| /* |
| * Copyright (c) 2010 Nicolas George |
| * Copyright (c) 2011 Stefano Sabatini |
| * Copyright (c) 2014 Andrey Utkin |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to deal |
| * in the Software without restriction, including without limitation the rights |
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| * copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| * THE SOFTWARE. |
| */ |
| |
| /** |
| * @file |
| * API example for demuxing, decoding, filtering, encoding and muxing |
| * @example transcoding.c |
| */ |
| |
| #include <libavcodec/avcodec.h> |
| #include <libavformat/avformat.h> |
| #include <libavfilter/avfiltergraph.h> |
| #include <libavfilter/buffersink.h> |
| #include <libavfilter/buffersrc.h> |
| #include <libavutil/opt.h> |
| #include <libavutil/pixdesc.h> |
| |
| static AVFormatContext *ifmt_ctx; |
| static AVFormatContext *ofmt_ctx; |
| typedef struct FilteringContext { |
| AVFilterContext *buffersink_ctx; |
| AVFilterContext *buffersrc_ctx; |
| AVFilterGraph *filter_graph; |
| } FilteringContext; |
| static FilteringContext *filter_ctx; |
| |
| static int open_input_file(const char *filename) |
| { |
| int ret; |
| unsigned int i; |
| |
| ifmt_ctx = NULL; |
| if ((ret = avformat_open_input(&ifmt_ctx, filename, NULL, NULL)) < 0) { |
| av_log(NULL, AV_LOG_ERROR, "Cannot open input file\n"); |
| return ret; |
| } |
| |
| if ((ret = avformat_find_stream_info(ifmt_ctx, NULL)) < 0) { |
| av_log(NULL, AV_LOG_ERROR, "Cannot find stream information\n"); |
| return ret; |
| } |
| |
| for (i = 0; i < ifmt_ctx->nb_streams; i++) { |
| AVStream *stream; |
| AVCodecContext *codec_ctx; |
| stream = ifmt_ctx->streams[i]; |
| codec_ctx = stream->codec; |
| /* Reencode video & audio and remux subtitles etc. */ |
| if (codec_ctx->codec_type == AVMEDIA_TYPE_VIDEO |
| || codec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) { |
| /* Open decoder */ |
| ret = avcodec_open2(codec_ctx, |
| avcodec_find_decoder(codec_ctx->codec_id), NULL); |
| if (ret < 0) { |
| av_log(NULL, AV_LOG_ERROR, "Failed to open decoder for stream #%u\n", i); |
| return ret; |
| } |
| } |
| } |
| |
| av_dump_format(ifmt_ctx, 0, filename, 0); |
| return 0; |
| } |
| |
| static int open_output_file(const char *filename) |
| { |
| AVStream *out_stream; |
| AVStream *in_stream; |
| AVCodecContext *dec_ctx, *enc_ctx; |
| AVCodec *encoder; |
| int ret; |
| unsigned int i; |
| |
| ofmt_ctx = NULL; |
| avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, filename); |
| if (!ofmt_ctx) { |
| av_log(NULL, AV_LOG_ERROR, "Could not create output context\n"); |
| return AVERROR_UNKNOWN; |
| } |
| |
| |
| for (i = 0; i < ifmt_ctx->nb_streams; i++) { |
| out_stream = avformat_new_stream(ofmt_ctx, NULL); |
| if (!out_stream) { |
| av_log(NULL, AV_LOG_ERROR, "Failed allocating output stream\n"); |
| return AVERROR_UNKNOWN; |
| } |
| |
| in_stream = ifmt_ctx->streams[i]; |
| dec_ctx = in_stream->codec; |
| enc_ctx = out_stream->codec; |
| |
| if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO |
| || dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) { |
| /* in this example, we choose transcoding to same codec */ |
| encoder = avcodec_find_encoder(dec_ctx->codec_id); |
| if (!encoder) { |
| av_log(NULL, AV_LOG_FATAL, "Necessary encoder not found\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| /* In this example, we transcode to same properties (picture size, |
| * sample rate etc.). These properties can be changed for output |
| * streams easily using filters */ |
| if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO) { |
