| 1 | /* |
| 2 | * Copyright (c) 2010 Nicolas George |
| 3 | * Copyright (c) 2011 Stefano Sabatini |
| 4 | * Copyright (c) 2014 Andrey Utkin |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | * of this software and associated documentation files (the "Software"), to deal |
| 8 | * in the Software without restriction, including without limitation the rights |
| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 10 | * copies of the Software, and to permit persons to whom the Software is |
| 11 | * furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in |
| 14 | * all copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 22 | * THE SOFTWARE. |
| 23 | */ |
| 24 | |
| 25 | /** |
| 26 | * @file |
| 27 | * API example for demuxing, decoding, filtering, encoding and muxing |
| 28 | * @example transcoding.c |
| 29 | */ |
| 30 | |
| 31 | #include <libavcodec/avcodec.h> |
| 32 | #include <libavformat/avformat.h> |
| 33 | #include <libavfilter/avfiltergraph.h> |
| 34 | #include <libavfilter/avcodec.h> |
| 35 | #include <libavfilter/buffersink.h> |
| 36 | #include <libavfilter/buffersrc.h> |
| 37 | #include <libavutil/opt.h> |
| 38 | #include <libavutil/pixdesc.h> |
| 39 | |
| 40 | static AVFormatContext *ifmt_ctx; |
| 41 | static AVFormatContext *ofmt_ctx; |
| 42 | typedef struct FilteringContext { |
| 43 | AVFilterContext *buffersink_ctx; |
| 44 | AVFilterContext *buffersrc_ctx; |
| 45 | AVFilterGraph *filter_graph; |
| 46 | } FilteringContext; |
| 47 | static FilteringContext *filter_ctx; |
| 48 | |
| 49 | static int open_input_file(const char *filename) |
| 50 | { |
| 51 | int ret; |
| 52 | unsigned int i; |
| 53 | |
| 54 | ifmt_ctx = NULL; |
| 55 | if ((ret = avformat_open_input(&ifmt_ctx, filename, NULL, NULL)) < 0) { |
| 56 | av_log(NULL, AV_LOG_ERROR, "Cannot open input file\n"); |
| 57 | return ret; |
| 58 | } |
| 59 | |
| 60 | if ((ret = avformat_find_stream_info(ifmt_ctx, NULL)) < 0) { |
| 61 | av_log(NULL, AV_LOG_ERROR, "Cannot find stream information\n"); |
| 62 | return ret; |
| 63 | } |
| 64 | |
| 65 | for (i = 0; i < ifmt_ctx->nb_streams; i++) { |
| 66 | AVStream *stream; |
| 67 | AVCodecContext *codec_ctx; |
| 68 | stream = ifmt_ctx->streams[i]; |
| 69 | codec_ctx = stream->codec; |
| 70 | /* Reencode video & audio and remux subtitles etc. */ |
| 71 | if (codec_ctx->codec_type == AVMEDIA_TYPE_VIDEO |
| 72 | || codec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) { |
| 73 | /* Open decoder */ |
| 74 | ret = avcodec_open2(codec_ctx, |
| 75 | avcodec_find_decoder(codec_ctx->codec_id), NULL); |
| 76 | if (ret < 0) { |
| 77 | av_log(NULL, AV_LOG_ERROR, "Failed to open decoder for stream #%u\n", i); |
| 78 | return ret; |
| 79 | } |
| 80 | } |
| 81 | } |
| 82 | |
| 83 | av_dump_format(ifmt_ctx, 0, filename, 0); |
| 84 | return 0; |
| 85 | } |
| 86 | |
| 87 | static int open_output_file(const char *filename) |
| 88 | { |
| 89 | AVStream *out_stream; |
| 90 | AVStream *in_stream; |
| 91 | AVCodecContext *dec_ctx, *enc_ctx; |
| 92 | AVCodec *encoder; |
| 93 | int ret; |
