/* * RIFF demuxing functions and data * Copyright (c) 2000 Fabrice Bellard * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; 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" const AVCodecGuid ff_codec_wav_guids[] = { { AV_CODEC_ID_AC3, { 0x2C, 0x80, 0x6D, 0xE0, 0x46, 0xDB, 0xCF, 0x11, 0xB4, 0xD1, 0x00, 0x80, 0x5F, 0x6C, 0xBB, 0xEA } }, { AV_CODEC_ID_ATRAC3P, { 0xBF, 0xAA, 0x23, 0xE9, 0x58, 0xCB, 0x71, 0x44, 0xA1, 0x19, 0xFF, 0xFA, 0x01, 0xE4, 0xCE, 0x62 } }, { AV_CODEC_ID_EAC3, { 0xAF, 0x87, 0xFB, 0xA7, 0x02, 0x2D, 0xFB, 0x42, 0xA4, 0xD4, 0x05, 0xCD, 0x93, 0x84, 0x3B, 0xDD } }, { AV_CODEC_ID_MP2, { 0x2B, 0x80, 0x6D, 0xE0, 0x46, 0xDB, 0xCF, 0x11, 0xB4, 0xD1, 0x00, 0x80, 0x5F, 0x6C, 0xBB, 0xEA } }, { AV_CODEC_ID_NONE } }; 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, AVCodecParameters *par) { ff_asf_guid subformat; par->bits_per_coded_sample = avio_rl16(pb); par->channel_layout = avio_rl32(pb); /* dwChannelMask */ ff_get_guid(pb, &subformat); if (!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(pb, AV_LOG_WARNING, "unknown subformat:"FF_PRI_GUID"\n", FF_ARG_GUID(subformat)); } } int ff_get_wav_header(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par, int size) { int id; uint64_t bitrate; if (size < 14) return AVERROR_INVALIDDATA; id = avio_rl16(pb); par->codec_type = AVMEDIA_TYPE_AUDIO; par->channels = avio_rl16(pb); par->sample_rate = avio_rl32(pb); bitrate = avio_rl32(pb) * 8; par->block_align = avio_rl16(pb); if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */ par->bits_per_coded_sample = 8; } else par->bits_per_coded_sample = avio_rl16(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) { /* We're obviously dealing with WAVEFORMATEX */ int cbSize = avio_rl16(pb); /* cbSize */ size -= 18; cbSize = FFMIN(size, cbSize); if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */ parse_waveformatex(pb, par); cbSize -= 22; size -= 22; } par->extradata_size = cbSize; if (cbSize > 0) { av_free(par->extradata); par->extradata = av_mallocz(par->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE); if (!par->extradata) return AVERROR(ENOMEM); avio_read(pb, par->extradata, par->extradata_size); size -= cbSize; } /* It is possible for the chunk to contain garbage at the end */ if (size > 0) avio_skip(pb, size); } if (bitrate > INT_MAX) { if (s->error_recognition & AV_EF_EXPLODE) { av_log(s, AV_LOG_ERROR, "The bitrate %"PRIu64" is too large.\n", bitrate); return AVERROR_INVALIDDATA; } else { av_log(s, AV_LOG_WARNING, "The bitrate %"PRIu64" is too large, resetting to 0.", bitrate); par->bit_rate = 0; } } else { par->bit_rate = bitrate; } if (par->sample_rate <= 0) { av_log(s, 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. */ par->channels = 0; par->sample_rate = 0; } /* override bits_per_coded_sample for G.726 */ if (par->codec_id == AV_CODEC_ID_ADPCM_G726) par->bits_per_coded_sample = par->bit_rate / par->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) { int tag1; avio_rl32(pb); /* 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 (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) { av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n"); break; } 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_malloc(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); if (avio_read(pb, value, chunk_size) != chunk_size) { av_free(value); av_log(s, AV_LOG_WARNING, "premature end of file while reading INFO tag\n"); break; } value[chunk_size] = 0; av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL); } return 0; }