| enc_ctx->height = dec_ctx->height; |
| enc_ctx->width = dec_ctx->width; |
| enc_ctx->sample_aspect_ratio = dec_ctx->sample_aspect_ratio; |
| /* take first format from list of supported formats */ |
| enc_ctx->pix_fmt = encoder->pix_fmts[0]; |
| /* video time_base can be set to whatever is handy and supported by encoder */ |
| enc_ctx->time_base = dec_ctx->time_base; |
| } else { |
| enc_ctx->sample_rate = dec_ctx->sample_rate; |
| enc_ctx->channel_layout = dec_ctx->channel_layout; |
| enc_ctx->channels = av_get_channel_layout_nb_channels(enc_ctx->channel_layout); |
| /* take first format from list of supported formats */ |
| enc_ctx->sample_fmt = encoder->sample_fmts[0]; |
| enc_ctx->time_base = (AVRational){1, enc_ctx->sample_rate}; |
| } |
| |
| /* Third parameter can be used to pass settings to encoder */ |
| ret = avcodec_open2(enc_ctx, encoder, NULL); |
| if (ret < 0) { |
| av_log(NULL, AV_LOG_ERROR, "Cannot open video encoder for stream #%u\n", i); |
| return ret; |
| } |
| } else if (dec_ctx->codec_type == AVMEDIA_TYPE_UNKNOWN) { |
| av_log(NULL, AV_LOG_FATAL, "Elementary stream #%d is of unknown type, cannot proceed\n", i); |
| return AVERROR_INVALIDDATA; |
| } else { |
| /* if this stream must be remuxed */ |
| ret = avcodec_copy_context(ofmt_ctx->streams[i]->codec, |
| ifmt_ctx->streams[i]->codec); |
| if (ret < 0) { |
| av_log(NULL, AV_LOG_ERROR, "Copying stream context failed\n"); |
| return ret; |
| } |
| } |
| |
| if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER) |
| enc_ctx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER; |
| |
| } |
| av_dump_format(ofmt_ctx, 0, filename, 1); |
| |
| if (!(ofmt_ctx->oformat->flags & AVFMT_NOFILE)) { |
| ret = avio_open(&ofmt_ctx->pb, filename, AVIO_FLAG_WRITE); |
| if (ret < 0) { |
| av_log(NULL, AV_LOG_ERROR, "Could not open output file '%s'", filename); |
| return ret; |
| } |
| } |
| |
| /* init muxer, write output file header */ |
| ret = avformat_write_header(ofmt_ctx, NULL); |
| if (ret < 0) { |
| av_log(NULL, AV_LOG_ERROR, "Error occurred when opening output file\n"); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int init_filter(FilteringContext* fctx, AVCodecContext *dec_ctx, |
| AVCodecContext *enc_ctx, const char *filter_spec) |
| { |
| char args[512]; |
| int ret = 0; |
| AVFilter *buffersrc = NULL; |
| AVFilter *buffersink = NULL; |
| AVFilterContext *buffersrc_ctx = NULL; |
| AVFilterContext *buffersink_ctx = NULL; |
| AVFilterInOut *outputs = avfilter_inout_alloc(); |
| AVFilterInOut *inputs = avfilter_inout_alloc(); |
| AVFilterGraph *filter_graph = avfilter_graph_alloc(); |
| |
| if (!outputs || !inputs || !filter_graph) { |
| ret = AVERROR(ENOMEM); |
| goto end; |
| } |
| |
| if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO) { |
| buffersrc = avfilter_get_by_name("buffer"); |
| buffersink = avfilter_get_by_name("buffersink"); |
| if (!buffersrc || !buffersink) { |
| av_log(NULL, AV_LOG_ERROR, "filtering source or sink element not found\n"); |
| ret = AVERROR_UNKNOWN; |
| goto end; |
| } |
| |
| snprintf(args, sizeof(args), |
| "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d", |
| dec_ctx->width, dec_ctx->height, dec_ctx->pix_fmt, |
| dec_ctx->time_base.num, dec_ctx->time_base.den, |
| dec_ctx->sample_aspect_ratio.num, |
| dec_ctx->sample_aspect_ratio.den); |
| |
| ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in", |
| args, NULL, filter_graph); |
| if (ret < 0) { |
| av_log(NULL, AV_LOG_ERROR, "Cannot create buffer source\n"); |
| goto end; |
| } |
| |
| ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out", |
| NULL, NULL, filter_graph); |
| if (ret < 0) { |
| av_log(NULL, AV_LOG_ERROR, "Cannot create buffer sink\n"); |
| goto end; |
| } |
| |
| ret = av_opt_set_bin(buffersink_ctx, "pix_fmts", |
| (uint8_t*)&enc_ctx->pix_fmt, sizeof(enc_ctx->pix_fmt), |
| AV_OPT_SEARCH_CHILDREN); |
| if (ret < 0) { |
| av_log(NULL, AV_LOG_ERROR, "Cannot set output pixel format\n"); |
| goto end; |
| } |
| } else if (dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) { |
| buffersrc = avfilter_get_by_name("abuffer"); |
| buffersink = avfilter_get_by_name("abuffersink"); |
| if (!buffersrc || !buffersink) { |
| av_log(NULL, AV_LOG_ERROR, "filtering source or sink element not found\n"); |
| ret = AVERROR_UNKNOWN; |
| goto end; |
| } |
| |
| if (!dec_ctx->channel_layout) |
| dec_ctx->channel_layout = |
| av_get_default_channel_layout(dec_ctx->channels); |
| snprintf(args, sizeof(args), |
| "time_base=%d/%d:sample_rate=%d:sample_fmt=%s:channel_layout=0x%"PRIx64, |
| dec_ctx->time_base.num, dec_ctx->time_base.den, dec_ctx->sample_rate, |
| av_get_sample_fmt_name(dec_ctx->sample_fmt), |
| dec_ctx->channel_layout); |
| ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in", |
| args, NULL, filter_graph); |
| if (ret < 0) { |
| av_log(NULL, AV_LOG_ERROR, "Cannot create audio buffer source\n"); |
| goto end; |
| } |
| |
| ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out", |
| NULL, NULL, filter_graph); |
| if (ret < 0) { |
| av_log(NULL, AV_LOG_ERROR, "Cannot create audio buffer sink\n"); |
| goto end; |
| } |
| |
| ret = av_opt_set_bin(buffersink_ctx, "sample_fmts", |
| (uint8_t*)&enc_ctx->sample_fmt, sizeof(enc_ctx->sample_fmt), |
| AV_OPT_SEARCH_CHILDREN); |
| if (ret < 0) { |
| av_log(NULL, AV_LOG_ERROR, "Cannot set output sample format\n"); |
| goto end; |
| } |
| |
| ret = av_opt_set_bin(buffersink_ctx, "channel_layouts", |
| (uint8_t*)&enc_ctx->channel_layout, |
| sizeof(enc_ctx->channel_layout), AV_OPT_SEARCH_CHILDREN); |
| if (ret < 0) { |
| av_log(NULL, AV_LOG_ERROR, "Cannot set output channel layout\n"); |
| goto end; |
| } |
| |
| ret = av_opt_set_bin(buffersink_ctx, "sample_rates", |
| (uint8_t*)&enc_ctx->sample_rate, sizeof(enc_ctx->sample_rate), |
| AV_OPT_SEARCH_CHILDREN); |
| if (ret < 0) { |
| av_log(NULL, AV_LOG_ERROR, "Cannot set output sample rate\n"); |
| goto end; |
| } |
| } else { |
| ret = AVERROR_UNKNOWN; |
| goto end; |
| } |
| |
| /* Endpoints for the filter graph. */ |
| outputs->name = av_strdup("in"); |
| outputs->filter_ctx = buffersrc_ctx; |
| outputs->pad_idx = 0; |
| outputs->next = NULL; |
| |
| inputs->name = av_strdup("out"); |
| inputs->filter_ctx = buffersink_ctx; |
| inputs->pad_idx = 0; |
| inputs->next = NULL; |
| |
| if (!outputs->name || !inputs->name) { |
| ret = AVERROR(ENOMEM); |
| goto end; |
| } |
| |
| if ((ret = avfilter_graph_parse_ptr(filter_graph, filter_spec, |
| &inputs, &outputs, NULL)) < 0) |
| goto end; |
| |
| if ((ret = avfilter_graph_config(filter_graph, NULL)) < 0) |
| goto end; |
| |
| /* Fill FilteringContext */ |
| fctx->buffersrc_ctx = buffersrc_ctx; |
| fctx->buffersink_ctx = buffersink_ctx; |
| fctx->filter_graph = filter_graph; |
| |
| end: |
| avfilter_inout_free(&inputs); |
| avfilter_inout_free(&outputs); |
| |
| return ret; |
| } |
| |
| static int init_filters(void) |
| { |
| const char *filter_spec; |
| unsigned int i; |
| int ret; |
| filter_ctx = av_malloc_array(ifmt_ctx->nb_streams, sizeof(*filter_ctx)); |
| if (!filter_ctx) |
| return AVERROR(ENOMEM); |
| |