| 94 | unsigned int i; |
| 95 | |
| 96 | ofmt_ctx = NULL; |
| 97 | avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, filename); |
| 98 | if (!ofmt_ctx) { |
| 99 | av_log(NULL, AV_LOG_ERROR, "Could not create output context\n"); |
| 100 | return AVERROR_UNKNOWN; |
| 101 | } |
| 102 | |
| 103 | |
| 104 | for (i = 0; i < ifmt_ctx->nb_streams; i++) { |
| 105 | out_stream = avformat_new_stream(ofmt_ctx, NULL); |
| 106 | if (!out_stream) { |
| 107 | av_log(NULL, AV_LOG_ERROR, "Failed allocating output stream\n"); |
| 108 | return AVERROR_UNKNOWN; |
| 109 | } |
| 110 | |
| 111 | in_stream = ifmt_ctx->streams[i]; |
| 112 | dec_ctx = in_stream->codec; |
| 113 | enc_ctx = out_stream->codec; |
| 114 | |
| 115 | if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO |
| 116 | || dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) { |
| 117 | /* in this example, we choose transcoding to same codec */ |
| 118 | encoder = avcodec_find_encoder(dec_ctx->codec_id); |
| 119 | if (!encoder) { |
| 120 | av_log(NULL, AV_LOG_FATAL, "Neccessary encoder not found\n"); |
| 121 | return AVERROR_INVALIDDATA; |
| 122 | } |
| 123 | |
| 124 | /* In this example, we transcode to same properties (picture size, |
| 125 | * sample rate etc.). These properties can be changed for output |
| 126 | * streams easily using filters */ |
| 127 | if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO) { |
| 128 | enc_ctx->height = dec_ctx->height; |
| 129 | enc_ctx->width = dec_ctx->width; |
| 130 | enc_ctx->sample_aspect_ratio = dec_ctx->sample_aspect_ratio; |
| 131 | /* take first format from list of supported formats */ |
| 132 | enc_ctx->pix_fmt = encoder->pix_fmts[0]; |
| 133 | /* video time_base can be set to whatever is handy and supported by encoder */ |
| 134 | enc_ctx->time_base = dec_ctx->time_base; |
| 135 | } else { |
| 136 | enc_ctx->sample_rate = dec_ctx->sample_rate; |
| 137 | enc_ctx->channel_layout = dec_ctx->channel_layout; |
| 138 | enc_ctx->channels = av_get_channel_layout_nb_channels(enc_ctx->channel_layout); |
| 139 | /* take first format from list of supported formats */ |
| 140 | enc_ctx->sample_fmt = encoder->sample_fmts[0]; |
| 141 | enc_ctx->time_base = (AVRational){1, enc_ctx->sample_rate}; |
| 142 | } |
| 143 | |
| 144 | /* Third parameter can be used to pass settings to encoder */ |
| 145 | ret = avcodec_open2(enc_ctx, encoder, NULL); |
| 146 | if (ret < 0) { |
| 147 | av_log(NULL, AV_LOG_ERROR, "Cannot open video encoder for stream #%u\n", i); |
| 148 | return ret; |
| 149 | } |
| 150 | } else if (dec_ctx->codec_type == AVMEDIA_TYPE_UNKNOWN) { |
| 151 | av_log(NULL, AV_LOG_FATAL, "Elementary stream #%d is of unknown type, cannot proceed\n", i); |
| 152 | return AVERROR_INVALIDDATA; |
| 153 | } else { |
| 154 | /* if this stream must be remuxed */ |
| 155 | ret = avcodec_copy_context(ofmt_ctx->streams[i]->codec, |
| 156 | ifmt_ctx->streams[i]->codec); |
| 157 | if (ret < 0) { |
| 158 | av_log(NULL, AV_LOG_ERROR, "Copying stream context failed\n"); |
| 159 | return ret; |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER) |
