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170 lines
5.5 KiB
170 lines
5.5 KiB
/* |
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* RAW PCM demuxers |
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* Copyright (c) 2002 Fabrice Bellard |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "avformat.h" |
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#include "internal.h" |
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#include "pcm.h" |
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#include "libavutil/log.h" |
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#include "libavutil/opt.h" |
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#include "libavutil/avassert.h" |
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#define RAW_SAMPLES 1024 |
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typedef struct PCMAudioDemuxerContext { |
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AVClass *class; |
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int sample_rate; |
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int channels; |
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} PCMAudioDemuxerContext; |
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static int pcm_read_header(AVFormatContext *s) |
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{ |
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PCMAudioDemuxerContext *s1 = s->priv_data; |
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AVStream *st; |
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st = avformat_new_stream(s, NULL); |
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if (!st) |
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return AVERROR(ENOMEM); |
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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st->codec->codec_id = s->iformat->raw_codec_id; |
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st->codec->sample_rate = s1->sample_rate; |
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st->codec->channels = s1->channels; |
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st->codec->bits_per_coded_sample = |
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av_get_bits_per_sample(st->codec->codec_id); |
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av_assert0(st->codec->bits_per_coded_sample > 0); |
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st->codec->block_align = |
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st->codec->bits_per_coded_sample * st->codec->channels / 8; |
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avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); |
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return 0; |
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} |
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static int pcm_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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int ret, size, bps; |
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// AVStream *st = s->streams[0]; |
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size= RAW_SAMPLES*s->streams[0]->codec->block_align; |
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ret= av_get_packet(s->pb, pkt, size); |
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pkt->flags &= ~AV_PKT_FLAG_CORRUPT; |
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pkt->stream_index = 0; |
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if (ret < 0) |
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return ret; |
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bps= av_get_bits_per_sample(s->streams[0]->codec->codec_id); |
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av_assert1(bps); // if false there IS a bug elsewhere (NOT in this function) |
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pkt->dts= |
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pkt->pts= pkt->pos*8 / (bps * s->streams[0]->codec->channels); |
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return ret; |
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} |
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static const AVOption pcm_options[] = { |
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{ "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 44100}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, |
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{ "channels", "", offsetof(PCMAudioDemuxerContext, channels), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, |
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{ NULL }, |
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}; |
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#define PCMDEF(name_, long_name_, ext, codec) \ |
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static const AVClass name_ ## _demuxer_class = { \ |
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.class_name = #name_ " demuxer", \ |
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.item_name = av_default_item_name, \ |
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.option = pcm_options, \ |
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.version = LIBAVUTIL_VERSION_INT, \ |
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}; \ |
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AVInputFormat ff_pcm_ ## name_ ## _demuxer = { \ |
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.name = #name_, \ |
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.long_name = NULL_IF_CONFIG_SMALL(long_name_), \ |
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.priv_data_size = sizeof(PCMAudioDemuxerContext), \ |
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.read_header = pcm_read_header, \ |
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.read_packet = pcm_read_packet, \ |
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.read_seek = ff_pcm_read_seek, \ |
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.flags = AVFMT_GENERIC_INDEX, \ |
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.extensions = ext, \ |
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.raw_codec_id = codec, \ |
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.priv_class = &name_ ## _demuxer_class, \ |
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}; |
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PCMDEF(f64be, "PCM 64-bit floating-point big-endian", |
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NULL, AV_CODEC_ID_PCM_F64BE) |
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PCMDEF(f64le, "PCM 64-bit floating-point little-endian", |
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NULL, AV_CODEC_ID_PCM_F64LE) |
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PCMDEF(f32be, "PCM 32-bit floating-point big-endian", |
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NULL, AV_CODEC_ID_PCM_F32BE) |
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PCMDEF(f32le, "PCM 32-bit floating-point little-endian", |
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NULL, AV_CODEC_ID_PCM_F32LE) |
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PCMDEF(s32be, "PCM signed 32-bit big-endian", |
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NULL, AV_CODEC_ID_PCM_S32BE) |
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PCMDEF(s32le, "PCM signed 32-bit little-endian", |
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NULL, AV_CODEC_ID_PCM_S32LE) |
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PCMDEF(s24be, "PCM signed 24-bit big-endian", |
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NULL, AV_CODEC_ID_PCM_S24BE) |
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PCMDEF(s24le, "PCM signed 24-bit little-endian", |
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NULL, AV_CODEC_ID_PCM_S24LE) |
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PCMDEF(s16be, "PCM signed 16-bit big-endian", |
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AV_NE("sw", NULL), AV_CODEC_ID_PCM_S16BE) |
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PCMDEF(s16le, "PCM signed 16-bit little-endian", |
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AV_NE(NULL, "sw"), AV_CODEC_ID_PCM_S16LE) |
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PCMDEF(s8, "PCM signed 8-bit", |
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"sb", AV_CODEC_ID_PCM_S8) |
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PCMDEF(u32be, "PCM unsigned 32-bit big-endian", |
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NULL, AV_CODEC_ID_PCM_U32BE) |
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PCMDEF(u32le, "PCM unsigned 32-bit little-endian", |
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NULL, AV_CODEC_ID_PCM_U32LE) |
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PCMDEF(u24be, "PCM unsigned 24-bit big-endian", |
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NULL, AV_CODEC_ID_PCM_U24BE) |
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PCMDEF(u24le, "PCM unsigned 24-bit little-endian", |
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NULL, AV_CODEC_ID_PCM_U24LE) |
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PCMDEF(u16be, "PCM unsigned 16-bit big-endian", |
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AV_NE("uw", NULL), AV_CODEC_ID_PCM_U16BE) |
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PCMDEF(u16le, "PCM unsigned 16-bit little-endian", |
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AV_NE(NULL, "uw"), AV_CODEC_ID_PCM_U16LE) |
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PCMDEF(u8, "PCM unsigned 8-bit", |
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"ub", AV_CODEC_ID_PCM_U8) |
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PCMDEF(alaw, "PCM A-law", |
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"al", AV_CODEC_ID_PCM_ALAW) |
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PCMDEF(mulaw, "PCM mu-law", |
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"ul", AV_CODEC_ID_PCM_MULAW)
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