1 files changed, 270 insertions, 0 deletions

diff --git a/firmware/export/enc_base.h b/firmware/export/enc_base.h
new file mode 100644
index 0000000000..85101ac7fd
--- /dev/null
+++ b/firmware/export/enc_base.h
@@ -0,0 +1,270 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Base declarations for working with software encoders
+ *
+ * Copyright (C) 2006 Michael Sevakis
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#ifndef ENC_BASE_H
+#define ENC_BASE_H
+
+/** encoder config structures **/
+
+/** mp3_enc.codec **/
+#define MP3_BITR_CAP_8      (1 << 0)
+#define MP3_BITR_CAP_16     (1 << 1)
+#define MP3_BITR_CAP_24     (1 << 2)
+#define MP3_BITR_CAP_32     (1 << 3)
+#define MP3_BITR_CAP_40     (1 << 4)
+#define MP3_BITR_CAP_48     (1 << 5)
+#define MP3_BITR_CAP_56     (1 << 6)
+#define MP3_BITR_CAP_64     (1 << 7)
+#define MP3_BITR_CAP_80     (1 << 8)
+#define MP3_BITR_CAP_96     (1 << 9)
+#define MP3_BITR_CAP_112    (1 << 10)
+#define MP3_BITR_CAP_128    (1 << 11)
+#define MP3_BITR_CAP_144    (1 << 12)
+#define MP3_BITR_CAP_160    (1 << 13)
+#define MP3_BITR_CAP_192    (1 << 14)
+#define MP3_BITR_CAP_224    (1 << 15)
+#define MP3_BITR_CAP_256    (1 << 16)
+#define MP3_BITR_CAP_320    (1 << 17)
+#define MP3_ENC_NUM_BITR    18
+
+/* MPEG 1 */
+#define MPEG1_SAMPR_CAPS    (SAMPR_CAP_32 | SAMPR_CAP_48 | SAMPR_CAP_44)
+#define MPEG1_BITR_CAPS     (MP3_BITR_CAP_32  | MP3_BITR_CAP_40  | MP3_BITR_CAP_48  | \
+                             MP3_BITR_CAP_56  | MP3_BITR_CAP_64  | MP3_BITR_CAP_80  | \
+                             MP3_BITR_CAP_96  | MP3_BITR_CAP_112 | MP3_BITR_CAP_128 | \
+                             MP3_BITR_CAP_160 | MP3_BITR_CAP_192 | MP3_BITR_CAP_224 | \
+                             MP3_BITR_CAP_256 | MP3_BITR_CAP_320)
+
+/* MPEG 2 */
+#define MPEG2_SAMPR_CAPS    (SAMPR_CAP_22 | SAMPR_CAP_24 | SAMPR_CAP_16)
+#define MPEG2_BITR_CAPS     (MP3_BITR_CAP_8   | MP3_BITR_CAP_16  | MP3_BITR_CAP_24  | \
+                             MP3_BITR_CAP_32  | MP3_BITR_CAP_40  | MP3_BITR_CAP_48  | \
+                             MP3_BITR_CAP_56  | MP3_BITR_CAP_64  | MP3_BITR_CAP_80  | \
+                             MP3_BITR_CAP_96  | MP3_BITR_CAP_112 | MP3_BITR_CAP_128 | \
+                             MP3_BITR_CAP_144 | MP3_BITR_CAP_160)
+
+#if 0
+/* MPEG 2.5 */
+#define MPEG2_5_SAMPR_CAPS  (SAMPR_CAP_8  | SAMPR_CAP_12 | SAMPR_CAP_11)
+#define MPEG2_5_BITR_CAPS   MPEG2_BITR_CAPS
+#endif
+
+/* Assume 44100 is always available and therefore MPEG1 */
+
+/* HAVE_MPEG* defines mainly apply to the bitrate menu */
+#if (REC_SAMPR_CAPS & MPEG2_SAMPR_CAPS) || defined (HAVE_SPDIF_IN)
+#define HAVE_MPEG2_SAMPR
+#endif
+
+#if 0
+#if (REC_SAMPR_CAPS & MPEG2_5_SAMPR_CAPS) || defined (HAVE_SPDIF_IN)
+#define HAVE_MPEG2_5_SAMPR
+#endif
+#endif /* 0 */
+
+#define MP3_ENC_SAMPR_CAPS      (MPEG1_SAMPR_CAPS | MPEG2_SAMPR_CAPS)
+
+/* This number is count of full encoder set */
+#define MP3_ENC_NUM_SAMPR       6
+
+extern const unsigned long mp3_enc_sampr[MP3_ENC_NUM_SAMPR];
+extern const unsigned long mp3_enc_bitr[MP3_ENC_NUM_BITR];
+
+struct mp3_enc_config
+{
+    unsigned long bitrate;
+};
+
+#define MP3_ENC_BITRATE_CFG_DEFAULT     11 /* 128 */
+#define MP3_ENC_BITRATE_CFG_VALUE_LIST  "8,16,24,32,40,48,56,64,80,96," \
+                                        "112,128,144,160,192,224,256,320"
+
+/** wav_enc.codec **/
+#define WAV_ENC_SAMPR_CAPS      SAMPR_CAP_ALL
+
+struct wav_enc_config
+{
+#if 0
+    unsigned long sample_depth;
