2 * RAW muxer and demuxer
3 * Copyright (c) 2001 Fabrice Bellard
4 * Copyright (c) 2005 Alex Beregszaszi
6 * This file is part of FFmpeg.
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.
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.
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
23 #include "libavutil/crc.h"
24 #include "libavcodec/ac3_parser.h"
25 #include "libavcodec/get_bits.h"
26 #include "libavcodec/bytestream.h"
35 static int null_write_packet(struct AVFormatContext *s, AVPacket *pkt)
42 int ff_raw_write_packet(AVFormatContext *s, AVPacket *pkt)
44 put_buffer(s->pb, pkt->data, pkt->size);
45 put_flush_packet(s->pb);
52 static int raw_read_header(AVFormatContext *s, AVFormatParameters *ap)
57 st = av_new_stream(s, 0);
59 return AVERROR(ENOMEM);
61 id = s->iformat->value;
62 if (id == CODEC_ID_RAWVIDEO) {
63 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
65 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
67 st->codec->codec_id = id;
69 switch(st->codec->codec_type) {
70 case AVMEDIA_TYPE_AUDIO:
71 st->codec->sample_rate = ap->sample_rate;
72 if(ap->channels) st->codec->channels = ap->channels;
73 else st->codec->channels = 1;
74 st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
75 assert(st->codec->bits_per_coded_sample > 0);
76 st->codec->block_align = st->codec->bits_per_coded_sample*st->codec->channels/8;
77 av_set_pts_info(st, 64, 1, st->codec->sample_rate);
79 case AVMEDIA_TYPE_VIDEO:
81 av_set_pts_info(st, 64, ap->time_base.num, ap->time_base.den);
83 av_set_pts_info(st, 64, 1, 25);
84 st->codec->width = ap->width;
85 st->codec->height = ap->height;
86 st->codec->pix_fmt = ap->pix_fmt;
87 if(st->codec->pix_fmt == PIX_FMT_NONE)
88 st->codec->pix_fmt= PIX_FMT_YUV420P;
96 #define RAW_PACKET_SIZE 1024
97 #define RAW_SAMPLES 1024
99 static int raw_read_packet(AVFormatContext *s, AVPacket *pkt)
102 // AVStream *st = s->streams[0];
104 size= RAW_SAMPLES*s->streams[0]->codec->block_align;
106 ret= av_get_packet(s->pb, pkt, size);
108 pkt->stream_index = 0;
112 bps= av_get_bits_per_sample(s->streams[0]->codec->codec_id);
113 assert(bps); // if false there IS a bug elsewhere (NOT in this function)
115 pkt->pts= pkt->pos*8 / (bps * s->streams[0]->codec->channels);
120 int ff_raw_read_partial_packet(AVFormatContext *s, AVPacket *pkt)
124 size = RAW_PACKET_SIZE;
126 if (av_new_packet(pkt, size) < 0)
127 return AVERROR(ENOMEM);
129 pkt->pos= url_ftell(s->pb);
130 pkt->stream_index = 0;
131 ret = get_partial_buffer(s->pb, pkt->data, size);
141 #if CONFIG_RAWVIDEO_DEMUXER
142 static int rawvideo_read_packet(AVFormatContext *s, AVPacket *pkt)
144 int packet_size, ret, width, height;
145 AVStream *st = s->streams[0];
147 width = st->codec->width;
148 height = st->codec->height;