| for (i = 0; i < ifmt_ctx->nb_streams; i++) { |
| filter_ctx[i].buffersrc_ctx = NULL; |
| filter_ctx[i].buffersink_ctx = NULL; |
| filter_ctx[i].filter_graph = NULL; |
| if (!(ifmt_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO |
| || ifmt_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)) |
| continue; |
| |
| |
| if (ifmt_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) |
| filter_spec = "null"; /* passthrough (dummy) filter for video */ |
| else |
| filter_spec = "anull"; /* passthrough (dummy) filter for audio */ |
| ret = init_filter(&filter_ctx[i], ifmt_ctx->streams[i]->codec, |
| ofmt_ctx->streams[i]->codec, filter_spec); |
| if (ret) |
| return ret; |
| } |
| return 0; |
| } |
| |
| static int encode_write_frame(AVFrame *filt_frame, unsigned int stream_index, int *got_frame) { |
| int ret; |
| int got_frame_local; |
| AVPacket enc_pkt; |
| int (*enc_func)(AVCodecContext *, AVPacket *, const AVFrame *, int *) = |
| (ifmt_ctx->streams[stream_index]->codec->codec_type == |
| AVMEDIA_TYPE_VIDEO) ? avcodec_encode_video2 : avcodec_encode_audio2; |
| |
| if (!got_frame) |
| got_frame = &got_frame_local; |
| |
| av_log(NULL, AV_LOG_INFO, "Encoding frame\n"); |
| /* encode filtered frame */ |
| enc_pkt.data = NULL; |
| enc_pkt.size = 0; |
| av_init_packet(&enc_pkt); |
| ret = enc_func(ofmt_ctx->streams[stream_index]->codec, &enc_pkt, |
| filt_frame, got_frame); |
| av_frame_free(&filt_frame); |
| if (ret < 0) |
| return ret; |
| if (!(*got_frame)) |
| return 0; |
| |
| /* prepare packet for muxing */ |
| enc_pkt.stream_index = stream_index; |
| av_packet_rescale_ts(&enc_pkt, |
| ofmt_ctx->streams[stream_index]->codec->time_base, |
| ofmt_ctx->streams[stream_index]->time_base); |
| |
| av_log(NULL, AV_LOG_DEBUG, "Muxing frame\n"); |
| /* mux encoded frame */ |
| ret = av_interleaved_write_frame(ofmt_ctx, &enc_pkt); |
| return ret; |
| } |
| |
| static int filter_encode_write_frame(AVFrame *frame, unsigned int stream_index) |
| { |
| int ret; |
| AVFrame *filt_frame; |
| |
| av_log(NULL, AV_LOG_INFO, "Pushing decoded frame to filters\n"); |
| /* push the decoded frame into the filtergraph */ |
| ret = av_buffersrc_add_frame_flags(filter_ctx[stream_index].buffersrc_ctx, |
| frame, 0); |
| if (ret < 0) { |
| av_log(NULL, AV_LOG_ERROR, "Error while feeding the filtergraph\n"); |
| return ret; |
| } |
| |
| /* pull filtered frames from the filtergraph */ |
| while (1) { |
| filt_frame = av_frame_alloc(); |
| if (!filt_frame) { |
| ret = AVERROR(ENOMEM); |
| break; |
| } |
| av_log(NULL, AV_LOG_INFO, "Pulling filtered frame from filters\n"); |
| ret = av_buffersink_get_frame(filter_ctx[stream_index].buffersink_ctx, |
| filt_frame); |
| if (ret < 0) { |
| /* if no more frames for output - returns AVERROR(EAGAIN) |
| * if flushed and no more frames for output - returns AVERROR_EOF |
| * rewrite retcode to 0 to show it as normal procedure completion |
| */ |
| if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) |
| ret = 0; |
| av_frame_free(&filt_frame); |
| break; |
| } |
| |
| filt_frame->pict_type = AV_PICTURE_TYPE_NONE; |
| ret = encode_write_frame(filt_frame, stream_index, NULL); |
| if (ret < 0) |
| break; |
| } |
| |
| return ret; |
| } |
| |
| static int flush_encoder(unsigned int stream_index) |
| { |
| int ret; |
| int got_frame; |
| |
| if (!(ofmt_ctx->streams[stream_index]->codec->codec->capabilities & |
| AV_CODEC_CAP_DELAY)) |
| return 0; |
| |
| while (1) { |
| av_log(NULL, AV_LOG_INFO, "Flushing stream #%u encoder\n", stream_index); |
| ret = encode_write_frame(NULL, stream_index, &got_frame); |