| 164 | enc_ctx->flags |= CODEC_FLAG_GLOBAL_HEADER; |
| 165 | |
| 166 | } |
| 167 | av_dump_format(ofmt_ctx, 0, filename, 1); |
| 168 | |
| 169 | if (!(ofmt_ctx->oformat->flags & AVFMT_NOFILE)) { |
| 170 | ret = avio_open(&ofmt_ctx->pb, filename, AVIO_FLAG_WRITE); |
| 171 | if (ret < 0) { |
| 172 | av_log(NULL, AV_LOG_ERROR, "Could not open output file '%s'", filename); |
| 173 | return ret; |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | /* init muxer, write output file header */ |
| 178 | ret = avformat_write_header(ofmt_ctx, NULL); |
| 179 | if (ret < 0) { |
| 180 | av_log(NULL, AV_LOG_ERROR, "Error occurred when opening output file\n"); |
| 181 | return ret; |
| 182 | } |
| 183 | |
| 184 | return 0; |
| 185 | } |
| 186 | |
| 187 | static int init_filter(FilteringContext* fctx, AVCodecContext *dec_ctx, |
| 188 | AVCodecContext *enc_ctx, const char *filter_spec) |
| 189 | { |
| 190 | char args[512]; |
| 191 | int ret = 0; |
| 192 | AVFilter *buffersrc = NULL; |
| 193 | AVFilter *buffersink = NULL; |
| 194 | AVFilterContext *buffersrc_ctx = NULL; |
| 195 | AVFilterContext *buffersink_ctx = NULL; |
| 196 | AVFilterInOut *outputs = avfilter_inout_alloc(); |
| 197 | AVFilterInOut *inputs = avfilter_inout_alloc(); |
| 198 | AVFilterGraph *filter_graph = avfilter_graph_alloc(); |
| 199 | |
| 200 | if (!outputs || !inputs || !filter_graph) { |
| 201 | ret = AVERROR(ENOMEM); |
| 202 | goto end; |
| 203 | } |
| 204 | |
| 205 | if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO) { |
| 206 | buffersrc = avfilter_get_by_name("buffer"); |
| 207 | buffersink = avfilter_get_by_name("buffersink"); |
| 208 | if (!buffersrc || !buffersink) { |
| 209 | av_log(NULL, AV_LOG_ERROR, "filtering source or sink element not found\n"); |
| 210 | ret = AVERROR_UNKNOWN; |
| 211 | goto end; |
| 212 | } |
| 213 | |
| 214 | snprintf(args, sizeof(args), |
| 215 | "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d", |
| 216 | dec_ctx->width, dec_ctx->height, dec_ctx->pix_fmt, |
| 217 | dec_ctx->time_base.num, dec_ctx->time_base.den, |
| 218 | dec_ctx->sample_aspect_ratio.num, |
| 219 | dec_ctx->sample_aspect_ratio.den); |
| 220 | |
| 221 | ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in", |
| 222 | args, NULL, filter_graph); |
| 223 | if (ret < 0) { |
| 224 | av_log(NULL, AV_LOG_ERROR, "Cannot create buffer source\n"); |
| 225 | goto end; |
| 226 | } |
| 227 | |
| 228 | ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out", |
| 229 | NULL, NULL, filter_graph); |
| 230 | if (ret < 0) { |
| 231 | av_log(NULL, AV_LOG_ERROR, "Cannot create buffer sink\n"); |
| 232 | goto end; |
| 233 | } |
| 234 | |
| 235 | ret = av_opt_set_bin(buffersink_ctx, "pix_fmts", |
| 236 | (uint8_t*)&enc_ctx->pix_fmt, sizeof(enc_ctx->pix_fmt), |
| 237 | AV_OPT_SEARCH_CHILDREN); |
| 238 | if (ret < 0) { |
| 239 | av_log(NULL, AV_LOG_ERROR, "Cannot set output pixel format\n"); |
| 240 | goto end; |
| 241 | } |
| 242 | } else if (dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) { |
