| 1 | /* |
| 2 | * RIFF demuxing functions and data |
| 3 | * Copyright (c) 2000 Fabrice Bellard |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | #include "libavutil/dict.h" |
| 23 | #include "libavutil/error.h" |
| 24 | #include "libavutil/log.h" |
| 25 | #include "libavutil/mathematics.h" |
| 26 | #include "libavcodec/avcodec.h" |
| 27 | #include "libavcodec/bytestream.h" |
| 28 | #include "avformat.h" |
| 29 | #include "avio_internal.h" |
| 30 | #include "riff.h" |
| 31 | |
| 32 | int ff_get_guid(AVIOContext *s, ff_asf_guid *g) |
| 33 | { |
| 34 | av_assert0(sizeof(*g) == 16); //compiler will optimize this out |
| 35 | if (avio_read(s, *g, sizeof(*g)) < (int)sizeof(*g)) { |
| 36 | memset(*g, 0, sizeof(*g)); |
| 37 | return AVERROR_INVALIDDATA; |
| 38 | } |
| 39 | return 0; |
| 40 | } |
| 41 | |
| 42 | enum AVCodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid) |
| 43 | { |
| 44 | int i; |
| 45 | for (i = 0; guids[i].id != AV_CODEC_ID_NONE; i++) |
| 46 | if (!ff_guidcmp(guids[i].guid, guid)) |
| 47 | return guids[i].id; |
| 48 | return AV_CODEC_ID_NONE; |
| 49 | } |
| 50 | |
| 51 | /* We could be given one of the three possible structures here: |
| 52 | * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure |
| 53 | * is an expansion of the previous one with the fields added |
| 54 | * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and |
| 55 | * WAVEFORMATEX adds 'WORD cbSize' and basically makes itself |
| 56 | * an openended structure. |
| 57 | */ |
| 58 | |
| 59 | static void parse_waveformatex(AVIOContext *pb, AVCodecContext *c) |
| 60 | { |
| 61 | ff_asf_guid subformat; |
| 62 | int bps = avio_rl16(pb); |
| 63 | if (bps) |
| 64 | c->bits_per_coded_sample = bps; |
| 65 | |
| 66 | c->channel_layout = avio_rl32(pb); /* dwChannelMask */ |
| 67 | |
| 68 | ff_get_guid(pb, &subformat); |
| 69 | if (!memcmp(subformat + 4, |
| 70 | (const uint8_t[]){ FF_MEDIASUBTYPE_BASE_GUID }, 12)) { |
| 71 | c->codec_tag = AV_RL32(subformat); |
| 72 | c->codec_id = ff_wav_codec_get_id(c->codec_tag, |
| 73 | c->bits_per_coded_sample); |
| 74 | } else { |
| 75 | c->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subformat); |
| 76 | if (!c->codec_id) |
| 77 | av_log(c, AV_LOG_WARNING, |
| 78 | "unknown subformat:"FF_PRI_GUID"\n", |
| 79 | FF_ARG_GUID(subformat)); |
| 80 | } |
| 81 | } |
| 82 | |
| 83 | int ff_get_wav_header(AVIOContext *pb, AVCodecContext *codec, int size) |
| 84 | { |
| 85 | int id; |
| 86 | |
| 87 | id = avio_rl16(pb); |
| 88 | codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| 89 | codec->channels = avio_rl16(pb); |
| 90 | codec->sample_rate = avio_rl32(pb); |
| 91 | codec->bit_rate = avio_rl32(pb) * 8; |
| 92 | codec->block_align = avio_rl16(pb); |
| 93 | if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */ |
| 94 | codec->bits_per_coded_sample = 8; |
| 95 | } else |
| 96 | codec->bits_per_coded_sample = avio_rl16(pb); |
| 97 | if (id == 0xFFFE) { |
| 98 | codec->codec_tag = 0; |
| 99 | } else { |
| 100 | codec->codec_tag = id; |
| 101 | codec->codec_id = ff_wav_codec_get_id(id, |
| 102 | codec->bits_per_coded_sample); |
| 103 | } |
| 104 | if (size >= 18) { /* We're obviously dealing with WAVEFORMATEX */ |
| 105 | int cbSize = avio_rl16(pb); /* cbSize */ |
| 106 | size -= 18; |
| 107 | cbSize = FFMIN(size, cbSize); |
| 108 | if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */ |
| 109 | parse_waveformatex(pb, codec); |
| 110 | cbSize -= 22; |
| 111 | size -= 22; |
| 112 | } |
| 113 | if (cbSize > 0) { |
| 114 | av_free(codec->extradata); |
| 115 | if (ff_get_extradata(codec, pb, cbSize) < 0) |
| 116 | return AVERROR(ENOMEM); |
| 117 | size -= cbSize; |
| 118 | } |
| 119 | |
| 120 | /* It is possible for the chunk to contain garbage at the end */ |
| 121 | if (size > 0) |
| 122 | avio_skip(pb, size); |
| 123 | } |
| 124 | if (codec->sample_rate <= 0) { |
| 125 | av_log(NULL, AV_LOG_ERROR, |
