ||
1450 | |||
1451 | { | ||
1452 | PutBitContext tmp = s->pb; | ||
1453 | flush_put_bits(&tmp); | ||
1454 | } | ||
1455 | |||
1456 | init_get_bits(&s->gb, s->frame_data, s->num_saved_bits); | ||
1457 | skip_bits(&s->gb, s->frame_offset); | ||
1458 | } | ||
1459 | |||
1460 | /** | ||
1461 | *@brief Decode a single WMA packet. | ||
1462 | *@param avctx codec context | ||
1463 | *@param data the output buffer | ||
1464 | *@param data_size number of bytes that were written to the output buffer | ||
1465 | *@param avpkt input packet | ||
1466 | *@return number of bytes that were read from the input buffer | ||
1467 | */ | ||
1468 | static int decode_packet(AVCodecContext *avctx, | ||
1469 | void *data, int *data_size, AVPacket* avpkt) | ||
1470 | { | ||
1471 | WMAProDecodeCtx *s = avctx->priv_data; | ||
1472 | GetBitContext* gb = &s->pgb; | ||
1473 | const uint8_t* buf = avpkt->data; | ||
1474 | int buf_size = avpkt->size; | ||
1475 | int num_bits_prev_frame; | ||
1476 | int packet_sequence_number; | ||
1477 | |||
1478 | s->samples = data; | ||
1479 | s->samples_end = (float*)((int8_t*)data + *data_size); | ||
1480 | *data_size = 0; | ||
1481 | |||
1482 | if (s->packet_done || s->packet_loss) { | ||
1483 | s->packet_done = 0; | ||
1484 | s->buf_bit_size = buf_size << 3; | ||
1485 | |||
1486 | /** sanity check for the buffer length */ | ||
1487 | if (buf_size < avctx->block_align) | ||
1488 | return 0; | ||
1489 | |||
1490 | buf_size = avctx->block_align; | ||
1491 | |||
1492 | /** parse packet header */ | ||
1493 | init_get_bits(gb, buf, s->buf_bit_size); | ||
1494 | packet_sequence_number = get_bits(gb, 4); | ||
1495 | skip_bits(gb, 2); | ||
1496 | |||
1497 | /** get number of bits that need to be added to the previous frame */ | ||
1498 | num_bits_prev_frame = get_bits(gb, s->log2_frame_size); | ||
1499 | dprintf(avctx, "packet[%d]: nbpf %x\n", avctx->frame_number, | ||
1500 | num_bits_prev_frame); | ||
1501 | |||
1502 | /** check for packet loss */ | ||
1503 | if (!s->packet_loss && | ||
1504 | ((s->packet_sequence_number + 1) & 0xF) != packet_sequence_number) { | ||
1505 | s->packet_loss = 1; | ||
1506 | av_log(avctx, AV_LOG_ERROR, "Packet loss detected! seq %x vs %x\n", | ||
1507 | s->packet_sequence_number, packet_sequence_number); | ||
1508 | } | ||
1509 | s->packet_sequence_number = packet_sequence_number; | ||
1510 | |||
1511 | if (num_bits_prev_frame > 0) { | ||
1512 | /** append the previous frame data to the remaining data from the | ||
1513 | previous packet to create a full frame */ | ||
1514 | save_bits(s, gb, num_bits_prev_frame, 1); | ||
1515 | dprintf(avctx, "accumulated %x bits of frame data\n", | ||
1516 | s->num_saved_bits - s->frame_offset); | ||
1517 | |||
1518 | /** decode the cross packet frame if it is valid */ | ||
1519 | if (!s->packet_loss) | ||
1520 | decode_frame(s); | ||
1521 | } else if (s->num_saved_bits - s->frame_offset) { | ||
1522 | dprintf(avctx, "ignoring %x previously saved bits\n", | ||
1523 | s->num_saved_bits - s->frame_offset); | ||
1524 | } | ||
1525 | |||
1526 | s->packet_loss = 0; | ||
1527 | |||
1528 | } else { | ||
1529 | int frame_size; | ||
1530 | s->buf_bit_size = avpkt->size << 3; | ||
1531 | init_get_bits(gb, avpkt->data, s->buf_bit_size); | ||
1532 | skip_bits(gb, s->packet_offset); | ||
1533 | if (remaining_bits(s, gb) > s->log2_frame_size && | ||
1534 | (frame_size = show_bits(gb, s->log2_frame_size)) && | ||
1535 | frame_size <= remaining_bits(s, gb)) { | ||
1536 | save_bits(s, gb, frame_size, 0); | ||
1537 | s->packet_done = !decode_frame(s); | ||
1538 | } else | ||
1539 | s->packet_done = 1; | ||
1540 | } | ||
1541 | |||
1542 | if (s->packet_done && !s->packet_loss && | ||
1543 | remaining_bits(s, gb) > 0) { | ||
1544 | /** save the rest of the data so that it can be decoded | ||
1545 | with the next packet */ | ||
1546 | save_bits(s, gb, remaining_bits(s, gb), 0); | ||
1547 | } | ||
1548 | |||
1549 | *data_size = (int8_t *)s->samples - (int8_t *)data; | ||
1550 | s->packet_offset = get_bits_count(gb) & 7; | ||
1551 | |||
1552 | return (s->packet_loss) ? AVERROR_INVALIDDATA : get_bits_count(gb) >> 3; | ||
1553 | } | ||
1554 | |||
1555 | /** | ||
1556 | *@brief Clear decoder buffers (for seeking). | ||
1557 | *@param avctx codec context | ||
1558 | */ | ||
1559 | static void flush(AVCodecContext *avctx) | ||
1560 | { | ||
1561 | WMAProDecodeCtx *s = avctx->priv_data; | ||
1562 | int i; | ||
1563 | /** reset output buffer as a part of it is used during the windowing of a | ||
1564 | new frame */ | ||
1565 | for (i = 0; i < s->num_channels; i++) | ||
1566 | memset(s->channel[i].out, 0, s->samples_per_frame * | ||
1567 | sizeof(*s->channel[i].out)); | ||
1568 | s->packet_loss = 1; | ||
1569 | } | ||
1570 | |||
1571 | #if 0 | ||
1572 | /** | ||
1573 | *@brief wmapro decoder | ||
1574 | */ | ||
1575 | AVCodec wmapro_decoder = { | ||
1576 | "wmapro", | ||
1577 | AVMEDIA_TYPE_AUDIO, | ||
1578 | CODEC_ID_WMAPRO, | ||
1579 | sizeof(WMAProDecodeCtx), | ||
1580 | decode_init, | ||
1581 | NULL, | ||
1582 | decode_end, | ||
1583 | decode_packet, | ||
1584 | .capabilities = CODEC_CAP_SUBFRAMES, | ||
1585 | .flush= flush, | ||
1586 | .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 9 Professional"), | ||
1587 | }; | ||
1588 | #endif | ||
1589 | |||
1590 | int main(void) | ||
1591 | { | ||
1592 | /* possible test program - just here now to silence the linker */ | ||
1593 | return 0; | ||
1594 | } | ||