| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * codec2 muxer and demuxers | ||
| 3 | * Copyright (c) 2017 Tomas Härdin | ||
| 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 "config_components.h" | ||
| 23 | |||
| 24 | #include "libavcodec/codec2utils.h" | ||
| 25 | #include "libavutil/channel_layout.h" | ||
| 26 | #include "libavutil/intreadwrite.h" | ||
| 27 | #include "libavutil/opt.h" | ||
| 28 | #include "avio_internal.h" | ||
| 29 | #include "avformat.h" | ||
| 30 | #include "demux.h" | ||
| 31 | #include "internal.h" | ||
| 32 | #include "mux.h" | ||
| 33 | #include "rawenc.h" | ||
| 34 | #include "pcm.h" | ||
| 35 | |||
| 36 | #define CODEC2_HEADER_SIZE 7 | ||
| 37 | #define CODEC2_MAGIC 0xC0DEC2 | ||
| 38 | |||
| 39 | //the lowest version we should ever run across is 0.8 | ||
| 40 | //we may run across later versions as the format evolves | ||
| 41 | #define EXPECTED_CODEC2_MAJOR_VERSION 0 | ||
| 42 | #define EXPECTED_CODEC2_MINOR_VERSION 8 | ||
| 43 | |||
| 44 | typedef struct { | ||
| 45 | const AVClass *class; | ||
| 46 | int mode; | ||
| 47 | int frames_per_packet; | ||
| 48 | } Codec2Context; | ||
| 49 | |||
| 50 | 7186 | static int codec2_probe(const AVProbeData *p) | |
| 51 | { | ||
| 52 | //must start wih C0 DE C2 | ||
| 53 |
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7186 | if (AV_RB24(p->buf) != CODEC2_MAGIC) { |
| 54 | 7186 | return 0; | |
| 55 | } | ||
| 56 | |||
| 57 | //no .c2 files prior to 0.8 | ||
| 58 | //be strict about major version while we're at it | ||
| 59 | ✗ | if (p->buf[3] != EXPECTED_CODEC2_MAJOR_VERSION || | |
| 60 | ✗ | p->buf[4] < EXPECTED_CODEC2_MINOR_VERSION) { | |
| 61 | ✗ | return 0; | |
| 62 | } | ||
| 63 | |||
| 64 | //32 bits of identification -> low score | ||
| 65 | ✗ | return AVPROBE_SCORE_EXTENSION + 1; | |
| 66 | } | ||
| 67 | |||
| 68 | //Mimics codec2_samples_per_frame() | ||
| 69 | ✗ | static int codec2_mode_frame_size(AVFormatContext *s, int mode) | |
| 70 | { | ||
| 71 | ✗ | int frame_size_table[CODEC2_MODE_MAX+1] = { | |
| 72 | 160, // 3200 | ||
| 73 | 160, // 2400 | ||
| 74 | 320, // 1600 | ||
| 75 | 320, // 1400 | ||
| 76 | 320, // 1300 | ||
| 77 | 320, // 1200 | ||
| 78 | 320, // 700 | ||
| 79 | 320, // 700B | ||
| 80 | 320, // 700C | ||
| 81 | }; | ||
| 82 | |||
| 83 | ✗ | if (mode < 0 || mode > CODEC2_MODE_MAX) { | |
| 84 | ✗ | av_log(s, AV_LOG_ERROR, "unknown codec2 mode %i, can't find frame_size\n", mode); | |
| 85 | ✗ | return 0; | |
| 86 | } else { | ||
| 87 | ✗ | return frame_size_table[mode]; | |
| 88 | } | ||
| 89 | } | ||
| 90 | |||
| 91 | //Mimics (codec2_bits_per_frame()+7)/8 | ||
| 92 | ✗ | static int codec2_mode_block_align(AVFormatContext *s, int mode) | |
| 93 | { | ||
| 94 | ✗ | int block_align_table[CODEC2_MODE_MAX+1] = { | |
| 95 | 8, // 3200 | ||
| 96 | 6, // 2400 | ||
| 97 | 8, // 1600 | ||
| 98 | 7, // 1400 | ||
| 99 | 7, // 1300 | ||
| 100 | 6, // 1200 | ||
| 101 | 4, // 700 | ||
| 102 | 4, // 700B | ||
| 103 | 4, // 700C | ||
| 104 | }; | ||
| 105 | |||
| 106 | ✗ | if (mode < 0 || mode > CODEC2_MODE_MAX) { | |
| 107 | ✗ | av_log(s, AV_LOG_ERROR, "unknown codec2 mode %i, can't find block_align\n", mode); | |
