mirror of
https://github.com/FFmpeg/FFmpeg.git
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230 lines
7.5 KiB
C
230 lines
7.5 KiB
C
/*
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* RIFF demuxing functions and data
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* Copyright (c) 2000 Fabrice Bellard
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "libavutil/dict.h"
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#include "libavutil/error.h"
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#include "libavutil/log.h"
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#include "libavutil/mathematics.h"
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#include "libavcodec/avcodec.h"
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#include "libavcodec/bytestream.h"
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#include "avformat.h"
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#include "avio_internal.h"
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#include "riff.h"
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const AVCodecGuid ff_codec_wav_guids[] = {
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{ AV_CODEC_ID_AC3, { 0x2C, 0x80, 0x6D, 0xE0, 0x46, 0xDB, 0xCF, 0x11, 0xB4, 0xD1, 0x00, 0x80, 0x5F, 0x6C, 0xBB, 0xEA } },
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{ AV_CODEC_ID_ATRAC3P, { 0xBF, 0xAA, 0x23, 0xE9, 0x58, 0xCB, 0x71, 0x44, 0xA1, 0x19, 0xFF, 0xFA, 0x01, 0xE4, 0xCE, 0x62 } },
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{ AV_CODEC_ID_EAC3, { 0xAF, 0x87, 0xFB, 0xA7, 0x02, 0x2D, 0xFB, 0x42, 0xA4, 0xD4, 0x05, 0xCD, 0x93, 0x84, 0x3B, 0xDD } },
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{ AV_CODEC_ID_MP2, { 0x2B, 0x80, 0x6D, 0xE0, 0x46, 0xDB, 0xCF, 0x11, 0xB4, 0xD1, 0x00, 0x80, 0x5F, 0x6C, 0xBB, 0xEA } },
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{ AV_CODEC_ID_NONE }
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};
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enum AVCodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
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{
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int i;
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for (i = 0; guids[i].id != AV_CODEC_ID_NONE; i++)
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if (!ff_guidcmp(guids[i].guid, guid))
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return guids[i].id;
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return AV_CODEC_ID_NONE;
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}
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/* We could be given one of the three possible structures here:
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* WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
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* is an expansion of the previous one with the fields added
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* at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
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* WAVEFORMATEX adds 'WORD cbSize' and basically makes itself
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* an openended structure.
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*/
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static void parse_waveformatex(AVIOContext *pb, AVCodecContext *c)
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{
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ff_asf_guid subformat;
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c->bits_per_coded_sample = avio_rl16(pb);
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c->channel_layout = avio_rl32(pb); /* dwChannelMask */
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ff_get_guid(pb, &subformat);
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if (!memcmp(subformat + 4,
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(const uint8_t[]){ FF_MEDIASUBTYPE_BASE_GUID }, 12)) {
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c->codec_tag = AV_RL32(subformat);
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c->codec_id = ff_wav_codec_get_id(c->codec_tag,
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c->bits_per_coded_sample);
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} else {
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c->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subformat);
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if (!c->codec_id)
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av_log(c, AV_LOG_WARNING,
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"unknown subformat:"FF_PRI_GUID"\n",
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FF_ARG_GUID(subformat));
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}
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}
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int ff_get_wav_header(AVIOContext *pb, AVCodecContext *codec, int size)
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{
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int id;
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id = avio_rl16(pb);
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codec->codec_type = AVMEDIA_TYPE_AUDIO;
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codec->channels = avio_rl16(pb);
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codec->sample_rate = avio_rl32(pb);
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codec->bit_rate = avio_rl32(pb) * 8;
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codec->block_align = avio_rl16(pb);
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if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
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codec->bits_per_coded_sample = 8;
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} else
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codec->bits_per_coded_sample = avio_rl16(pb);
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if (id == 0xFFFE) {
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codec->codec_tag = 0;
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} else {
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codec->codec_tag = id;
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codec->codec_id = ff_wav_codec_get_id(id,
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codec->bits_per_coded_sample);
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}
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if (size >= 18) { /* We're obviously dealing with WAVEFORMATEX */
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int cbSize = avio_rl16(pb); /* cbSize */
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size -= 18;
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cbSize = FFMIN(size, cbSize);
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if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
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parse_waveformatex(pb, codec);
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cbSize -= 22;
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size -= 22;
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}
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codec->extradata_size = cbSize;
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if (cbSize > 0) {
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av_free(codec->extradata);
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codec->extradata = av_mallocz(codec->extradata_size +
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FF_INPUT_BUFFER_PADDING_SIZE);
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if (!codec->extradata)
