| /* | |
| * RIFF demuxing functions and data | |
| * Copyright (c) 2000 Fabrice Bellard | |
| * | |
| * This file is part of FFmpeg. | |
| * | |
| * FFmpeg is free software; you can redistribute it and/or | |
| * modify it under the terms of the GNU Lesser General Public | |
| * License as published by the Free Software Foundation; either | |
| * version 2.1 of the License, or (at your option) any later version. | |
| * | |
| * FFmpeg is distributed in the hope that it will be useful, | |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| * Lesser General Public License for more details. | |
| * | |
| * You should have received a copy of the GNU Lesser General Public | |
| * License along with FFmpeg; if not, write to the Free Software | |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| */ | |
| #include "libavutil/avassert.h" | |
| #include "libavutil/dict.h" | |
| #include "libavutil/error.h" | |
| #include "libavutil/intreadwrite.h" | |
| #include "libavutil/log.h" | |
| #include "avformat.h" | |
| #include "avio_internal.h" | |
| #include "demux.h" | |
| #include "riff.h" | |
| int ff_get_guid(AVIOContext *s, ff_asf_guid *g) | |
| { | |
| int ret; | |
| av_assert0(sizeof(*g) == 16); //compiler will optimize this out | |
| ret = ffio_read_size(s, *g, sizeof(*g)); | |
| if (ret < 0) { | |
| memset(*g, 0, sizeof(*g)); | |
| return ret; | |
| } | |
| return 0; | |
| } | |
| enum AVCodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid) | |
| { | |
| int i; | |
| for (i = 0; guids[i].id != AV_CODEC_ID_NONE; i++) | |
| if (!ff_guidcmp(guids[i].guid, guid)) | |
| return guids[i].id; | |
| return AV_CODEC_ID_NONE; | |
| } | |
| /* We could be given one of the three possible structures here: | |
| * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure | |
| * is an expansion of the previous one with the fields added | |
| * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and | |
| * WAVEFORMATEX adds 'WORD cbSize' and basically makes itself | |
| * an openended structure. | |
| */ | |
| static void parse_waveformatex(void *logctx, AVIOContext *pb, AVCodecParameters *par) | |
| { | |
| ff_asf_guid subformat; | |
| int bps; | |
| uint64_t mask; | |
| bps = avio_rl16(pb); | |
| if (bps) | |
| par->bits_per_coded_sample = bps; | |
| mask = avio_rl32(pb); /* dwChannelMask */ | |
| av_channel_layout_from_mask(&par->ch_layout, mask); | |
| ff_get_guid(pb, &subformat); | |
| if (!memcmp(subformat + 4, | |
| (const uint8_t[]){ FF_AMBISONIC_BASE_GUID }, 12) || | |
| !memcmp(subformat + 4, | |
| (const uint8_t[]){ FF_BROKEN_BASE_GUID }, 12) || | |
| !memcmp(subformat + 4, | |
| (const uint8_t[]){ FF_MEDIASUBTYPE_BASE_GUID }, 12)) { | |
| par->codec_tag = AV_RL32(subformat); | |
| par->codec_id = ff_wav_codec_get_id(par->codec_tag, | |
| par->bits_per_coded_sample); | |
| } else { | |
| par->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subformat); | |
| if (!par->codec_id) | |
| av_log(logctx, AV_LOG_WARNING, | |
| "unknown subformat:"FF_PRI_GUID"\n", | |
| FF_ARG_GUID(subformat)); | |
| } | |
| } | |
| /* "big_endian" values are needed for RIFX file format */ | |
| int ff_get_wav_header(void *logctx, AVIOContext *pb, | |