| 108 | ✗ | return 0; | |
| 109 | } else { | ||
| 110 | ✗ | return block_align_table[mode]; | |
| 111 | } | ||
| 112 | } | ||
| 113 | |||
| 114 | //Computes bitrate from mode, with frames rounded up to the nearest octet. | ||
| 115 | //So 700 bit/s (28 bits/frame) becomes 800 bits/s (32 bits/frame). | ||
| 116 | ✗ | static int codec2_mode_bit_rate(AVFormatContext *s, int mode) | |
| 117 | { | ||
| 118 | ✗ | int frame_size = codec2_mode_frame_size(s, mode); | |
| 119 | ✗ | int block_align = codec2_mode_block_align(s, mode); | |
| 120 | |||
| 121 | ✗ | if (frame_size <= 0 || block_align <= 0) { | |
| 122 | ✗ | return 0; | |
| 123 | } | ||
| 124 | |||
| 125 | ✗ | return 8 * 8000 * block_align / frame_size; | |
| 126 | } | ||
| 127 | |||
| 128 | ✗ | static int codec2_read_header_common(AVFormatContext *s, AVStream *st) | |
| 129 | { | ||
| 130 | ✗ | int mode = codec2_mode_from_extradata(st->codecpar->extradata); | |
| 131 | |||
| 132 | ✗ | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 133 | ✗ | st->codecpar->codec_id = AV_CODEC_ID_CODEC2; | |
| 134 | ✗ | st->codecpar->sample_rate = 8000; | |
| 135 | ✗ | st->codecpar->format = AV_SAMPLE_FMT_S16; | |
| 136 | ✗ | st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO; | |
| 137 | ✗ | st->codecpar->bit_rate = codec2_mode_bit_rate(s, mode); | |
| 138 | ✗ | st->codecpar->frame_size = codec2_mode_frame_size(s, mode); | |
| 139 | ✗ | st->codecpar->block_align = codec2_mode_block_align(s, mode); | |
| 140 | |||
| 141 | ✗ | if (st->codecpar->bit_rate <= 0 || | |
| 142 | ✗ | st->codecpar->frame_size <= 0 || | |
| 143 | ✗ | st->codecpar->block_align <= 0) { | |
| 144 | ✗ | return AVERROR_INVALIDDATA; | |
| 145 | } | ||
| 146 | |||
| 147 | ✗ | avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); | |
| 148 | |||
| 149 | ✗ | return 0; | |
| 150 | } | ||
| 151 | |||
| 152 | ✗ | static int codec2_read_header(AVFormatContext *s) | |
| 153 | { | ||
| 154 | ✗ | AVStream *st = avformat_new_stream(s, NULL); | |
| 155 | int ret, version; | ||
| 156 | |||
| 157 | ✗ | if (!st) { | |
| 158 | ✗ | return AVERROR(ENOMEM); | |
| 159 | } | ||
| 160 | |||
| 161 | ✗ | if (avio_rb24(s->pb) != CODEC2_MAGIC) { | |
| 162 | ✗ | av_log(s, AV_LOG_ERROR, "not a .c2 file\n"); | |
| 163 | ✗ | return AVERROR_INVALIDDATA; | |
| 164 | } | ||
| 165 | |||
| 166 | ✗ | ret = ff_alloc_extradata(st->codecpar, CODEC2_EXTRADATA_SIZE); | |
| 167 | ✗ | if (ret) { | |
| 168 | ✗ | return ret; | |
| 169 | } | ||
| 170 | |||
| 171 | ✗ | ret = ffio_read_size(s->pb, st->codecpar->extradata, CODEC2_EXTRADATA_SIZE); | |
| 172 | ✗ | if (ret < 0) { | |
| 173 | ✗ | return ret; | |
| 174 | } | ||
| 175 | |||
| 176 | ✗ | version = AV_RB16(st->codecpar->extradata); | |
| 177 | ✗ | if ((version >> 8) != EXPECTED_CODEC2_MAJOR_VERSION) { | |
| 178 | ✗ | avpriv_report_missing_feature(s, "Major version %i", version >> 8); | |
| 179 | ✗ | return AVERROR_PATCHWELCOME; | |
| 180 | } | ||
| 181 | |||
| 182 | ✗ | ffformatcontext(s)->data_offset = CODEC2_HEADER_SIZE; | |
| 183 | |||
| 184 | ✗ | return codec2_read_header_common(s, st); | |
| 185 | } | ||