| if (ret < 0) |
| break; |
| if (!got_frame) |
| return 0; |
| } |
| return ret; |
| } |
| |
| int main(int argc, char **argv) |
| { |
| int ret; |
| AVPacket packet = { .data = NULL, .size = 0 }; |
| AVFrame *frame = NULL; |
| enum AVMediaType type; |
| unsigned int stream_index; |
| unsigned int i; |
| int got_frame; |
| int (*dec_func)(AVCodecContext *, AVFrame *, int *, const AVPacket *); |
| |
| if (argc != 3) { |
| av_log(NULL, AV_LOG_ERROR, "Usage: %s <input file> <output file>\n", argv[0]); |
| return 1; |
| } |
| |
| av_register_all(); |
| avfilter_register_all(); |
| |
| if ((ret = open_input_file(argv[1])) < 0) |
| goto end; |
| if ((ret = open_output_file(argv[2])) < 0) |
| goto end; |
| if ((ret = init_filters()) < 0) |
| goto end; |
| |
| /* read all packets */ |
| while (1) { |
| if ((ret = av_read_frame(ifmt_ctx, &packet)) < 0) |
| break; |
| stream_index = packet.stream_index; |
| type = ifmt_ctx->streams[packet.stream_index]->codec->codec_type; |
| av_log(NULL, AV_LOG_DEBUG, "Demuxer gave frame of stream_index %u\n", |
| stream_index); |
| |
| if (filter_ctx[stream_index].filter_graph) { |
| av_log(NULL, AV_LOG_DEBUG, "Going to reencode&filter the frame\n"); |
| frame = av_frame_alloc(); |
| if (!frame) { |
| ret = AVERROR(ENOMEM); |
| break; |
| } |
| av_packet_rescale_ts(&packet, |
| ifmt_ctx->streams[stream_index]->time_base, |
| ifmt_ctx->streams[stream_index]->codec->time_base); |
| dec_func = (type == AVMEDIA_TYPE_VIDEO) ? avcodec_decode_video2 : |
| avcodec_decode_audio4; |
| ret = dec_func(ifmt_ctx->streams[stream_index]->codec, frame, |
| &got_frame, &packet); |
| if (ret < 0) { |
| av_frame_free(&frame); |
| av_log(NULL, AV_LOG_ERROR, "Decoding failed\n"); |
| break; |
| } |
| |
| if (got_frame) { |
| frame->pts = av_frame_get_best_effort_timestamp(frame); |
| ret = filter_encode_write_frame(frame, stream_index); |
| av_frame_free(&frame); |
| if (ret < 0) |
| goto end; |
| } else { |
| av_frame_free(&frame); |
| } |
| } else { |
| /* remux this frame without reencoding */ |
| av_packet_rescale_ts(&packet, |
| ifmt_ctx->streams[stream_index]->time_base, |
| ofmt_ctx->streams[stream_index]->time_base); |
| |
| ret = av_interleaved_write_frame(ofmt_ctx, &packet); |
| if (ret < 0) |
| goto end; |
| } |
| av_packet_unref(&packet); |
| } |
| |
| /* flush filters and encoders */ |
| for (i = 0; i < ifmt_ctx->nb_streams; i++) { |
| /* flush filter */ |
| if (!filter_ctx[i].filter_graph) |
| continue; |
| ret = filter_encode_write_frame(NULL, i); |
| if (ret < 0) { |
| av_log(NULL, AV_LOG_ERROR, "Flushing filter failed\n"); |
| goto end; |
| } |
| |
| /* flush encoder */ |
| ret = flush_encoder(i); |
| if (ret < 0) { |
| av_log(NULL, AV_LOG_ERROR, "Flushing encoder failed\n"); |
| goto end; |
| } |
| } |
| |
| av_write_trailer(ofmt_ctx); |
| end: |
| av_packet_unref(&packet); |
| av_frame_free(&frame); |
| for (i = 0; i < ifmt_ctx->nb_streams; i++) { |
| avcodec_close(ifmt_ctx->streams[i]->codec); |
| if (ofmt_ctx && ofmt_ctx->nb_streams > i && ofmt_ctx->streams[i] && ofmt_ctx->streams[i]->codec) |
| avcodec_close(ofmt_ctx->streams[i]->codec); |
| if (filter_ctx && filter_ctx[i].filter_graph) |
| avfilter_graph_free(&filter_ctx[i].filter_graph); |
| } |
| av_free(filter_ctx); |
| avformat_close_input(&ifmt_ctx); |
| if (ofmt_ctx && !(ofmt_ctx->oformat->flags & AVFMT_NOFILE)) |
| avio_closep(&ofmt_ctx->pb); |
| avformat_free_context(ofmt_ctx); |
| |
| if (ret < 0) |
| av_log(NULL, AV_LOG_ERROR, "Error occurred: %s\n", av_err2str(ret)); |
| |
| return ret ? 1 : 0; |
| } |