| 243 | buffersrc = avfilter_get_by_name("abuffer"); |
| 244 | buffersink = avfilter_get_by_name("abuffersink"); |
| 245 | if (!buffersrc || !buffersink) { |
| 246 | av_log(NULL, AV_LOG_ERROR, "filtering source or sink element not found\n"); |
| 247 | ret = AVERROR_UNKNOWN; |
| 248 | goto end; |
| 249 | } |
| 250 | |
| 251 | if (!dec_ctx->channel_layout) |
| 252 | dec_ctx->channel_layout = |
| 253 | av_get_default_channel_layout(dec_ctx->channels); |
| 254 | snprintf(args, sizeof(args), |
| 255 | "time_base=%d/%d:sample_rate=%d:sample_fmt=%s:channel_layout=0x%"PRIx64, |
| 256 | dec_ctx->time_base.num, dec_ctx->time_base.den, dec_ctx->sample_rate, |
| 257 | av_get_sample_fmt_name(dec_ctx->sample_fmt), |
| 258 | dec_ctx->channel_layout); |
| 259 | ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in", |
| 260 | args, NULL, filter_graph); |
| 261 | if (ret < 0) { |
| 262 | av_log(NULL, AV_LOG_ERROR, "Cannot create audio buffer source\n"); |
| 263 | goto end; |
| 264 | } |
| 265 | |
| 266 | ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out", |
| 267 | NULL, NULL, filter_graph); |
| 268 | if (ret < 0) { |
| 269 | av_log(NULL, AV_LOG_ERROR, "Cannot create audio buffer sink\n"); |
| 270 | goto end; |
| 271 | } |
| 272 | |
| 273 | ret = av_opt_set_bin(buffersink_ctx, "sample_fmts", |
| 274 | (uint8_t*)&enc_ctx->sample_fmt, sizeof(enc_ctx->sample_fmt), |
| 275 | AV_OPT_SEARCH_CHILDREN); |
| 276 | if (ret < 0) { |
| 277 | av_log(NULL, AV_LOG_ERROR, "Cannot set output sample format\n"); |
| 278 | goto end; |
| 279 | } |
| 280 | |
| 281 | ret = av_opt_set_bin(buffersink_ctx, "channel_layouts", |
| 282 | (uint8_t*)&enc_ctx->channel_layout, |
| 283 | sizeof(enc_ctx->channel_layout), AV_OPT_SEARCH_CHILDREN); |
| 284 | if (ret < 0) { |
| 285 | av_log(NULL, AV_LOG_ERROR, "Cannot set output channel layout\n"); |
| 286 | goto end; |
| 287 | } |
| 288 | |
| 289 | ret = av_opt_set_bin(buffersink_ctx, "sample_rates", |
| 290 | (uint8_t*)&enc_ctx->sample_rate, sizeof(enc_ctx->sample_rate), |
| 291 | AV_OPT_SEARCH_CHILDREN); |
| 292 | if (ret < 0) { |
| 293 | av_log(NULL, AV_LOG_ERROR, "Cannot set output sample rate\n"); |
| 294 | goto end; |
| 295 | } |
| 296 | } else { |
| 297 | ret = AVERROR_UNKNOWN; |
| 298 | goto end; |
| 299 | } |
| 300 | |
| 301 | /* Endpoints for the filter graph. */ |
| 302 | outputs->name = av_strdup("in"); |
| 303 | outputs->filter_ctx = buffersrc_ctx; |
| 304 | outputs->pad_idx = 0; |
| 305 | outputs->next = NULL; |
| 306 | |
| 307 | inputs->name = av_strdup("out"); |
| 308 | inputs->filter_ctx = buffersink_ctx; |
| 309 | inputs->pad_idx = 0; |
| 310 | inputs->next = NULL; |
| 311 | |
| 312 | if (!outputs->name || !inputs->name) { |
| 313 | ret = AVERROR(ENOMEM); |
| 314 | goto end; |
| 315 | } |
| 316 | |
| 317 | if ((ret = avfilter_graph_parse_ptr(filter_graph, filter_spec, |
| 318 | &inputs, &outputs, NULL)) < 0) |
| 319 | goto end; |
| 320 | |
| 321 | if ((ret = avfilter_graph_config(filter_graph, NULL)) < 0) |
| 322 | goto end; |
| 323 | |
| 324 | /* Fill FilteringContext */ |