150 packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
154 ret= av_get_packet(s->pb, pkt, packet_size);
156 pkt->dts= pkt->pos / packet_size;
158 pkt->stream_index = 0;
166 int pcm_read_seek(AVFormatContext *s,
167 int stream_index, int64_t timestamp, int flags)
170 int block_align, byte_rate;
175 block_align = st->codec->block_align ? st->codec->block_align :
176 (av_get_bits_per_sample(st->codec->codec_id) * st->codec->channels) >> 3;
177 byte_rate = st->codec->bit_rate ? st->codec->bit_rate >> 3 :
178 block_align * st->codec->sample_rate;
180 if (block_align <= 0 || byte_rate <= 0)
182 if (timestamp < 0) timestamp = 0;
184 /* compute the position by aligning it to block_align */
185 pos = av_rescale_rnd(timestamp * byte_rate,
187 st->time_base.den * (int64_t)block_align,
188 (flags & AVSEEK_FLAG_BACKWARD) ? AV_ROUND_DOWN : AV_ROUND_UP);
191 /* recompute exact position */
192 st->cur_dts = av_rescale(pos, st->time_base.den, byte_rate * (int64_t)st->time_base.num);
193 if ((ret = url_fseek(s->pb, pos + s->data_offset, SEEK_SET)) < 0)
198 int ff_raw_audio_read_header(AVFormatContext *s,
199 AVFormatParameters *ap)
201 AVStream *st = av_new_stream(s, 0);
203 return AVERROR(ENOMEM);
204 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
205 st->codec->codec_id = s->iformat->value;
206 st->need_parsing = AVSTREAM_PARSE_FULL;
207 /* the parameters will be extracted from the compressed bitstream */
212 /* MPEG-1/H.263 input */
213 int ff_raw_video_read_header(AVFormatContext *s,
214 AVFormatParameters *ap)
218 st = av_new_stream(s, 0);
220 return AVERROR(ENOMEM);
222 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
223 st->codec->codec_id = s->iformat->value;
224 st->need_parsing = AVSTREAM_PARSE_FULL;
226 /* for MJPEG, specify frame rate */
227 /* for MPEG-4 specify it, too (most MPEG-4 streams do not have the fixed_vop_rate set ...)*/
228 if (ap->time_base.num) {
229 st->codec->time_base= ap->time_base;
230 } else if ( st->codec->codec_id == CODEC_ID_MJPEG ||
231 st->codec->codec_id == CODEC_ID_MPEG4 ||
232 st->codec->codec_id == CODEC_ID_DIRAC ||
233 st->codec->codec_id == CODEC_ID_DNXHD ||
234 st->codec->codec_id == CODEC_ID_VC1 ||
235 st->codec->codec_id == CODEC_ID_H264) {
236 st->codec->time_base= (AVRational){1,25};
238 av_set_pts_info(st, 64, 1, 1200000);
244 #if CONFIG_H263_DEMUXER
245 static int h263_probe(AVProbeData *p)
252 int src_fmt, last_src_fmt=-1;
255 for(i=0; i<p->buf_size; i++){
256 code = (code<<8) + p->buf[i];
257 if ((code & 0xfffffc0000) == 0x800000) {
258 src_fmt= (code>>2)&3;
259 if( src_fmt != last_src_fmt
260 && last_src_fmt>0 && last_src_fmt<6
264 if((code&0x300)==0x200 && src_fmt){
269 last_src_fmt= src_fmt;
270 } else if((code & 0xffff800000) == 0x800000) {
271 int gn= (code>>(23-5)) & 0x1F;