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return AVERROR(ENOMEM);
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avio_read(pb, codec->extradata, codec->extradata_size);
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size -= cbSize;
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}
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/* It is possible for the chunk to contain garbage at the end */
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if (size > 0)
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avio_skip(pb, size);
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}
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if (codec->codec_id == AV_CODEC_ID_AAC_LATM) {
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/* Channels and sample_rate values are those prior to applying SBR
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* and/or PS. */
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codec->channels = 0;
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codec->sample_rate = 0;
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}
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/* override bits_per_coded_sample for G.726 */
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if (codec->codec_id == AV_CODEC_ID_ADPCM_G726)
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codec->bits_per_coded_sample = codec->bit_rate / codec->sample_rate;
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return 0;
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}
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enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
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{
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enum AVCodecID id;
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id = ff_codec_get_id(ff_codec_wav_tags, tag);
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if (id <= 0)
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return id;
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if (id == AV_CODEC_ID_PCM_S16LE)
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id = ff_get_pcm_codec_id(bps, 0, 0, ~1);
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else if (id == AV_CODEC_ID_PCM_F32LE)
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id = ff_get_pcm_codec_id(bps, 1, 0, 0);
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if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
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id = AV_CODEC_ID_PCM_ZORK;
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return id;
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}
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int ff_get_bmp_header(AVIOContext *pb, AVStream *st)
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{
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int tag1;
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avio_rl32(pb); /* size */
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st->codec->width = avio_rl32(pb);
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st->codec->height = (int32_t)avio_rl32(pb);
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avio_rl16(pb); /* planes */
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st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */
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tag1 = avio_rl32(pb);
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avio_rl32(pb); /* ImageSize */
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avio_rl32(pb); /* XPelsPerMeter */
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avio_rl32(pb); /* YPelsPerMeter */
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avio_rl32(pb); /* ClrUsed */
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avio_rl32(pb); /* ClrImportant */
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return tag1;
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}
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int ff_read_riff_info(AVFormatContext *s, int64_t size)
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{
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int64_t start, end, cur;
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AVIOContext *pb = s->pb;
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start = avio_tell(pb);
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end = start + size;
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while ((cur = avio_tell(pb)) >= 0 &&
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cur <= end - 8 /* = tag + size */) {
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uint32_t chunk_code;
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int64_t chunk_size;
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char key[5] = { 0 };
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char *value;
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chunk_code = avio_rl32(pb);
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chunk_size = avio_rl32(pb);
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if (chunk_size > end ||
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end - chunk_size < cur ||
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chunk_size == UINT_MAX) {
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av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
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break;
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}
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chunk_size += (chunk_size & 1);
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if (!chunk_code) {
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if (chunk_size)
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avio_skip(pb, chunk_size);
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else if (pb->eof_reached) {
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av_log(s, AV_LOG_WARNING, "truncated file\n");
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return AVERROR_EOF;
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}
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continue;
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}
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value = av_malloc(chunk_size + 1);
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if (!value) {
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av_log(s, AV_LOG_ERROR,
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"out of memory, unable to read INFO tag\n");
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return AVERROR(ENOMEM);
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}
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AV_WL32(key, chunk_code);
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if (avio_read(pb, value, chunk_size) != chunk_size) {
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av_free(value);
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av_log(s, AV_LOG_WARNING,
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"premature end of file while reading INFO tag\n");
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break;
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}
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value[chunk_size] = 0;
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av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
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}
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return 0;
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}
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