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https://github.com/FFmpeg/FFmpeg.git
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790f793844
There are lots of files that don't need it: The number of object files that actually need it went down from 2011 to 884 here. Keep it for external users in order to not cause breakages. Also improve the other headers a bit while just at it. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
313 lines
9.9 KiB
C
313 lines
9.9 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 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 "libavutil/avassert.h"
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#include "libavutil/dict.h"
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#include "libavutil/error.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/log.h"
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#include "libavutil/mem.h"
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#include "avformat.h"
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#include "avio_internal.h"
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#include "demux.h"
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#include "riff.h"
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int ff_get_guid(AVIOContext *s, ff_asf_guid *g)
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{
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int ret;
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av_assert0(sizeof(*g) == 16); //compiler will optimize this out
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ret = ffio_read_size(s, *g, sizeof(*g));
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if (ret < 0) {
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memset(*g, 0, sizeof(*g));
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return ret;
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}
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return 0;
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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(void *logctx, AVIOContext *pb, AVCodecParameters *par)
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{
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ff_asf_guid subformat;
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int bps;
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uint64_t mask;
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bps = avio_rl16(pb);
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if (bps)
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par->bits_per_coded_sample = bps;
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mask = avio_rl32(pb); /* dwChannelMask */
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av_channel_layout_from_mask(&par->ch_layout, mask);
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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_AMBISONIC_BASE_GUID }, 12) ||
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!memcmp(subformat + 4,
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(const uint8_t[]){ FF_BROKEN_BASE_GUID }, 12) ||
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!memcmp(subformat + 4,
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(const uint8_t[]){ FF_MEDIASUBTYPE_BASE_GUID }, 12)) {
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par->codec_tag = AV_RL32(subformat);
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par->codec_id = ff_wav_codec_get_id(par->codec_tag,
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par->bits_per_coded_sample);
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} else {
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par->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subformat);
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if (!par->codec_id)
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av_log(logctx, 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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/* "big_endian" values are needed for RIFX file format */
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int ff_get_wav_header(void *logctx, AVIOContext *pb,
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AVCodecParameters *par, int size, int big_endian)
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{
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int id, channels = 0, ret;
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uint64_t bitrate = 0;
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if (size < 14) {
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avpriv_request_sample(logctx, "wav header size < 14");
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return AVERROR_INVALIDDATA;
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}
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av_channel_layout_uninit(&par->ch_layout);
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par->codec_type = AVMEDIA_TYPE_AUDIO;
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if (!big_endian) {
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id = avio_rl16(pb);
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if (id != 0x0165) {
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channels = avio_rl16(pb);
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par->sample_rate = avio_rl32(pb);
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bitrate = avio_rl32(pb) * 8LL;
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par->block_align = avio_rl16(pb);
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}
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} else {
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id = avio_rb16(pb);
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channels = avio_rb16(pb);
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par->sample_rate = avio_rb32(pb);
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bitrate = avio_rb32(pb) * 8LL;
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par->block_align = avio_rb16(pb);
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}
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if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
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par->bits_per_coded_sample = 8;
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} else {
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if (!big_endian) {
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par->bits_per_coded_sample = avio_rl16(pb);
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} else {
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par->bits_per_coded_sample = avio_rb16(pb);
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}
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}
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if (id == 0xFFFE) {
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par->codec_tag = 0;
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} else {
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par->codec_tag = id;
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par->codec_id = ff_wav_codec_get_id(id,
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par->bits_per_coded_sample);
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}
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if (size >= 18 && id != 0x0165) { /* We're obviously dealing with WAVEFORMATEX */
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int cbSize = avio_rl16(pb); /* cbSize */
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if (big_endian) {
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avpriv_report_missing_feature(logctx, "WAVEFORMATEX support for RIFX files");
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return AVERROR_PATCHWELCOME;
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}
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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(logctx, pb, par);
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cbSize -= 22;
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size -= 22;
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}
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if (cbSize > 0) {
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ret = ff_get_extradata(logctx, par, pb, cbSize);
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if (ret < 0)
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return ret;
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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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} else if (id == 0x0165 && size >= 32) {
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int nb_streams, i;
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size -= 4;
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ret = ff_get_extradata(logctx, par, pb, size);
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if (ret < 0)
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return ret;
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nb_streams = AV_RL16(par->extradata + 4);
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par->sample_rate = AV_RL32(par->extradata + 12);
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channels = 0;
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bitrate = 0;
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if (size < 8 + nb_streams * 20)
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return AVERROR_INVALIDDATA;
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for (i = 0; i < nb_streams; i++)
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channels += par->extradata[8 + i * 20 + 17];
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}
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par->bit_rate = bitrate;
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if (par->sample_rate <= 0) {
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av_log(logctx, AV_LOG_ERROR,
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"Invalid sample rate: %d\n", par->sample_rate);
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return AVERROR_INVALIDDATA;
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}
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if (par->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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channels = 0;
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par->sample_rate = 0;
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}
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/* override bits_per_coded_sample for G.726 */
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if (par->codec_id == AV_CODEC_ID_ADPCM_G726 && par->sample_rate)
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par->bits_per_coded_sample = par->bit_rate / par->sample_rate;
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/* ignore WAVEFORMATEXTENSIBLE layout if different from channel count */
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if (channels != par->ch_layout.nb_channels) {
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av_channel_layout_uninit(&par->ch_layout);
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par->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
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par->ch_layout.nb_channels = channels;
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}
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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_ADPCM_ZORK;
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return id;
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}
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int ff_get_bmp_header(AVIOContext *pb, AVStream *st, uint32_t *size)
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{
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int tag1;
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uint32_t size_ = avio_rl32(pb);
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if (size)
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*size = size_;
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st->codecpar->width = avio_rl32(pb);
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st->codecpar->height = (int32_t)avio_rl32(pb);
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avio_rl16(pb); /* planes */
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st->codecpar->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 (avio_feof(pb)) {
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if (chunk_code || chunk_size) {
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av_log(s, AV_LOG_WARNING, "INFO subchunk truncated\n");
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return AVERROR_INVALIDDATA;
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}
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return AVERROR_EOF;
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}
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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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avio_seek(pb, -9, SEEK_CUR);
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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 || end - chunk_size < cur || chunk_size == UINT_MAX) {
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av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
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return AVERROR_INVALIDDATA;
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}
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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_mallocz(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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// Work around VC++ 2015 Update 1 code-gen bug:
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// https://connect.microsoft.com/VisualStudio/feedback/details/2291638
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key[4] = 0;
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if (avio_read(pb, value, chunk_size) != chunk_size) {
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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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}
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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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