| AVCodecParameters *par, int size, int big_endian) | |
| { | |
| int id, channels = 0, ret; | |
| uint64_t bitrate = 0; | |
| if (size < 14) { | |
| avpriv_request_sample(logctx, "wav header size < 14"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| av_channel_layout_uninit(&par->ch_layout); | |
| par->codec_type = AVMEDIA_TYPE_AUDIO; | |
| if (!big_endian) { | |
| id = avio_rl16(pb); | |
| if (id != 0x0165) { | |
| channels = avio_rl16(pb); | |
| par->sample_rate = avio_rl32(pb); | |
| bitrate = avio_rl32(pb) * 8LL; | |
| par->block_align = avio_rl16(pb); | |
| } | |
| } else { | |
| id = avio_rb16(pb); | |
| channels = avio_rb16(pb); | |
| par->sample_rate = avio_rb32(pb); | |
| bitrate = avio_rb32(pb) * 8LL; | |
| par->block_align = avio_rb16(pb); | |
| } | |
| if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */ | |
| par->bits_per_coded_sample = 8; | |
| } else { | |
| if (!big_endian) { | |
| par->bits_per_coded_sample = avio_rl16(pb); | |
| } else { | |
| par->bits_per_coded_sample = avio_rb16(pb); | |
| } | |
| } | |
| if (id == 0xFFFE) { | |
| par->codec_tag = 0; | |
| } else { | |
| par->codec_tag = id; | |
| par->codec_id = ff_wav_codec_get_id(id, | |
| par->bits_per_coded_sample); | |
| } | |
| if (size >= 18 && id != 0x0165) { /* We're obviously dealing with WAVEFORMATEX */ | |
| int cbSize = avio_rl16(pb); /* cbSize */ | |
| if (big_endian) { | |
| avpriv_report_missing_feature(logctx, "WAVEFORMATEX support for RIFX files"); | |
| return AVERROR_PATCHWELCOME; | |
| } | |
| size -= 18; | |
| cbSize = FFMIN(size, cbSize); | |
| if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */ | |
| parse_waveformatex(logctx, pb, par); | |
| cbSize -= 22; | |
| size -= 22; | |
| } | |
| if (cbSize > 0) { | |
| ret = ff_get_extradata(logctx, par, pb, cbSize); | |
| if (ret < 0) | |
| return ret; | |
| size -= cbSize; | |
| } | |
| /* It is possible for the chunk to contain garbage at the end */ | |
| if (size > 0) | |
| avio_skip(pb, size); | |
| } else if (id == 0x0165 && size >= 32) { | |
| int nb_streams, i; | |
| size -= 4; | |
| ret = ff_get_extradata(logctx, par, pb, size); | |
| if (ret < 0) | |
| return ret; | |
| nb_streams = AV_RL16(par->extradata + 4); | |
| par->sample_rate = AV_RL32(par->extradata + 12); | |
| channels = 0; | |
| bitrate = 0; | |
| if (size < 8 + nb_streams * 20) | |
| return AVERROR_INVALIDDATA; | |
| for (i = 0; i < nb_streams; i++) | |
| channels += par->extradata[8 + i * 20 + 17]; | |
| } | |
| par->bit_rate = bitrate; | |
| if (par->sample_rate <= 0) { | |
| av_log(logctx, AV_LOG_ERROR, | |
| "Invalid sample rate: %d\n", par->sample_rate); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| if (par->codec_id == AV_CODEC_ID_AAC_LATM) { | |
| /* Channels and sample_rate values are those prior to applying SBR | |
| * and/or PS. */ | |
| channels = 0; | |
| par->sample_rate = 0; | |
| } | |
| /* override bits_per_coded_sample for G.726 */ | |
| if (par->codec_id == AV_CODEC_ID_ADPCM_G726 && par->sample_rate) | |
| par->bits_per_coded_sample = par->bit_rate / par->sample_rate; | |
| /* ignore WAVEFORMATEXTENSIBLE layout if different from channel count */ | |