278 //av_log(NULL, AV_LOG_ERROR, "h263_probe: psc:%d invalid:%d res_change:%d\n", valid_psc, invalid_psc, res_change);
279 //h263_probe: psc:3 invalid:0 res_change:0 (1588/recent_ffmpeg_parses_mpg_incorrectly.mpg)
280 if(valid_psc > 2*invalid_psc + 2*res_change + 3){
282 }else if(valid_psc > 2*invalid_psc)
288 #if CONFIG_H261_DEMUXER
289 static int h261_probe(AVProbeData *p)
299 init_get_bits(&gb, p->buf, p->buf_size*8);
301 for(i=0; i<p->buf_size*8; i++){
302 if ((code & 0x01ff0000) || !(code & 0xff00)) {
303 code = (code<<8) + get_bits(&gb, 8);
306 code = (code<<1) + get_bits1(&gb);
307 if ((code & 0xffff0000) == 0x10000) {
308 int gn= (code>>12)&0xf;
311 if(gn != next_gn) invalid_psc++;
317 next_gn= (gn+1+!!gn)% 7;
321 if(valid_psc > 2*invalid_psc + 6){
323 }else if(valid_psc > 2*invalid_psc + 2)
329 #if CONFIG_DIRAC_DEMUXER
330 static int dirac_probe(AVProbeData *p)
332 if (AV_RL32(p->buf) == MKTAG('B', 'B', 'C', 'D'))
333 return AVPROBE_SCORE_MAX;
339 #if CONFIG_DNXHD_DEMUXER
340 static int dnxhd_probe(AVProbeData *p)
342 static const uint8_t header[] = {0x00,0x00,0x02,0x80,0x01};
343 int w, h, compression_id;
344 if (p->buf_size < 0x2c)
346 if (memcmp(p->buf, header, 5))
348 h = AV_RB16(p->buf + 0x18);
349 w = AV_RB16(p->buf + 0x1a);
352 compression_id = AV_RB32(p->buf + 0x28);
353 if (compression_id < 1237 || compression_id > 1253)
355 return AVPROBE_SCORE_MAX;
359 #if CONFIG_AC3_DEMUXER || CONFIG_EAC3_DEMUXER
360 static int ac3_eac3_probe(AVProbeData *p, enum CodecID expected_codec_id)
362 int max_frames, first_frames = 0, frames;
363 uint8_t *buf, *buf2, *end;
366 enum CodecID codec_id = CODEC_ID_AC3;
370 end = buf + p->buf_size;
372 for(; buf < end; buf++) {
375 for(frames = 0; buf2 < end; frames++) {
376 init_get_bits(&gbc, buf2, 54);
377 if(ff_ac3_parse_header(&gbc, &hdr) < 0)
379 if(buf2 + hdr.frame_size > end ||
380 av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, buf2 + 2, hdr.frame_size - 2))
382 if (hdr.bitstream_id > 10)
383 codec_id = CODEC_ID_EAC3;
384 buf2 += hdr.frame_size;
386 max_frames = FFMAX(max_frames, frames);
388 first_frames = frames;
390 if(codec_id != expected_codec_id) return 0;
391 // keep this in sync with mp3 probe, both need to avoid
392 // issues with MPEG-files!
393 if (first_frames>=4) return AVPROBE_SCORE_MAX/2+1;
394 else if(max_frames>500)return AVPROBE_SCORE_MAX/2;
395 else if(max_frames>=4) return AVPROBE_SCORE_MAX/4;
396 else if(max_frames>=1) return 1;
401 #if CONFIG_AC3_DEMUXER
402 static int ac3_probe(AVProbeData *p)
404 return ac3_eac3_probe(p, CODEC_ID_AC3);
408 #if CONFIG_EAC3_DEMUXER
409 static int eac3_probe(AVProbeData *p)
411 return ac3_eac3_probe(p, CODEC_ID_EAC3);
415 /* Note: Do not forget to add new entries to the Makefile as well. */
417 #if CONFIG_AC3_DEMUXER
418 AVInputFormat ac3_demuxer = {
