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// Adapted from
// https://github.com/leandromoreira/ffmpeg-libav-tutorial/blob/master/2_remuxing.c
// based on https://ffmpeg.org/doxygen/trunk/remuxing_8c-example.html
// FIXME: looks ugly, further refactor needed :(
#include <libavformat/avformat.h>
#include <libavutil/timestamp.h>
#include <stdio.h>
#include "../logger.h"
#include "ffmpeg.h"
int merge_av(const char *videofn, const char *audiofn, const char *outfn) {
AVFormatContext *input1_format_context = NULL, *input2_format_context = NULL,
*output_format_context = NULL;
AVPacket packet;
int ret, i;
int stream_index = 0;
int *streams_list = NULL;
int number_of_streams = 0;
if ((ret = avformat_open_input(&input1_format_context, videofn, NULL, NULL)) <
0) {
append_log("Could not open input file '%s'\n", videofn);
goto end;
}
if ((ret = avformat_open_input(&input2_format_context, audiofn, NULL, NULL)) <
0) {
append_log("Could not open input file '%s'\n", audiofn);
goto end;
}
if ((ret = avformat_find_stream_info(input1_format_context, NULL)) < 0) {
append_log("Failed to retrieve input stream information\n");
goto end;
}
if ((ret = avformat_find_stream_info(input2_format_context, NULL)) < 0) {
append_log("Failed to retrieve input stream information\n");
goto end;
}
avformat_alloc_output_context2(&output_format_context, NULL, NULL, outfn);
if (!output_format_context) {
append_log("Could not create output context\n");
ret = AVERROR_UNKNOWN;
goto end;
}
number_of_streams =
input1_format_context->nb_streams + input2_format_context->nb_streams;
streams_list = av_malloc_array(number_of_streams, sizeof(*streams_list));
if (!streams_list) {
ret = AVERROR(ENOMEM);
goto end;
}
for (i = 0; i < input1_format_context->nb_streams; i++) {
AVStream *out_stream;
AVStream *in_stream = input1_format_context->streams[i];
AVCodecParameters *in_codecpar = in_stream->codecpar;
if (in_codecpar->codec_type != AVMEDIA_TYPE_AUDIO &&
in_codecpar->codec_type != AVMEDIA_TYPE_VIDEO &&
in_codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE) {
streams_list[i] = -1;
continue;
}
streams_list[i] = stream_index++;
out_stream = avformat_new_stream(output_format_context, NULL);
if (!out_stream) {
append_log("Failed allocating output stream\n");
ret = AVERROR_UNKNOWN;
goto end;
}
ret = avcodec_parameters_copy(out_stream->codecpar, in_codecpar);
if (ret < 0) {
append_log("Failed to copy codec parameters\n");
goto end;
}
}
for (i = 0; i < input2_format_context->nb_streams; i++) {
AVStream *out_stream;
AVStream *in_stream = input2_format_context->streams[i];
AVCodecParameters *in_codecpar = in_stream->codecpar;
if (in_codecpar->codec_type != AVMEDIA_TYPE_AUDIO &&
in_codecpar->codec_type != AVMEDIA_TYPE_VIDEO &&
in_codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE) {
streams_list[i + stream_index] = -1;
continue;
}
streams_list[i + stream_index] = stream_index;
stream_index++;
out_stream = avformat_new_stream(output_format_context, NULL);
if (!out_stream) {
append_log("Failed allocating output stream\n");
ret = AVERROR_UNKNOWN;
goto end;
}
ret = avcodec_parameters_copy(out_stream->codecpar, in_codecpar);
if (ret < 0) {
append_log("Failed to copy codec parameters\n");
goto end;
}
}
#ifdef DEBUG
av_dump_format(input1_format_context, 0, videofn, 0);
av_dump_format(input2_format_context, 0, audiofn, 0);
av_dump_format(output_format_context, 0, outfn, 1);
#endif
if (!(output_format_context->oformat->flags & AVFMT_NOFILE)) {
ret = avio_open(&output_format_context->pb, outfn, AVIO_FLAG_WRITE);
if (ret < 0) {
append_log("Could not open output file '%s'", outfn);
goto end;
}
}
AVDictionary *opts = NULL;
/* Support fragmented MP4
* https://developer.mozilla.org/en-US/docs/Web/API/Media_Source_Extensions_API/Transcoding_assets_for_MSE
*/
av_dict_set(&opts, "movflags", "frag_keyframe+empty_moov+default_base_moof",
0);
ret = avformat_write_header(output_format_context, &opts);
if (ret < 0) {
append_log("Error occurred when opening output file\n");
goto end;
}
while (1) {
AVStream *in_stream, *out_stream;
ret = av_read_frame(input1_format_context, &packet);
if (ret < 0)
break;
in_stream = input1_format_context->streams[packet.stream_index];
if (packet.stream_index >= number_of_streams ||
streams_list[packet.stream_index] < 0) {
av_packet_unref(&packet);
continue;
}
packet.stream_index = streams_list[packet.stream_index];
out_stream = output_format_context->streams[packet.stream_index];
/* copy packet */
packet.pts = av_rescale_q_rnd(packet.pts, in_stream->time_base,
out_stream->time_base,
AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX);
packet.dts = av_rescale_q_rnd(packet.dts, in_stream->time_base,
out_stream->time_base,
AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX);
packet.duration = av_rescale_q(packet.duration, in_stream->time_base,
out_stream->time_base);
packet.pos = -1;
ret = av_interleaved_write_frame(output_format_context, &packet);
if (ret < 0) {
append_log("Error muxing packet\n");
break;
}
av_packet_unref(&packet);
}
while (1) {
AVStream *in_stream, *out_stream;
ret = av_read_frame(input2_format_context, &packet);
if (ret < 0)
break;
in_stream = input2_format_context->streams[packet.stream_index];
if (packet.stream_index >= number_of_streams ||
streams_list[packet.stream_index + input1_format_context->nb_streams] <
0) {
av_packet_unref(&packet);
continue;
}
packet.stream_index =
streams_list[packet.stream_index + input1_format_context->nb_streams];
out_stream = output_format_context->streams[packet.stream_index];
/* copy packet */
packet.pts = av_rescale_q_rnd(packet.pts, in_stream->time_base,
out_stream->time_base,
AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX);
packet.dts = av_rescale_q_rnd(packet.dts, in_stream->time_base,
out_stream->time_base,
AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX);
packet.duration = av_rescale_q(packet.duration, in_stream->time_base,
out_stream->time_base);
packet.pos = -1;
ret = av_interleaved_write_frame(output_format_context, &packet);
if (ret < 0) {
append_log("Error muxing packet\n");
break;
}
av_packet_unref(&packet);
}
av_write_trailer(output_format_context);
end:
avformat_close_input(&input1_format_context);
avformat_close_input(&input2_format_context);
/* close output */
if (output_format_context &&
!(output_format_context->oformat->flags & AVFMT_NOFILE))
avio_closep(&output_format_context->pb);
avformat_free_context(output_format_context);
av_freep(&streams_list);
if (ret < 0 && ret != AVERROR_EOF) {
append_log("Error occurred: %s\n", av_err2str(ret));
return 1;
}
// Delete seperate files
if (remove(videofn) != 0) {
append_log("Error deleting partial file %s\n", videofn);
}
if (remove(audiofn) != 0) {
append_log("Error deleting partial file %s\n", audiofn);
}
return 0;
}
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