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