| 186 | |||
| 187 | ✗ | static int codec2_read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 188 | { | ||
| 189 | ✗ | Codec2Context *c2 = s->priv_data; | |
| 190 | ✗ | AVStream *st = s->streams[0]; | |
| 191 | int ret, size, n, block_align, frame_size; | ||
| 192 | |||
| 193 | ✗ | block_align = st->codecpar->block_align; | |
| 194 | ✗ | frame_size = st->codecpar->frame_size; | |
| 195 | |||
| 196 | ✗ | if (block_align <= 0 || frame_size <= 0 || c2->frames_per_packet <= 0) { | |
| 197 | ✗ | return AVERROR(EINVAL); | |
| 198 | } | ||
| 199 | |||
| 200 | //try to read desired number of frames, compute n from to actual number of bytes read | ||
| 201 | ✗ | size = c2->frames_per_packet * block_align; | |
| 202 | ✗ | ret = av_get_packet(s->pb, pkt, size); | |
| 203 | ✗ | if (ret < 0) { | |
| 204 | ✗ | return ret; | |
| 205 | } | ||
| 206 | |||
| 207 | //only set duration - compute_pkt_fields() and ff_pcm_read_seek() takes care of everything else | ||
| 208 | //tested by spamming the seek functionality in ffplay | ||
| 209 | ✗ | n = ret / block_align; | |
| 210 | ✗ | pkt->duration = n * frame_size; | |
| 211 | |||
| 212 | ✗ | return ret; | |
| 213 | } | ||
| 214 | |||
| 215 | ✗ | static int codec2_write_header(AVFormatContext *s) | |
| 216 | { | ||
| 217 | ✗ | AVStream *st = s->streams[0]; | |
| 218 | |||
| 219 | ✗ | if (st->codecpar->extradata_size != CODEC2_EXTRADATA_SIZE) { | |
| 220 | ✗ | av_log(s, AV_LOG_ERROR, ".c2 files require exactly %i bytes of extradata (got %i)\n", | |
| 221 | ✗ | CODEC2_EXTRADATA_SIZE, st->codecpar->extradata_size); | |
| 222 | ✗ | return AVERROR(EINVAL); | |
| 223 | } | ||
| 224 | |||
| 225 | ✗ | avio_wb24(s->pb, CODEC2_MAGIC); | |
| 226 | ✗ | avio_write(s->pb, st->codecpar->extradata, CODEC2_EXTRADATA_SIZE); | |
| 227 | |||
| 228 | ✗ | return 0; | |
| 229 | } | ||
| 230 | |||
| 231 | ✗ | static int codec2raw_read_header(AVFormatContext *s) | |
| 232 | { | ||
| 233 | ✗ | Codec2Context *c2 = s->priv_data; | |
| 234 | AVStream *st; | ||
| 235 | int ret; | ||
| 236 | |||
| 237 | ✗ | if (c2->mode < 0) { | |
| 238 | //FIXME: using a default value of -1 for mandatory options is an incredibly ugly hack | ||
| 239 | ✗ | av_log(s, AV_LOG_ERROR, "-mode must be set in order to make sense of raw codec2 files\n"); | |
| 240 | ✗ | return AVERROR(EINVAL); | |
| 241 | } | ||
| 242 | |||
| 243 | ✗ | st = avformat_new_stream(s, NULL); | |
| 244 | ✗ | if (!st) { | |
| 245 | ✗ | return AVERROR(ENOMEM); | |
| 246 | } | ||
| 247 | |||
| 248 | ✗ | ret = ff_alloc_extradata(st->codecpar, CODEC2_EXTRADATA_SIZE); | |
| 249 | ✗ | if (ret) { | |
| 250 | ✗ | return ret; | |
| 251 | } | ||
| 252 | |||
| 253 | ✗ | codec2_make_extradata(st->codecpar->extradata, c2->mode); | |
| 254 | |||
| 255 | ✗ | return codec2_read_header_common(s, st); | |
| 256 | } | ||
| 257 | |||
| 258 | //transcoding report2074.c2 to wav went from 7.391s to 5.322s with -frames_per_packet 1000 compared to default, same sha1sum | ||
| 259 | #define FRAMES_PER_PACKET \ | ||
| 260 | { "frames_per_packet", "Number of frames to read at a time. Higher = faster decoding, lower granularity", \ | ||
