99 lines
3.1 KiB
C
99 lines
3.1 KiB
C
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#include "recorder.h"
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#include <libavutil/time.h>
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#include "config.h"
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#include "log.h"
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static const AVOutputFormat *find_mp4_muxer(void) {
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void *opaque = NULL;
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const AVOutputFormat *oformat;
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do {
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oformat = av_muxer_iterate(&opaque);
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// until null or with name "mp4"
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} while (oformat && strcmp(oformat->name, "mp4"));
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return oformat;
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}
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SDL_bool recorder_init(struct recorder *recorder, const char *filename,
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struct size declared_frame_size) {
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recorder->filename = SDL_strdup(filename);
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if (!recorder->filename) {
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LOGE("Cannot strdup filename");
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return SDL_FALSE;
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}
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recorder->declared_frame_size = declared_frame_size;
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return SDL_TRUE;
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}
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void recorder_destroy(struct recorder *recorder) {
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SDL_free(recorder->filename);
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}
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SDL_bool recorder_open(struct recorder *recorder, AVCodec *input_codec) {
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const AVOutputFormat *mp4 = find_mp4_muxer();
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if (!mp4) {
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LOGE("Could not find mp4 muxer");
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return SDL_FALSE;
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}
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recorder->ctx = avformat_alloc_context();
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if (!recorder->ctx) {
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LOGE("Could not allocate output context");
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return SDL_FALSE;
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}
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// contrary to the deprecated API (av_oformat_next()), av_muxer_iterate()
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// returns (on purpose) a pointer-to-const, but AVFormatContext.oformat
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// still expects a pointer-to-non-const (it has not be updated accordingly)
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// <https://github.com/FFmpeg/FFmpeg/commit/0694d8702421e7aff1340038559c438b61bb30dd>
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recorder->ctx->oformat = (AVOutputFormat *) mp4;
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AVStream *ostream = avformat_new_stream(recorder->ctx, input_codec);
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if (!ostream) {
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avformat_free_context(recorder->ctx);
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return SDL_FALSE;
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}
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ostream->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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ostream->codecpar->codec_id = input_codec->id;
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ostream->codecpar->format = AV_PIX_FMT_YUV420P;
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ostream->codecpar->width = recorder->declared_frame_size.width;
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ostream->codecpar->height = recorder->declared_frame_size.height;
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ostream->time_base = (AVRational) {1, 1000000}; // timestamps in us
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int ret = avio_open(&recorder->ctx->pb, recorder->filename,
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AVIO_FLAG_WRITE);
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if (ret < 0) {
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LOGE("Failed to open output file: %s", recorder->filename);
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// ostream will be cleaned up during context cleaning
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avformat_free_context(recorder->ctx);
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return SDL_FALSE;
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}
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ret = avformat_write_header(recorder->ctx, NULL);
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if (ret < 0) {
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LOGE("Failed to write header to %s", recorder->filename);
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avio_closep(&recorder->ctx->pb);
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avformat_free_context(recorder->ctx);
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return SDL_FALSE;
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}
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return SDL_TRUE;
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}
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void recorder_close(struct recorder *recorder) {
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int ret = av_write_trailer(recorder->ctx);
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if (ret < 0) {
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LOGE("Failed to write trailer to %s", recorder->filename);
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}
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avio_close(recorder->ctx->pb);
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avformat_free_context(recorder->ctx);
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}
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SDL_bool recorder_write(struct recorder *recorder, AVPacket *packet) {
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return av_write_frame(recorder->ctx, packet) >= 0;
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}
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