420 NULL_IF_CONFIG_SMALL("raw AC-3"),
423 ff_raw_audio_read_header,
424 ff_raw_read_partial_packet,
425 .flags= AVFMT_GENERIC_INDEX,
427 .value = CODEC_ID_AC3,
432 AVOutputFormat ac3_muxer = {
434 NULL_IF_CONFIG_SMALL("raw AC-3"),
442 .flags= AVFMT_NOTIMESTAMPS,
446 #if CONFIG_DIRAC_DEMUXER
447 AVInputFormat dirac_demuxer = {
449 NULL_IF_CONFIG_SMALL("raw Dirac"),
452 ff_raw_video_read_header,
453 ff_raw_read_partial_packet,
454 .flags= AVFMT_GENERIC_INDEX,
455 .value = CODEC_ID_DIRAC,
459 #if CONFIG_DIRAC_MUXER
460 AVOutputFormat dirac_muxer = {
462 NULL_IF_CONFIG_SMALL("raw Dirac"),
470 .flags= AVFMT_NOTIMESTAMPS,
474 #if CONFIG_DNXHD_DEMUXER
475 AVInputFormat dnxhd_demuxer = {
477 NULL_IF_CONFIG_SMALL("raw DNxHD (SMPTE VC-3)"),
480 ff_raw_video_read_header,
481 ff_raw_read_partial_packet,
482 .flags= AVFMT_GENERIC_INDEX,
483 .value = CODEC_ID_DNXHD,
487 #if CONFIG_DNXHD_MUXER
488 AVOutputFormat dnxhd_muxer = {
490 NULL_IF_CONFIG_SMALL("raw DNxHD (SMPTE VC-3)"),
498 .flags= AVFMT_NOTIMESTAMPS,
503 AVOutputFormat dts_muxer = {
505 NULL_IF_CONFIG_SMALL("raw DTS"),
513 .flags= AVFMT_NOTIMESTAMPS,
517 #if CONFIG_EAC3_DEMUXER
518 AVInputFormat eac3_demuxer = {
520 NULL_IF_CONFIG_SMALL("raw E-AC-3"),
523 ff_raw_audio_read_header,
524 ff_raw_read_partial_packet,
525 .flags= AVFMT_GENERIC_INDEX,
526 .extensions = "eac3",
527 .value = CODEC_ID_EAC3,
531 #if CONFIG_EAC3_MUXER
532 AVOutputFormat eac3_muxer = {
534 NULL_IF_CONFIG_SMALL("raw E-AC-3"),
542 .flags= AVFMT_NOTIMESTAMPS,
546 #if CONFIG_GSM_DEMUXER
547 AVInputFormat gsm_demuxer = {
549 NULL_IF_CONFIG_SMALL("raw GSM"),
552 ff_raw_audio_read_header,
553 ff_raw_read_partial_packet,
554 .flags= AVFMT_GENERIC_INDEX,
556 .value = CODEC_ID_GSM,
560 #if CONFIG_H261_DEMUXER
561 AVInputFormat h261_demuxer = {
563 NULL_IF_CONFIG_SMALL("raw H.261"),
566 ff_raw_video_read_header,
567 ff_raw_read_partial_packet,
568 .flags= AVFMT_GENERIC_INDEX,
569 .extensions = "h261",
570 .value = CODEC_ID_H261,
574 #if CONFIG_H261_MUXER
575 AVOutputFormat h261_muxer = {
577 NULL_IF_CONFIG_SMALL("raw H.261"),
585 .flags= AVFMT_NOTIMESTAMPS,
589 #if CONFIG_H263_DEMUXER
590 AVInputFormat h263_demuxer = {
592 NULL_IF_CONFIG_SMALL("raw H.263"),
595 ff_raw_video_read_header,
596 ff_raw_read_partial_packet,
597 .flags= AVFMT_GENERIC_INDEX,
598 // .extensions = "h263", //FIXME remove after writing mpeg4_probe
599 .value = CODEC_ID_H263,
603 #if CONFIG_H263_MUXER
604 AVOutputFormat h263_muxer = {
606 NULL_IF_CONFIG_SMALL("raw H.263"),
614 .flags= AVFMT_NOTIMESTAMPS,
618 #if CONFIG_H264_MUXER
619 AVOutputFormat h264_muxer = {
621 NULL_IF_CONFIG_SMALL("raw H.264 video format"),
629 .flags= AVFMT_NOTIMESTAMPS,
633 #if CONFIG_CAVSVIDEO_MUXER
634 AVOutputFormat cavsvideo_muxer = {
636 NULL_IF_CONFIG_SMALL("raw Chinese AVS video"),
