mirror of
https://github.com/FFmpeg/FFmpeg.git
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216 lines
7.6 KiB
C
216 lines
7.6 KiB
C
/*
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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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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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uint8_t *mime_type = NULL;
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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->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = s->iformat->raw_codec_id;
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st->codecpar->sample_rate = s1->sample_rate;
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st->codecpar->channels = s1->channels;
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av_opt_get(s->pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &mime_type);
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if (mime_type && s->iformat->mime_type) {
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int rate = 0, channels = 0, little_endian = 0;
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size_t len = strlen(s->iformat->mime_type);
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if (!av_strncasecmp(s->iformat->mime_type, mime_type, len)) { /* audio/L16 */
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uint8_t *options = mime_type + len;
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len = strlen(mime_type);
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while (options < mime_type + len) {
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options = strstr(options, ";");
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if (!options++)
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break;
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if (!rate)
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sscanf(options, " rate=%d", &rate);
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if (!channels)
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sscanf(options, " channels=%d", &channels);
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if (!little_endian) {
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char val[14]; /* sizeof("little-endian") == 14 */
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if (sscanf(options, " endianness=%13s", val) == 1) {
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little_endian = strcmp(val, "little-endian") == 0;
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}
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}
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}
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if (rate <= 0) {
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av_log(s, AV_LOG_ERROR,
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"Invalid sample_rate found in mime_type \"%s\"\n",
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mime_type);
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av_freep(&mime_type);
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return AVERROR_INVALIDDATA;
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}
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st->codecpar->sample_rate = rate;
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if (channels > 0)
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st->codecpar->channels = channels;
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if (little_endian)
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st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
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}
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}
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av_freep(&mime_type);
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st->codecpar->bits_per_coded_sample =
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av_get_bits_per_sample(st->codecpar->codec_id);
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av_assert0(st->codecpar->bits_per_coded_sample > 0);
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st->codecpar->block_align =
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st->codecpar->bits_per_coded_sample * st->codecpar->channels / 8;
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avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
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return 0;
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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 = ff_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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__VA_ARGS__ \
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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, .mime_type = "audio/L16")
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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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PCMDEF(vidc, "PCM Archimedes VIDC",
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NULL, AV_CODEC_ID_PCM_VIDC)
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static const AVOption sln_options[] = {
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{ "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 8000}, 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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static const AVClass sln_demuxer_class = {
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.class_name = "sln demuxer",
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.item_name = av_default_item_name,
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.option = sln_options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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AVInputFormat ff_sln_demuxer = {
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.name = "sln",
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.long_name = NULL_IF_CONFIG_SMALL("Asterisk raw pcm"),
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.priv_data_size = sizeof(PCMAudioDemuxerContext),
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.read_header = pcm_read_header,
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.read_packet = ff_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 = "sln",
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.raw_codec_id = AV_CODEC_ID_PCM_S16LE,
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.priv_class = &sln_demuxer_class,
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};
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