| 325 | fctx->buffersrc_ctx = buffersrc_ctx; |
| 326 | fctx->buffersink_ctx = buffersink_ctx; |
| 327 | fctx->filter_graph = filter_graph; |
| 328 | |
| 329 | end: |
| 330 | avfilter_inout_free(&inputs); |
| 331 | avfilter_inout_free(&outputs); |
| 332 | |
| 333 | return ret; |
| 334 | } |
| 335 | |
| 336 | static int init_filters(void) |
| 337 | { |
| 338 | const char *filter_spec; |
| 339 | unsigned int i; |
| 340 | int ret; |
| 341 | filter_ctx = av_malloc_array(ifmt_ctx->nb_streams, sizeof(*filter_ctx)); |
| 342 | if (!filter_ctx) |
| 343 | return AVERROR(ENOMEM); |
| 344 | |
| 345 | for (i = 0; i < ifmt_ctx->nb_streams; i++) { |
| 346 | filter_ctx[i].buffersrc_ctx = NULL; |
| 347 | filter_ctx[i].buffersink_ctx = NULL; |
| 348 | filter_ctx[i].filter_graph = NULL; |
| 349 | if (!(ifmt_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO |
| 350 | || ifmt_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)) |
| 351 | continue; |
| 352 | |
| 353 | |
| 354 | if (ifmt_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) |
| 355 | filter_spec = "null"; /* passthrough (dummy) filter for video */ |
| 356 | else |
| 357 | filter_spec = "anull"; /* passthrough (dummy) filter for audio */ |
| 358 | ret = init_filter(&filter_ctx[i], ifmt_ctx->streams[i]->codec, |
| 359 | ofmt_ctx->streams[i]->codec, filter_spec); |
| 360 | if (ret) |
| 361 | return ret; |
| 362 | } |
| 363 | return 0; |
| 364 | } |
| 365 | |
| 366 | static int encode_write_frame(AVFrame *filt_frame, unsigned int stream_index, int *got_frame) { |
| 367 | int ret; |
| 368 | int got_frame_local; |
| 369 | AVPacket enc_pkt; |
| 370 | int (*enc_func)(AVCodecContext *, AVPacket *, const AVFrame *, int *) = |
| 371 | (ifmt_ctx->streams[stream_index]->codec->codec_type == |
| 372 | AVMEDIA_TYPE_VIDEO) ? avcodec_encode_video2 : avcodec_encode_audio2; |
| 373 | |
| 374 | if (!got_frame) |
| 375 | got_frame = &got_frame_local; |
| 376 | |
| 377 | av_log(NULL, AV_LOG_INFO, "Encoding frame\n"); |
| 378 | /* encode filtered frame */ |
| 379 | enc_pkt.data = NULL; |
| 380 | enc_pkt.size = 0; |
| 381 | av_init_packet(&enc_pkt); |
| 382 | ret = enc_func(ofmt_ctx->streams[stream_index]->codec, &enc_pkt, |
| 383 | filt_frame, got_frame); |
| 384 | av_frame_free(&filt_frame); |
| 385 | if (ret < 0) |
| 386 | return ret; |
| 387 | if (!(*got_frame)) |
| 388 | return 0; |
| 389 | |
| 390 | /* prepare packet for muxing */ |
| 391 | enc_pkt.stream_index = stream_index; |
| 392 | av_packet_rescale_ts(&enc_pkt, |
| 393 | ofmt_ctx->streams[stream_index]->codec->time_base, |
| 394 | ofmt_ctx->streams[stream_index]->time_base); |
| 395 | |
| 396 | av_log(NULL, AV_LOG_DEBUG, "Muxing frame\n"); |
| 397 | /* mux encoded frame */ |
| 398 | ret = av_interleaved_write_frame(ofmt_ctx, &enc_pkt); |
| 399 | return ret; |
| 400 | } |
| 401 | |
| 402 | static int filter_encode_write_frame(AVFrame *frame, unsigned int stream_index) |
| 403 | { |
| 404 | int ret; |
| 405 | AVFrame *filt_frame; |
| 406 | |
| 407 | av_log(NULL, AV_LOG_INFO, "Pushing decoded frame to filters\n"); |