| 261 | offsetof(Codec2Context, frames_per_packet), AV_OPT_TYPE_INT, {.i64 = 1}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM} | ||
| 262 | |||
| 263 | static const AVOption codec2_options[] = { | ||
| 264 | FRAMES_PER_PACKET, | ||
| 265 | { NULL }, | ||
| 266 | }; | ||
| 267 | |||
| 268 | static const AVOption codec2raw_options[] = { | ||
| 269 | CODEC2_AVOPTIONS("codec2 mode [mandatory]", Codec2Context, -1, -1, AV_OPT_FLAG_DECODING_PARAM), | ||
| 270 | FRAMES_PER_PACKET, | ||
| 271 | { NULL }, | ||
| 272 | }; | ||
| 273 | |||
| 274 | static const AVClass codec2_demux_class = { | ||
| 275 | .class_name = "codec2 demuxer", | ||
| 276 | .item_name = av_default_item_name, | ||
| 277 | .option = codec2_options, | ||
| 278 | .version = LIBAVUTIL_VERSION_INT, | ||
| 279 | .category = AV_CLASS_CATEGORY_DEMUXER, | ||
| 280 | }; | ||
| 281 | |||
| 282 | static const AVClass codec2raw_demux_class = { | ||
| 283 | .class_name = "codec2raw demuxer", | ||
| 284 | .item_name = av_default_item_name, | ||
| 285 | .option = codec2raw_options, | ||
| 286 | .version = LIBAVUTIL_VERSION_INT, | ||
| 287 | .category = AV_CLASS_CATEGORY_DEMUXER, | ||
| 288 | }; | ||
| 289 | |||
| 290 | #if CONFIG_CODEC2_DEMUXER | ||
| 291 | const FFInputFormat ff_codec2_demuxer = { | ||
| 292 | .p.name = "codec2", | ||
| 293 | .p.long_name = NULL_IF_CONFIG_SMALL("codec2 .c2 demuxer"), | ||
| 294 | .p.extensions = "c2", | ||
| 295 | .p.flags = AVFMT_GENERIC_INDEX, | ||
| 296 | .p.priv_class = &codec2_demux_class, | ||
| 297 | .priv_data_size = sizeof(Codec2Context), | ||
| 298 | .read_probe = codec2_probe, | ||
| 299 | .read_header = codec2_read_header, | ||
| 300 | .read_packet = codec2_read_packet, | ||
| 301 | .read_seek = ff_pcm_read_seek, | ||
| 302 | .raw_codec_id = AV_CODEC_ID_CODEC2, | ||
| 303 | }; | ||
| 304 | #endif | ||
| 305 | |||
| 306 | #if CONFIG_CODEC2_MUXER | ||
| 307 | const FFOutputFormat ff_codec2_muxer = { | ||
| 308 | .p.name = "codec2", | ||
| 309 | .p.long_name = NULL_IF_CONFIG_SMALL("codec2 .c2 muxer"), | ||
| 310 | .p.extensions = "c2", | ||
| 311 | .p.audio_codec = AV_CODEC_ID_CODEC2, | ||
| 312 | .p.video_codec = AV_CODEC_ID_NONE, | ||
| 313 | .p.subtitle_codec = AV_CODEC_ID_NONE, | ||
| 314 | .p.flags = AVFMT_NOTIMESTAMPS, | ||
| 315 | .flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH | | ||
| 316 | FF_OFMT_FLAG_ONLY_DEFAULT_CODECS, | ||
| 317 | .write_header = codec2_write_header, | ||
| 318 | .write_packet = ff_raw_write_packet, | ||
| 319 | }; | ||
| 320 | #endif | ||
| 321 | |||
| 322 | #if CONFIG_CODEC2RAW_DEMUXER | ||
| 323 | const FFInputFormat ff_codec2raw_demuxer = { | ||
| 324 | .p.name = "codec2raw", | ||
| 325 | .p.long_name = NULL_IF_CONFIG_SMALL("raw codec2 demuxer"), | ||
| 326 | .p.flags = AVFMT_GENERIC_INDEX, | ||
| 327 | .p.priv_class = &codec2raw_demux_class, | ||
| 328 | .priv_data_size = sizeof(Codec2Context), | ||
| 329 | .read_header = codec2raw_read_header, | ||
| 330 | .read_packet = codec2_read_packet, | ||
| 331 | .read_seek = ff_pcm_read_seek, | ||
| 332 | .raw_codec_id = AV_CODEC_ID_CODEC2, | ||
| 333 | }; | ||
| 334 | #endif | ||
| 335 |