scrcpy/app/src/recorder.c

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