| if (channels != par->ch_layout.nb_channels) { | |
| av_channel_layout_uninit(&par->ch_layout); | |
| par->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC; | |
| par->ch_layout.nb_channels = channels; | |
| } | |
| return 0; | |
| } | |
| enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps) | |
| { | |
| enum AVCodecID id; | |
| id = ff_codec_get_id(ff_codec_wav_tags, tag); | |
| if (id <= 0) | |
| return id; | |
| if (id == AV_CODEC_ID_PCM_S16LE) | |
| id = ff_get_pcm_codec_id(bps, 0, 0, ~1); | |
| else if (id == AV_CODEC_ID_PCM_F32LE) | |
| id = ff_get_pcm_codec_id(bps, 1, 0, 0); | |
| if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8) | |
| id = AV_CODEC_ID_ADPCM_ZORK; | |
| return id; | |
| } | |
| int ff_get_bmp_header(AVIOContext *pb, AVStream *st, uint32_t *size) | |
| { | |
| int tag1; | |
| uint32_t size_ = avio_rl32(pb); | |
| if (size) | |
| *size = size_; | |
| st->codecpar->width = avio_rl32(pb); | |
| st->codecpar->height = (int32_t)avio_rl32(pb); | |
| avio_rl16(pb); /* planes */ | |
| st->codecpar->bits_per_coded_sample = avio_rl16(pb); /* depth */ | |
| tag1 = avio_rl32(pb); | |
| avio_rl32(pb); /* ImageSize */ | |
| avio_rl32(pb); /* XPelsPerMeter */ | |
| avio_rl32(pb); /* YPelsPerMeter */ | |
| avio_rl32(pb); /* ClrUsed */ | |
| avio_rl32(pb); /* ClrImportant */ | |
| return tag1; | |
| } | |
| int ff_read_riff_info(AVFormatContext *s, int64_t size) | |
| { | |
| int64_t start, end, cur; | |
| AVIOContext *pb = s->pb; | |
| start = avio_tell(pb); | |
| end = start + size; | |
| while ((cur = avio_tell(pb)) >= 0 && | |
| cur <= end - 8 /* = tag + size */) { | |
| uint32_t chunk_code; | |
| int64_t chunk_size; | |
| char key[5] = { 0 }; | |
| char *value; | |
| chunk_code = avio_rl32(pb); | |
| chunk_size = avio_rl32(pb); | |
| if (avio_feof(pb)) { | |
| if (chunk_code || chunk_size) { | |
| av_log(s, AV_LOG_WARNING, "INFO subchunk truncated\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| return AVERROR_EOF; | |
| } | |
| if (chunk_size > end || | |
| end - chunk_size < cur || | |
| chunk_size == UINT_MAX) { | |
| avio_seek(pb, -9, SEEK_CUR); | |
| chunk_code = avio_rl32(pb); | |
| chunk_size = avio_rl32(pb); | |
| if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) { | |
| av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| } | |
| chunk_size += (chunk_size & 1); | |
| if (!chunk_code) { | |
| if (chunk_size) | |
| avio_skip(pb, chunk_size); | |
| else if (pb->eof_reached) { | |
| av_log(s, AV_LOG_WARNING, "truncated file\n"); | |
| return AVERROR_EOF; | |
| } | |
| continue; | |
| } | |
| value = av_mallocz(chunk_size + 1); | |
| if (!value) { | |
| av_log(s, AV_LOG_ERROR, | |
| "out of memory, unable to read INFO tag\n"); | |
| return AVERROR(ENOMEM); | |
| } | |
| AV_WL32(key, chunk_code); | |
| // Work around VC++ 2015 Update 1 code-gen bug: | |
| // https://connect.microsoft.com/VisualStudio/feedback/details/2291638 | |
| key[4] = 0; | |
| if (avio_read(pb, value, chunk_size) != chunk_size) { | |
| av_log(s, AV_LOG_WARNING, | |
| "premature end of file while reading INFO tag\n"); | |
| } | |
| av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL); | |
| } | |
| return 0; | |
| } |