| /* |
| * 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/dict.h" |
| #include "libavutil/error.h" |
| #include "libavutil/log.h" |
| #include "libavutil/mathematics.h" |
| #include "libavcodec/avcodec.h" |
| #include "libavcodec/bytestream.h" |
| #include "avformat.h" |
| #include "avio_internal.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 = avio_read(s, *g, sizeof(*g)); |
| if (ret < (int)sizeof(*g)) { |
| memset(*g, 0, sizeof(*g)); |
| return ret < 0 ? ret : AVERROR_INVALIDDATA; |
| } |
| 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(AVIOContext *pb, AVCodecContext *c) |
| { |
| ff_asf_guid subformat; |
| int bps = avio_rl16(pb); |
| if (bps) |
| c->bits_per_coded_sample = bps; |
| |
| c->channel_layout = avio_rl32(pb); /* dwChannelMask */ |
| |
| ff_get_guid(pb, &subformat); |
| if (!memcmp(subformat + 4, |
| (const uint8_t[]){ FF_AMBISONIC_BASE_GUID }, 12) || |
| !memcmp(subformat + 4, |
| (const uint8_t[]){ FF_MEDIASUBTYPE_BASE_GUID }, 12)) { |
| c->codec_tag = AV_RL32(subformat); |
| c->codec_id = ff_wav_codec_get_id(c->codec_tag, |
| c->bits_per_coded_sample); |
| } else { |
| c->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subformat); |
| if (!c->codec_id) |
| av_log(c, 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(AVFormatContext *s, AVIOContext *pb, |
| AVCodecContext *codec, int size, int big_endian) |
| { |
| int id; |
| uint64_t bitrate = 0; |
| |
| if (size < 14) { |
| avpriv_request_sample(codec, "wav header size < 14"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| if (!big_endian) { |
| id = avio_rl16(pb); |
| if (id != 0x0165) { |
| codec->channels = avio_rl16(pb); |
| codec->sample_rate = avio_rl32(pb); |
| bitrate = avio_rl32(pb) * 8LL; |
| codec->block_align = avio_rl16(pb); |
| } |
| } else { |
| id = avio_rb16(pb); |
| codec->channels = avio_rb16(pb); |
| codec->sample_rate = avio_rb32(pb); |
| bitrate = avio_rb32(pb) * 8LL; |
| codec->block_align = avio_rb16(pb); |
| } |
| if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */ |
| codec->bits_per_coded_sample = 8; |
| } else { |
| if (!big_endian) { |
| codec->bits_per_coded_sample = avio_rl16(pb); |
| } else { |
| codec->bits_per_coded_sample = avio_rb16(pb); |
| } |
| } |
| if (id == 0xFFFE) { |
| codec->codec_tag = 0; |
| } else { |
| codec->codec_tag = id; |
| codec->codec_id = ff_wav_codec_get_id(id, |
| codec->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(codec, "WAVEFORMATEX support for RIFX files\n"); |
| return AVERROR_PATCHWELCOME; |
| } |
| size -= 18; |
| cbSize = FFMIN(size, cbSize); |
| if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */ |
| parse_waveformatex(pb, codec); |
| cbSize -= 22; |
| size -= 22; |
| } |
| if (cbSize > 0) { |
| av_freep(&codec->extradata); |
| if (ff_get_extradata(codec, pb, cbSize) < 0) |
| return AVERROR(ENOMEM); |
| 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; |
| av_freep(&codec->extradata); |
| if (ff_get_extradata(codec, pb, size) < 0) |
| return AVERROR(ENOMEM); |
| nb_streams = AV_RL16(codec->extradata + 4); |
| codec->sample_rate = AV_RL32(codec->extradata + 12); |
| codec->channels = 0; |
| bitrate = 0; |
| if (size < 8 + nb_streams * 20) |
| return AVERROR_INVALIDDATA; |
| for (i = 0; i < nb_streams; i++) |
| codec->channels += codec->extradata[8 + i * 20 + 17]; |
| } |
| |
| codec->bit_rate = bitrate; |
| |
| if (codec->sample_rate <= 0) { |
| av_log(s, AV_LOG_ERROR, |
| "Invalid sample rate: %d\n", codec->sample_rate); |
| return AVERROR_INVALIDDATA; |
| } |
| if (codec->codec_id == AV_CODEC_ID_AAC_LATM) { |
| /* Channels and sample_rate values are those prior to applying SBR |
| * and/or PS. */ |
| codec->channels = 0; |
| codec->sample_rate = 0; |
| } |
| /* override bits_per_coded_sample for G.726 */ |
| if (codec->codec_id == AV_CODEC_ID_ADPCM_G726 && codec->sample_rate) |
| codec->bits_per_coded_sample = codec->bit_rate / codec->sample_rate; |
| |
| 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_PCM_ZORK; |
| return id; |
| } |
| |
| int ff_get_bmp_header(AVIOContext *pb, AVStream *st, unsigned *esize) |
| { |
| int tag1; |
| if(esize) *esize = avio_rl32(pb); |
| else avio_rl32(pb); |
| st->codec->width = avio_rl32(pb); |
| st->codec->height = (int32_t)avio_rl32(pb); |
| avio_rl16(pb); /* planes */ |
| st->codec->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; |
| } |