| 126 | "Invalid sample rate: %d\n", codec->sample_rate); |
| 127 | return AVERROR_INVALIDDATA; |
| 128 | } |
| 129 | if (codec->codec_id == AV_CODEC_ID_AAC_LATM) { |
| 130 | /* Channels and sample_rate values are those prior to applying SBR |
| 131 | * and/or PS. */ |
| 132 | codec->channels = 0; |
| 133 | codec->sample_rate = 0; |
| 134 | } |
| 135 | /* override bits_per_coded_sample for G.726 */ |
| 136 | if (codec->codec_id == AV_CODEC_ID_ADPCM_G726 && codec->sample_rate) |
| 137 | codec->bits_per_coded_sample = codec->bit_rate / codec->sample_rate; |
| 138 | |
| 139 | return 0; |
| 140 | } |
| 141 | |
| 142 | enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps) |
| 143 | { |
| 144 | enum AVCodecID id; |
| 145 | id = ff_codec_get_id(ff_codec_wav_tags, tag); |
| 146 | if (id <= 0) |
| 147 | return id; |
| 148 | |
| 149 | if (id == AV_CODEC_ID_PCM_S16LE) |
| 150 | id = ff_get_pcm_codec_id(bps, 0, 0, ~1); |
| 151 | else if (id == AV_CODEC_ID_PCM_F32LE) |
| 152 | id = ff_get_pcm_codec_id(bps, 1, 0, 0); |
| 153 | |
| 154 | if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8) |
| 155 | id = AV_CODEC_ID_PCM_ZORK; |
| 156 | return id; |
| 157 | } |
| 158 | |
| 159 | int ff_get_bmp_header(AVIOContext *pb, AVStream *st, unsigned *esize) |
| 160 | { |
| 161 | int tag1; |
| 162 | if(esize) *esize = avio_rl32(pb); |
| 163 | else avio_rl32(pb); |
| 164 | st->codec->width = avio_rl32(pb); |
| 165 | st->codec->height = (int32_t)avio_rl32(pb); |
| 166 | avio_rl16(pb); /* planes */ |
| 167 | st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */ |
| 168 | tag1 = avio_rl32(pb); |
| 169 | avio_rl32(pb); /* ImageSize */ |
| 170 | avio_rl32(pb); /* XPelsPerMeter */ |
| 171 | avio_rl32(pb); /* YPelsPerMeter */ |
| 172 | avio_rl32(pb); /* ClrUsed */ |
| 173 | avio_rl32(pb); /* ClrImportant */ |
| 174 | return tag1; |
| 175 | } |
| 176 | |
| 177 | int ff_read_riff_info(AVFormatContext *s, int64_t size) |
| 178 | { |
| 179 | int64_t start, end, cur; |
| 180 | AVIOContext *pb = s->pb; |
| 181 | |
| 182 | start = avio_tell(pb); |
| 183 | end = start + size; |
| 184 | |
| 185 | while ((cur = avio_tell(pb)) >= 0 && |
| 186 | cur <= end - 8 /* = tag + size */) { |
| 187 | uint32_t chunk_code; |
| 188 | int64_t chunk_size; |
| 189 | char key[5] = { 0 }; |
| 190 | char *value; |
| 191 | |
| 192 | chunk_code = avio_rl32(pb); |
| 193 | chunk_size = avio_rl32(pb); |
| 194 | if (avio_feof(pb)) { |
| 195 | if (chunk_code || chunk_size) { |
| 196 | av_log(s, AV_LOG_WARNING, "INFO subchunk truncated\n"); |
| 197 | return AVERROR_INVALIDDATA; |
| 198 | } |
| 199 | return AVERROR_EOF; |
| 200 | } |
| 201 | if (chunk_size > end || |
| 202 | end - chunk_size < cur || |
| 203 | chunk_size == UINT_MAX) { |
| 204 | avio_seek(pb, -9, SEEK_CUR); |
| 205 | chunk_code = avio_rl32(pb); |
| 206 | chunk_size = avio_rl32(pb); |
| 207 | if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) { |
| 208 | av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n"); |
| 209 | return AVERROR_INVALIDDATA; |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | chunk_size += (chunk_size & 1); |
| 214 | |
| 215 | if (!chunk_code) { |
| 216 | if (chunk_size) |
| 217 | avio_skip(pb, chunk_size); |
| 218 | else if (pb->eof_reached) { |
| 219 | av_log(s, AV_LOG_WARNING, "truncated file\n"); |
| 220 | return AVERROR_EOF; |
| 221 | } |
| 222 | continue; |
| 223 | } |
| 224 | |
| 225 | value = av_mallocz(chunk_size + 1); |
| 226 | if (!value) { |
| 227 | av_log(s, AV_LOG_ERROR, |
| 228 | "out of memory, unable to read INFO tag\n"); |
| 229 | return AVERROR(ENOMEM); |
| 230 | } |
| 231 | |
| 232 | AV_WL32(key, chunk_code); |
| 233 | |
| 234 | if (avio_read(pb, value, chunk_size) != chunk_size) { |
| 235 | av_log(s, AV_LOG_WARNING, |
| 236 | "premature end of file while reading INFO tag\n"); |
| 237 | } |
| 238 | |
| 239 | av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL); |
| 240 | } |
| 241 | |
| 242 | return 0; |
| 243 | } |