644 .flags= AVFMT_NOTIMESTAMPS,
649 AVOutputFormat m4v_muxer = {
651 NULL_IF_CONFIG_SMALL("raw MPEG-4 video format"),
659 .flags= AVFMT_NOTIMESTAMPS,
663 #if CONFIG_MJPEG_DEMUXER
664 AVInputFormat mjpeg_demuxer = {
666 NULL_IF_CONFIG_SMALL("raw MJPEG video"),
669 ff_raw_video_read_header,
670 ff_raw_read_partial_packet,
671 .flags= AVFMT_GENERIC_INDEX,
672 .extensions = "mjpg,mjpeg",
673 .value = CODEC_ID_MJPEG,
677 #if CONFIG_MJPEG_MUXER
678 AVOutputFormat mjpeg_muxer = {
680 NULL_IF_CONFIG_SMALL("raw MJPEG video"),
688 .flags= AVFMT_NOTIMESTAMPS,
692 #if CONFIG_MLP_DEMUXER
693 AVInputFormat mlp_demuxer = {
695 NULL_IF_CONFIG_SMALL("raw MLP"),
698 ff_raw_audio_read_header,
699 ff_raw_read_partial_packet,
700 .flags= AVFMT_GENERIC_INDEX,
702 .value = CODEC_ID_MLP,
707 AVOutputFormat mlp_muxer = {
709 NULL_IF_CONFIG_SMALL("raw MLP"),
717 .flags= AVFMT_NOTIMESTAMPS,
722 AVOutputFormat srt_muxer = {
724 .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle format"),
725 .mime_type = "application/x-subrip",
727 .write_packet = ff_raw_write_packet,
728 .flags = AVFMT_NOTIMESTAMPS,
729 .subtitle_codec = CODEC_ID_SRT,
733 #if CONFIG_TRUEHD_DEMUXER
734 AVInputFormat truehd_demuxer = {
736 NULL_IF_CONFIG_SMALL("raw TrueHD"),
739 ff_raw_audio_read_header,
740 ff_raw_read_partial_packet,
741 .flags= AVFMT_GENERIC_INDEX,
743 .value = CODEC_ID_TRUEHD,
747 #if CONFIG_TRUEHD_MUXER
748 AVOutputFormat truehd_muxer = {
750 NULL_IF_CONFIG_SMALL("raw TrueHD"),
758 .flags= AVFMT_NOTIMESTAMPS,
762 #if CONFIG_MPEG1VIDEO_MUXER
763 AVOutputFormat mpeg1video_muxer = {
765 NULL_IF_CONFIG_SMALL("raw MPEG-1 video"),
773 .flags= AVFMT_NOTIMESTAMPS,
777 #if CONFIG_MPEG2VIDEO_MUXER
778 AVOutputFormat mpeg2video_muxer = {
780 NULL_IF_CONFIG_SMALL("raw MPEG-2 video"),
788 .flags= AVFMT_NOTIMESTAMPS,
792 #if CONFIG_NULL_MUXER
793 AVOutputFormat null_muxer = {
795 NULL_IF_CONFIG_SMALL("raw null video format"),
799 AV_NE(CODEC_ID_PCM_S16BE, CODEC_ID_PCM_S16LE),
803 .flags = AVFMT_NOFILE | AVFMT_RAWPICTURE | AVFMT_NOTIMESTAMPS,
807 #if CONFIG_RAWVIDEO_DEMUXER
808 AVInputFormat rawvideo_demuxer = {
810 NULL_IF_CONFIG_SMALL("raw video format"),
814 rawvideo_read_packet,
815 .flags= AVFMT_GENERIC_INDEX,
816 .extensions = "yuv,cif,qcif,rgb",
817 .value = CODEC_ID_RAWVIDEO,
821 #if CONFIG_RAWVIDEO_MUXER
822 AVOutputFormat rawvideo_muxer = {
824 NULL_IF_CONFIG_SMALL("raw video format"),
832 .flags= AVFMT_NOTIMESTAMPS,
836 #if CONFIG_SHORTEN_DEMUXER
837 AVInputFormat shorten_demuxer = {
839 NULL_IF_CONFIG_SMALL("raw Shorten"),
842 ff_raw_audio_read_header,
843 ff_raw_read_partial_packet,
844 .flags= AVFMT_GENERIC_INDEX,
846 .value = CODEC_ID_SHORTEN,
850 #if CONFIG_VC1_DEMUXER
851 AVInputFormat vc1_demuxer = {
853 NULL_IF_CONFIG_SMALL("raw VC-1"),
855 NULL /* vc1_probe */,