| 408 | /* push the decoded frame into the filtergraph */ |
| 409 | ret = av_buffersrc_add_frame_flags(filter_ctx[stream_index].buffersrc_ctx, |
| 410 | frame, 0); |
| 411 | if (ret < 0) { |
| 412 | av_log(NULL, AV_LOG_ERROR, "Error while feeding the filtergraph\n"); |
| 413 | return ret; |
| 414 | } |
| 415 | |
| 416 | /* pull filtered frames from the filtergraph */ |
| 417 | while (1) { |
| 418 | filt_frame = av_frame_alloc(); |
| 419 | if (!filt_frame) { |
| 420 | ret = AVERROR(ENOMEM); |
| 421 | break; |
| 422 | } |
| 423 | av_log(NULL, AV_LOG_INFO, "Pulling filtered frame from filters\n"); |
| 424 | ret = av_buffersink_get_frame(filter_ctx[stream_index].buffersink_ctx, |
| 425 | filt_frame); |
| 426 | if (ret < 0) { |
| 427 | /* if no more frames for output - returns AVERROR(EAGAIN) |
| 428 | * if flushed and no more frames for output - returns AVERROR_EOF |
| 429 | * rewrite retcode to 0 to show it as normal procedure completion |
| 430 | */ |
| 431 | if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) |
| 432 | ret = 0; |
| 433 | av_frame_free(&filt_frame); |
| 434 | break; |
| 435 | } |
| 436 | |
| 437 | filt_frame->pict_type = AV_PICTURE_TYPE_NONE; |
| 438 | ret = encode_write_frame(filt_frame, stream_index, NULL); |
| 439 | if (ret < 0) |
| 440 | break; |
| 441 | } |
| 442 | |
| 443 | return ret; |
| 444 | } |
| 445 | |
| 446 | static int flush_encoder(unsigned int stream_index) |
| 447 | { |
| 448 | int ret; |
| 449 | int got_frame; |
| 450 | |
| 451 | if (!(ofmt_ctx->streams[stream_index]->codec->codec->capabilities & |
| 452 | CODEC_CAP_DELAY)) |
| 453 | return 0; |
| 454 | |
| 455 | while (1) { |
| 456 | av_log(NULL, AV_LOG_INFO, "Flushing stream #%u encoder\n", stream_index); |
| 457 | ret = encode_write_frame(NULL, stream_index, &got_frame); |
| 458 | if (ret < 0) |
| 459 | break; |
| 460 | if (!got_frame) |
| 461 | return 0; |
| 462 | } |
| 463 | return ret; |
| 464 | } |
| 465 | |
| 466 | int main(int argc, char **argv) |
| 467 | { |
| 468 | int ret; |
| 469 | AVPacket packet = { .data = NULL, .size = 0 }; |
| 470 | AVFrame *frame = NULL; |
| 471 | enum AVMediaType type; |
| 472 | unsigned int stream_index; |
| 473 | unsigned int i; |
| 474 | int got_frame; |
| 475 | int (*dec_func)(AVCodecContext *, AVFrame *, int *, const AVPacket *); |
| 476 | |
| 477 | if (argc != 3) { |
| 478 | av_log(NULL, AV_LOG_ERROR, "Usage: %s <input file> <output file>\n", argv[0]); |
| 479 | return 1; |
| 480 | } |
| 481 | |
| 482 | av_register_all(); |
| 483 | avfilter_register_all(); |
| 484 | |
| 485 | if ((ret = open_input_file(argv[1])) < 0) |
| 486 | goto end; |
| 487 | if ((ret = open_output_file(argv[2])) < 0) |
| 488 | goto end; |
| 489 | if ((ret = init_filters()) < 0) |
| 490 | goto end; |
| 491 | |
| 492 | /* read all packets */ |
| 493 | while (1) { |
| 494 | if ((ret = av_read_frame(ifmt_ctx, &packet)) < 0) |
| 495 | break; |
| 496 | stream_index = packet.stream_index; |
| 497 | type = ifmt_ctx->streams[packet.stream_index]->codec->codec_type; |
