#include <assert.h>
+#include <algorithm>
+#include <mutex>
#include <string>
#include <vector>
using namespace std;
-Mux::Mux(AVFormatContext *avctx, int width, int height, Codec video_codec, const AVCodec *codec_audio, int time_base, int bit_rate)
+struct PacketBefore {
+ PacketBefore(const AVFormatContext *ctx) : ctx(ctx) {}
+
+ bool operator() (const AVPacket *a, const AVPacket *b) const {
+ int64_t a_dts = (a->dts == AV_NOPTS_VALUE ? a->pts : a->dts);
+ int64_t b_dts = (b->dts == AV_NOPTS_VALUE ? b->pts : b->dts);
+ AVRational a_timebase = ctx->streams[a->stream_index]->time_base;
+ AVRational b_timebase = ctx->streams[b->stream_index]->time_base;
+ if (av_compare_ts(a_dts, a_timebase, b_dts, b_timebase) != 0) {
+ return av_compare_ts(a_dts, a_timebase, b_dts, b_timebase) < 0;
+ } else {
+ return av_compare_ts(a->pts, a_timebase, b->pts, b_timebase) < 0;
+ }
+ }
+
+ const AVFormatContext * const ctx;
+};
+
+Mux::Mux(AVFormatContext *avctx, int width, int height, Codec video_codec, const string &video_extradata, const AVCodecContext *audio_ctx, int time_base)
: avctx(avctx)
{
AVCodec *codec_video = avcodec_find_encoder((video_codec == CODEC_H264) ? AV_CODEC_ID_H264 : AV_CODEC_ID_RAWVIDEO);
avstream_video->codec->color_range = AVCOL_RANGE_MPEG; // Full vs. limited range (output_ycbcr_format.full_range).
avstream_video->codec->chroma_sample_location = AVCHROMA_LOC_LEFT; // Chroma sample location. See chroma_offset_0[] in Mixer::subsample_chroma().
avstream_video->codec->field_order = AV_FIELD_PROGRESSIVE;
- if (avctx->oformat->flags & AVFMT_GLOBALHEADER) {
- avstream_video->codec->flags = AV_CODEC_FLAG_GLOBAL_HEADER;
+
+ if (!video_extradata.empty()) {
+ avstream_video->codec->extradata = (uint8_t *)av_malloc(video_extradata.size());
+ avstream_video->codec->extradata_size = video_extradata.size();
+ memcpy(avstream_video->codec->extradata, video_extradata.data(), video_extradata.size());
}
- avstream_audio = avformat_new_stream(avctx, codec_audio);
+ avstream_audio = avformat_new_stream(avctx, nullptr);
if (avstream_audio == nullptr) {
fprintf(stderr, "avformat_new_stream() failed\n");
exit(1);
}
avstream_audio->time_base = AVRational{1, time_base};
- avstream_audio->codec->bit_rate = bit_rate;
- avstream_audio->codec->sample_rate = OUTPUT_FREQUENCY;
- avstream_audio->codec->channels = 2;
- avstream_audio->codec->channel_layout = AV_CH_LAYOUT_STEREO;
- avstream_audio->codec->time_base = AVRational{1, time_base};
- if (avctx->oformat->flags & AVFMT_GLOBALHEADER) {
- avstream_audio->codec->flags = AV_CODEC_FLAG_GLOBAL_HEADER;
- }
+ avcodec_copy_context(avstream_audio->codec, audio_ctx);
AVDictionary *options = NULL;
vector<pair<string, string>> opts = MUX_OPTS;
fprintf(stderr, "avformat_write_header() failed\n");
exit(1);
}
+
+ // Make sure the header is written before the constructor exits.
+ avio_flush(avctx->pb);
}
Mux::~Mux()
void Mux::add_packet(const AVPacket &pkt, int64_t pts, int64_t dts)
{
- if (!seen_keyframe && !(pkt.stream_index == 0 && (pkt.flags & AV_PKT_FLAG_KEY))) {
- // Wait until we see the first (video) key frame.
- return;
- }
- seen_keyframe = true;
-
AVPacket pkt_copy;
- av_copy_packet(&pkt_copy, &pkt);
+ if (av_copy_packet(&pkt_copy, &pkt) < 0) {
+ fprintf(stderr, "av_copy_packet() failed\n");
+ exit(1);
+ }
if (pkt.stream_index == 0) {
pkt_copy.pts = av_rescale_q(pts, AVRational{1, TIMEBASE}, avstream_video->time_base);
pkt_copy.dts = av_rescale_q(dts, AVRational{1, TIMEBASE}, avstream_video->time_base);
+ pkt_copy.duration = av_rescale_q(pkt.duration, AVRational{1, TIMEBASE}, avstream_video->time_base);
} else if (pkt.stream_index == 1) {
pkt_copy.pts = av_rescale_q(pts, AVRational{1, TIMEBASE}, avstream_audio->time_base);
pkt_copy.dts = av_rescale_q(dts, AVRational{1, TIMEBASE}, avstream_audio->time_base);
+ pkt_copy.duration = av_rescale_q(pkt.duration, AVRational{1, TIMEBASE}, avstream_audio->time_base);
} else {
assert(false);
}
- if (av_interleaved_write_frame(avctx, &pkt_copy) < 0) {
+ {
+ lock_guard<mutex> lock(mu);
+ if (plug_count > 0) {
+ plugged_packets.push_back(av_packet_clone(&pkt_copy));
+ } else {
+ write_packet_or_die(pkt_copy);
+ }
+ }
+
+ av_packet_unref(&pkt_copy);
+}
+
+void Mux::write_packet_or_die(const AVPacket &pkt)
+{
+ if (av_interleaved_write_frame(avctx, const_cast<AVPacket *>(&pkt)) < 0) {
fprintf(stderr, "av_interleaved_write_frame() failed\n");
exit(1);
}
+ avio_flush(avctx->pb);
+}
- av_packet_unref(&pkt_copy);
+void Mux::plug()
+{
+ lock_guard<mutex> lock(mu);
+ ++plug_count;
}
+void Mux::unplug()
+{
+ lock_guard<mutex> lock(mu);
+ if (--plug_count > 0) {
+ return;
+ }
+ assert(plug_count >= 0);
+
+ sort(plugged_packets.begin(), plugged_packets.end(), PacketBefore(avctx));
+
+ for (AVPacket *pkt : plugged_packets) {
+ write_packet_or_die(*pkt);
+ av_packet_free(&pkt);
+ }
+ plugged_packets.clear();
+}