856 ff_raw_video_read_header,
857 ff_raw_read_partial_packet,
859 .value = CODEC_ID_VC1,
865 #define PCMINPUTDEF(name, long_name, ext, codec) \
866 AVInputFormat pcm_ ## name ## _demuxer = {\
868 NULL_IF_CONFIG_SMALL(long_name),\
875 .flags= AVFMT_GENERIC_INDEX,\
880 #define PCMOUTPUTDEF(name, long_name, ext, codec) \
881 AVOutputFormat pcm_ ## name ## _muxer = {\
883 NULL_IF_CONFIG_SMALL(long_name),\
890 ff_raw_write_packet,\
891 .flags= AVFMT_NOTIMESTAMPS,\
895 #if !CONFIG_MUXERS && CONFIG_DEMUXERS
896 #define PCMDEF(name, long_name, ext, codec) \
897 PCMINPUTDEF(name, long_name, ext, codec)
898 #elif CONFIG_MUXERS && !CONFIG_DEMUXERS
899 #define PCMDEF(name, long_name, ext, codec) \
900 PCMOUTPUTDEF(name, long_name, ext, codec)
901 #elif CONFIG_MUXERS && CONFIG_DEMUXERS
902 #define PCMDEF(name, long_name, ext, codec) \
903 PCMINPUTDEF(name, long_name, ext, codec)\
904 PCMOUTPUTDEF(name, long_name, ext, codec)
906 #define PCMDEF(name, long_name, ext, codec)
911 #define LE_DEF(s) NULL
913 #define BE_DEF(s) NULL
917 PCMDEF(f64be, "PCM 64 bit floating-point big-endian format",
918 NULL, CODEC_ID_PCM_F64BE)
920 PCMDEF(f64le, "PCM 64 bit floating-point little-endian format",
921 NULL, CODEC_ID_PCM_F64LE)
923 PCMDEF(f32be, "PCM 32 bit floating-point big-endian format",
924 NULL, CODEC_ID_PCM_F32BE)
926 PCMDEF(f32le, "PCM 32 bit floating-point little-endian format",
927 NULL, CODEC_ID_PCM_F32LE)
929 PCMDEF(s32be, "PCM signed 32 bit big-endian format",
930 NULL, CODEC_ID_PCM_S32BE)
932 PCMDEF(s32le, "PCM signed 32 bit little-endian format",
933 NULL, CODEC_ID_PCM_S32LE)
935 PCMDEF(s24be, "PCM signed 24 bit big-endian format",
936 NULL, CODEC_ID_PCM_S24BE)
938 PCMDEF(s24le, "PCM signed 24 bit little-endian format",
939 NULL, CODEC_ID_PCM_S24LE)
941 PCMDEF(s16be, "PCM signed 16 bit big-endian format",
942 BE_DEF("sw"), CODEC_ID_PCM_S16BE)
944 PCMDEF(s16le, "PCM signed 16 bit little-endian format",
945 LE_DEF("sw"), CODEC_ID_PCM_S16LE)
947 PCMDEF(s8, "PCM signed 8 bit format",
948 "sb", CODEC_ID_PCM_S8)
950 PCMDEF(u32be, "PCM unsigned 32 bit big-endian format",
951 NULL, CODEC_ID_PCM_U32BE)
953 PCMDEF(u32le, "PCM unsigned 32 bit little-endian format",
954 NULL, CODEC_ID_PCM_U32LE)
956 PCMDEF(u24be, "PCM unsigned 24 bit big-endian format",
957 NULL, CODEC_ID_PCM_U24BE)
959 PCMDEF(u24le, "PCM unsigned 24 bit little-endian format",
960 NULL, CODEC_ID_PCM_U24LE)
962 PCMDEF(u16be, "PCM unsigned 16 bit big-endian format",
963 BE_DEF("uw"), CODEC_ID_PCM_U16BE)
965 PCMDEF(u16le, "PCM unsigned 16 bit little-endian format",
966 LE_DEF("uw"), CODEC_ID_PCM_U16LE)
968 PCMDEF(u8, "PCM unsigned 8 bit format",
969 "ub", CODEC_ID_PCM_U8)
971 PCMDEF(alaw, "PCM A-law format",
972 "al", CODEC_ID_PCM_ALAW)
974 PCMDEF(mulaw, "PCM mu-law format",
975 "ul", CODEC_ID_PCM_MULAW)