+#endif
+};
+
+/** wavpack_enc.codec **/
+#define WAVPACK_ENC_SAMPR_CAPS  SAMPR_CAP_ALL
+
+struct wavpack_enc_config
+{
+#if 0
+    unsigned long sample_depth;
+#endif
+};
+
+struct encoder_config
+{
+    union
+    {
+        /* states which *_enc_config member is valid */
+        int rec_format; /* REC_FORMAT_* value */
+        int afmt;       /* AFMT_* value       */
+    };
+
+    union
+    {
+        struct mp3_enc_config     mp3_enc;
+        struct wavpack_enc_config wavpack_enc;
+        struct wav_enc_config     wav_enc;
+    };          
+};
+
+/** Encoder chunk macros and definitions **/
+#define CHUNKF_START_FILE   0x0001 /* This chunk starts a new file         */
+#define CHUNKF_END_FILE     0x0002 /* This chunk ends the current file     */
+#define CHUNKF_PRERECORD    0x0010 /* This chunk is prerecord data,
+                                      a new file could start anytime       */
+#define CHUNKF_ABORT        0x0020 /* Encoder should not finish this
+                                      chunk                                */
+#define CHUNKF_ERROR    0x80000000 /* An error has occured (passed to/
+                                      from encoder). Use the sign bit to
+                                      check (long)flags < 0.               */
+
+/* Header at the beginning of every encoder chunk */
+struct enc_chunk_hdr
+{
+    unsigned long flags;      /* in/out: flags used by encoder and file
+                                         writing                           */
+    size_t        enc_size;   /* out:    amount of encoder data written to
+                                         chunk                             */
+    unsigned long num_pcm;    /* out:    number of PCM samples eaten during
+                                         processing
+                                         (<= size of allocated buffer)     */
+    unsigned char *enc_data;  /* out:    pointer to enc_size_written bytes
+                                         of encoded audio data in chunk    */
+    /* Encoder defined data follows header. Can be audio data + any other
+       stuff the encoder needs to handle on a per chunk basis */
+};
+
+/* Paranoia: be sure header size is 4-byte aligned */
+#define ENC_CHUNK_HDR_SIZE \
+            ALIGN_UP_P2(sizeof (struct enc_chunk_hdr), 2)
+/* Skip the chunk header and return data */
+#define ENC_CHUNK_SKIP_HDR(t, hdr) \
+            ((typeof (t))((char *)hdr + ENC_CHUNK_HDR_SIZE))
+/* Cast p to struct enc_chunk_hdr * */
+#define ENC_CHUNK_HDR(p) \
+            ((struct enc_chunk_hdr *)(p))
+
+enum enc_events
+{
+    /* File writing events - data points to enc_file_event_data            */
+    ENC_START_FILE = 0,  /* a new file has been opened and no data has yet
+                            been written                                   */
+    ENC_WRITE_CHUNK,     /* write the current chunk to disk                */
+    ENC_END_FILE,        /* current file about to be closed and all valid
+                            data has been written                          */
+    /* Encoder buffer events - data points to enc_buffer_event_data        */
+    ENC_REC_NEW_STREAM,  /* Take steps to finish current stream and start
+                            new                                            */
+};
+
+/**
+ * encoder can write extra data to the file such as headers or more encoded
+ * samples and must update sizes and samples accordingly.