| 498 | av_log(NULL, AV_LOG_DEBUG, "Demuxer gave frame of stream_index %u\n", |
| 499 | stream_index); |
| 500 | |
| 501 | if (filter_ctx[stream_index].filter_graph) { |
| 502 | av_log(NULL, AV_LOG_DEBUG, "Going to reencode&filter the frame\n"); |
| 503 | frame = av_frame_alloc(); |
| 504 | if (!frame) { |
| 505 | ret = AVERROR(ENOMEM); |
| 506 | break; |
| 507 | } |
| 508 | av_packet_rescale_ts(&packet, |
| 509 | ifmt_ctx->streams[stream_index]->time_base, |
| 510 | ifmt_ctx->streams[stream_index]->codec->time_base); |
| 511 | dec_func = (type == AVMEDIA_TYPE_VIDEO) ? avcodec_decode_video2 : |
| 512 | avcodec_decode_audio4; |
| 513 | ret = dec_func(ifmt_ctx->streams[stream_index]->codec, frame, |
| 514 | &got_frame, &packet); |
| 515 | if (ret < 0) { |
| 516 | av_frame_free(&frame); |
| 517 | av_log(NULL, AV_LOG_ERROR, "Decoding failed\n"); |
| 518 | break; |
| 519 | } |
| 520 | |
| 521 | if (got_frame) { |
| 522 | frame->pts = av_frame_get_best_effort_timestamp(frame); |
| 523 | ret = filter_encode_write_frame(frame, stream_index); |
| 524 | av_frame_free(&frame); |
| 525 | if (ret < 0) |
| 526 | goto end; |
| 527 | } else { |
| 528 | av_frame_free(&frame); |
| 529 | } |
| 530 | } else { |
| 531 | /* remux this frame without reencoding */ |
| 532 | av_packet_rescale_ts(&packet, |
| 533 | ifmt_ctx->streams[stream_index]->time_base, |
| 534 | ofmt_ctx->streams[stream_index]->time_base); |
| 535 | |
| 536 | ret = av_interleaved_write_frame(ofmt_ctx, &packet); |
| 537 | if (ret < 0) |
| 538 | goto end; |
| 539 | } |
| 540 | av_free_packet(&packet); |
| 541 | } |
| 542 | |
| 543 | /* flush filters and encoders */ |
| 544 | for (i = 0; i < ifmt_ctx->nb_streams; i++) { |
| 545 | /* flush filter */ |
| 546 | if (!filter_ctx[i].filter_graph) |
| 547 | continue; |
| 548 | ret = filter_encode_write_frame(NULL, i); |
| 549 | if (ret < 0) { |
| 550 | av_log(NULL, AV_LOG_ERROR, "Flushing filter failed\n"); |
| 551 | goto end; |
| 552 | } |
| 553 | |
| 554 | /* flush encoder */ |
| 555 | ret = flush_encoder(i); |
| 556 | if (ret < 0) { |
| 557 | av_log(NULL, AV_LOG_ERROR, "Flushing encoder failed\n"); |
| 558 | goto end; |
| 559 | } |
| 560 | } |
| 561 | |
| 562 | av_write_trailer(ofmt_ctx); |
| 563 | end: |
| 564 | av_free_packet(&packet); |
| 565 | av_frame_free(&frame); |
| 566 | for (i = 0; i < ifmt_ctx->nb_streams; i++) { |
| 567 | avcodec_close(ifmt_ctx->streams[i]->codec); |
| 568 | if (ofmt_ctx && ofmt_ctx->nb_streams > i && ofmt_ctx->streams[i] && ofmt_ctx->streams[i]->codec) |
| 569 | avcodec_close(ofmt_ctx->streams[i]->codec); |
| 570 | if (filter_ctx && filter_ctx[i].filter_graph) |
| 571 | avfilter_graph_free(&filter_ctx[i].filter_graph); |
| 572 | } |
| 573 | av_free(filter_ctx); |
| 574 | avformat_close_input(&ifmt_ctx); |
| 575 | if (ofmt_ctx && !(ofmt_ctx->oformat->flags & AVFMT_NOFILE)) |
| 576 | avio_close(ofmt_ctx->pb); |
| 577 | avformat_free_context(ofmt_ctx); |
| 578 | |
| 579 | if (ret < 0) |
| 580 | av_log(NULL, AV_LOG_ERROR, "Error occurred: %s\n", av_err2str(ret)); |
| 581 | |
| 582 | return ret ? 1 : 0; |
| 583 | } |