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#include "transmuxer.h"
#include "ringbuf.h"
#include <bits/pthreadtypes.h>
#include <libavformat/avformat.h>
#include <libavformat/avio.h>
#include <libavutil/mem.h>
#include <libavutil/timestamp.h>
#include <pthread.h>
#include <stdlib.h>
static int wait_for_new_stream(Transmuxer *self) {
while (pthread_cond_wait(&self->streaming_cond, &self->lock)) {
if (self->quit) {
return 0;
}
if (self->stream != NULL) break;
}
return 1;
}
typedef struct {
AVStream *audio_stream;
AVStream *video_stream;
} StreamPair;
#define OUT_VIDEO_STREAM_INDEX 0
#define OUT_AUDIO_STREAM_INDEX 1
static StreamPair start_new_output_file(
AVFormatContext *in_fmt_ctx,
AVFormatContext **out_fmt_ctx,
const char *out_filename,
int aidx, int vidx) {
avformat_alloc_output_context2(out_fmt_ctx, NULL, "mpegts", out_filename);
AVStream *out_video_stream = avformat_new_stream(*out_fmt_ctx, NULL);
AVStream *out_audio_stream = avformat_new_stream(*out_fmt_ctx, NULL);
avcodec_parameters_copy(out_video_stream->codecpar, in_fmt_ctx->streams[vidx]->codecpar);
avcodec_parameters_copy(out_audio_stream->codecpar, in_fmt_ctx->streams[aidx]->codecpar);
if (!((*out_fmt_ctx)->oformat->flags & AVFMT_NOFILE)) {
if (avio_open(&(*out_fmt_ctx)->pb, out_filename, AVIO_FLAG_WRITE) < 0) {
fprintf(stderr, "Could not open output file '%s'\n", out_filename);
exit(-1);
}
}
if (avformat_write_header(*out_fmt_ctx, NULL) < 0) {
fprintf(stderr, "avformat_write_header failed.\n");
abort();
}
return (StreamPair) {
.audio_stream = out_audio_stream,
.video_stream = out_video_stream,
};
}
static int RingBuffer_avio_read(void *ctx, uint8_t *buf, int buf_size) {
RingBuffer *rb = ctx;
size_t n = RingBuffer_read(rb, buf, buf_size);
if (n == 0 && buf_size > 0) {
return AVERROR_EOF;
}
return (int)n;
}
AVIOContext* create_avio_from_ringbuffer(RingBuffer *rb, int buffer_size) {
uint8_t *avio_buf = av_malloc(buffer_size);
AVIOContext *avio = avio_alloc_context(
avio_buf, buffer_size,
0,
rb,
RingBuffer_avio_read,
NULL,
NULL);
return avio;
}
static void finalize_output_file(AVFormatContext *out_fmt_ctx) {
av_write_trailer(out_fmt_ctx);
if (!(out_fmt_ctx->oformat->flags & AVFMT_NOFILE)) {
avio_closep(&out_fmt_ctx->pb);
}
avformat_free_context(out_fmt_ctx);
// TODO: update m3u8
}
#define SEGMENT_DURATION 5
void* Transmuxer_main (void *vself) {
Transmuxer *self = vself;
pthread_mutex_lock(&self->lock);
while (wait_for_new_stream(self)) {
AVFormatContext *in_fmt_ctx = avformat_alloc_context();
in_fmt_ctx->pb = create_avio_from_ringbuffer(self->stream, 4096);
const AVInputFormat *flv_fmt = av_find_input_format("flv");
if (avformat_open_input(&in_fmt_ctx, NULL, flv_fmt, NULL) < 0) {
fprintf(stderr, "Could not open input file\n");
abort();
}
if (avformat_find_stream_info(in_fmt_ctx, NULL) < 0) {
fprintf(stderr, "Could not find stream info\n");
abort();
}
int video_stream_index = -1, audio_stream_index = -1;
for (int i = 0; i < in_fmt_ctx->nb_streams; i++) {
if (in_fmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
video_stream_index = i;
else if (in_fmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO)
audio_stream_index = i;
}
if (video_stream_index < 0) {
fprintf(stderr, "No video stream found\n");
abort();
}
if (audio_stream_index < 0) {
fprintf(stderr, "No audio stream found\n");
abort();
}
AVFormatContext *out_fmt_ctx = NULL;
int segment_index = 0;
int64_t segment_start_pts = 0;
char out_filename[256];
snprintf(out_filename, sizeof(out_filename), "segment_%03d.ts", segment_index);
int64_t pts_time;
AVPacket pkt;
StreamPair output_stream = start_new_output_file(
in_fmt_ctx, &out_fmt_ctx, out_filename, audio_stream_index, video_stream_index);
while (av_read_frame(in_fmt_ctx, &pkt) >= 0) {
AVStream *in_stream = in_fmt_ctx->streams[pkt.stream_index];
AVStream *out_stream = NULL;
if (pkt.stream_index == video_stream_index)
out_stream = output_stream.video_stream;
else if (pkt.stream_index == audio_stream_index)
out_stream = output_stream.audio_stream;
else {
av_packet_unref(&pkt);
continue;
}
pts_time = av_rescale_q(pkt.pts, in_stream->time_base, AV_TIME_BASE_Q);
// if need split
if (pts_time - segment_start_pts >= SEGMENT_DURATION * AV_TIME_BASE) {
if (pkt.stream_index == video_stream_index && (pkt.flags & AV_PKT_FLAG_KEY)) {
// close current ts
printf("new ts: %ld\n", pts_time - segment_start_pts);
finalize_output_file(out_fmt_ctx);
// open new ts
segment_index++;
segment_start_pts = pts_time;
snprintf(out_filename, sizeof(out_filename), "segment_%03d.ts", segment_index);
output_stream = start_new_output_file(in_fmt_ctx, &out_fmt_ctx, out_filename, audio_stream_index, video_stream_index);
}
}
pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
pkt.duration = av_rescale_q(pkt.duration, in_stream->time_base, out_stream->time_base);
pkt.pos = -1;
pkt.stream_index = (pkt.stream_index == audio_stream_index) ? OUT_AUDIO_STREAM_INDEX : OUT_VIDEO_STREAM_INDEX;
av_interleaved_write_frame(out_fmt_ctx, &pkt);
av_packet_unref(&pkt);
}
printf("new ts: %ld\n", pts_time - segment_start_pts);
finalize_output_file(out_fmt_ctx);
av_free(in_fmt_ctx->pb->buffer);
avio_context_free(&in_fmt_ctx->pb);
avformat_close_input(&in_fmt_ctx);
RingBuffer_destroy(self->stream);
self->stream = NULL;
free(self->stream);
}
pthread_mutex_unlock(&self->lock);
return NULL;
}
void Transmuxer_init(Transmuxer *self) {
pthread_mutex_init(&self->lock, NULL);
pthread_cond_init(&self->streaming_cond, NULL);
self->stream = NULL;
self->quit = false;
}
void Transmuxer_new_stream(Transmuxer *self, RingBuffer *ringbuf) {
pthread_mutex_lock(&self->lock);
self->stream = ringbuf;
pthread_mutex_unlock(&self->lock);
pthread_cond_signal(&self->streaming_cond);
}
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