+ */
+struct enc_file_event_data
+{
+    struct enc_chunk_hdr *chunk;   /* Current chunk                        */
+    size_t        new_enc_size;    /* New size of chunk                    */
+    unsigned long new_num_pcm;     /* New number of pcm in chunk           */
+    const char   *filename;        /* filename to open if ENC_START_FILE   */
+    int           rec_file;        /* Current file or < 0 if none          */
+    unsigned long num_pcm_samples; /* Current pcm sample count written to 
+                                      file so far.                         */
+};
+
+/**
+ * encoder may add some data to the end of the last and start of the next
+ * but must never yield when called so any encoding done should be absolutely
+ * minimal.
+ */
+struct enc_buffer_event_data
+{
+    unsigned long         flags;       /* in: One or more of:
+                                        *     CHUNKF_PRERECORD
+                                        *     CHUNKF_END_FILE
+                                        *     CHUNKF_START_FILE
+                                        */
+    struct enc_chunk_hdr *pre_chunk;   /* in: pointer to first prerecord
+                                        *     chunk
+                                        */
+    struct enc_chunk_hdr *chunk;       /* in,out: chunk were split occurs -
+                                        *         first chunk of start
+                                        */
+};
+
+/** Callbacks called by encoder codec **/
+
+/* parameters passed to encoder by enc_get_inputs */
+struct enc_inputs
+{
+    unsigned long sample_rate;     /* out - pcm frequency                  */
+    int           num_channels;    /* out - number of audio channels       */
+    struct encoder_config *config; /* out - encoder settings               */
+};
+
+void enc_get_inputs(struct enc_inputs *inputs);
+
+/* parameters pass from encoder to enc_set_parameters */
+struct enc_parameters
+{
+    /* IN parameters */
+    int           afmt;            /* AFMT_* id - sanity checker           */
+    size_t        chunk_size;      /* max chunk size required              */
+    unsigned long enc_sample_rate; /* actual sample rate used by encoder
+                                      (for recorded time calculation)      */
+    size_t        reserve_bytes;   /* number of bytes to reserve immediately
+                                      following chunks                     */
+    void (*events_callback)(enum enc_events event,
+                            void *data); /*  pointer to events callback    */
+    /* OUT parameters */
+    unsigned char *enc_buffer;     /* pointer to enc_buffer                */
+    size_t         buf_chunk_size; /* size of chunks in enc_buffer         */
+    int            num_chunks;     /* number of chunks allotted to encoder */
+    unsigned char *reserve_buffer; /* pointer to reserve_bytes bytes       */
+};
+
+/* set the encoder dimensions - called by encoder codec at initialization
+   and termination */
+void   enc_set_parameters(struct enc_parameters *params);
+/* returns pointer to next write chunk in circular buffer */
+struct enc_chunk_hdr * enc_get_chunk(void);
+/* releases the current chunk into the available chunks */
+void   enc_finish_chunk(void);
+/* checks near empty state on pcm input buffer */
+int    enc_pcm_buf_near_empty(void);
+
+#define PCM_MAX_FEED_SIZE       20000 /* max pcm size passed to encoder    */
+
+/* passes a pointer to next chunk of unprocessed wav data */
+unsigned char * enc_get_pcm_data(size_t size);
+/* puts some pcm data back in the queue */
+size_t          enc_unget_pcm_data(size_t size);
+
+#endif /* ENC_BASE_H */