+++ /dev/null
-#include "mux.h"
-
-#include <assert.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <algorithm>
-#include <mutex>
-#include <string>
-#include <utility>
-#include <vector>
-
-extern "C" {
-#include <libavformat/avio.h>
-#include <libavutil/avutil.h>
-#include <libavutil/dict.h>
-#include <libavutil/mathematics.h>
-#include <libavutil/mem.h>
-#include <libavutil/pixfmt.h>
-#include <libavutil/rational.h>
-}
-
-#include "defs.h"
-#include "flags.h"
-#include "metrics.h"
-#include "timebase.h"
-
-using namespace std;
-
-struct PacketBefore {
- PacketBefore(const AVFormatContext *ctx) : ctx(ctx) {}
-
- bool operator() (const Mux::QueuedPacket &a_qp, const Mux::QueuedPacket &b_qp) const {
- const AVPacket *a = a_qp.pkt;
- const AVPacket *b = b_qp.pkt;
- 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 AVCodecParameters *audio_codecpar, int time_base, std::function<void(int64_t)> write_callback, WriteStrategy write_strategy, const vector<MuxMetrics *> &metrics)
- : write_strategy(write_strategy), avctx(avctx), write_callback(write_callback), metrics(metrics)
-{
- avstream_video = avformat_new_stream(avctx, nullptr);
- if (avstream_video == nullptr) {
- fprintf(stderr, "avformat_new_stream() failed\n");
- exit(1);
- }
- avstream_video->time_base = AVRational{1, time_base};
- avstream_video->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
- if (video_codec == CODEC_H264) {
- avstream_video->codecpar->codec_id = AV_CODEC_ID_H264;
- } else {
- assert(video_codec == CODEC_NV12);
- avstream_video->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
- avstream_video->codecpar->codec_tag = avcodec_pix_fmt_to_codec_tag(AV_PIX_FMT_NV12);
- }
- avstream_video->codecpar->width = width;
- avstream_video->codecpar->height = height;
-
- // Colorspace details. Closely correspond to settings in EffectChain_finalize,
- // as noted in each comment.
- // Note that the H.264 stream also contains this information and depending on the
- // mux, this might simply get ignored. See sps_rbsp().
- // Note that there's no way to change this per-frame as the H.264 stream
- // would like to be able to.
- avstream_video->codecpar->color_primaries = AVCOL_PRI_BT709; // RGB colorspace (inout_format.color_space).
- avstream_video->codecpar->color_trc = AVCOL_TRC_IEC61966_2_1; // Gamma curve (inout_format.gamma_curve).
- // YUV colorspace (output_ycbcr_format.luma_coefficients).
- if (global_flags.ycbcr_rec709_coefficients) {
- avstream_video->codecpar->color_space = AVCOL_SPC_BT709;
- } else {
- avstream_video->codecpar->color_space = AVCOL_SPC_SMPTE170M;
- }
- avstream_video->codecpar->color_range = AVCOL_RANGE_MPEG; // Full vs. limited range (output_ycbcr_format.full_range).
- avstream_video->codecpar->chroma_location = AVCHROMA_LOC_LEFT; // Chroma sample location. See chroma_offset_0[] in Mixer::subsample_chroma().
- avstream_video->codecpar->field_order = AV_FIELD_PROGRESSIVE;
-
- if (!video_extradata.empty()) {
- avstream_video->codecpar->extradata = (uint8_t *)av_malloc(video_extradata.size());
- avstream_video->codecpar->extradata_size = video_extradata.size();
- memcpy(avstream_video->codecpar->extradata, video_extradata.data(), video_extradata.size());
- }
-
- 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};
- if (avcodec_parameters_copy(avstream_audio->codecpar, audio_codecpar) < 0) {
- fprintf(stderr, "avcodec_parameters_copy() failed\n");
- exit(1);
- }
-
- AVDictionary *options = NULL;
- vector<pair<string, string>> opts = MUX_OPTS;
- for (pair<string, string> opt : opts) {
- av_dict_set(&options, opt.first.c_str(), opt.second.c_str(), 0);
- }
- if (avformat_write_header(avctx, &options) < 0) {
- fprintf(stderr, "avformat_write_header() failed\n");
- exit(1);
- }
- for (MuxMetrics *metric : metrics) {
- metric->metric_written_bytes += avctx->pb->pos;
- }
-
- // Make sure the header is written before the constructor exits.
- avio_flush(avctx->pb);
-
- if (write_strategy == WRITE_BACKGROUND) {
- writer_thread = thread(&Mux::thread_func, this);
- }
-}
-
-Mux::~Mux()
-{
- assert(plug_count == 0);
- if (write_strategy == WRITE_BACKGROUND) {
- writer_thread_should_quit = true;
- packet_queue_ready.notify_all();
- writer_thread.join();
- }
- int64_t old_pos = avctx->pb->pos;
- av_write_trailer(avctx);
- for (MuxMetrics *metric : metrics) {
- metric->metric_written_bytes += avctx->pb->pos - old_pos;
- }
-
- if (!(avctx->oformat->flags & AVFMT_NOFILE) &&
- !(avctx->flags & AVFMT_FLAG_CUSTOM_IO)) {
- avio_closep(&avctx->pb);
- }
- avformat_free_context(avctx);
-}
-
-void Mux::add_packet(const AVPacket &pkt, int64_t pts, int64_t dts, AVRational timebase, int stream_index_override)
-{
- AVPacket pkt_copy;
- av_init_packet(&pkt_copy);
- if (av_packet_ref(&pkt_copy, &pkt) < 0) {
- fprintf(stderr, "av_copy_packet() failed\n");
- exit(1);
- }
- if (stream_index_override != -1) {
- pkt_copy.stream_index = stream_index_override;
- }
- if (pkt_copy.stream_index == 0) {
- pkt_copy.pts = av_rescale_q(pts, timebase, avstream_video->time_base);
- pkt_copy.dts = av_rescale_q(dts, timebase, avstream_video->time_base);
- pkt_copy.duration = av_rescale_q(pkt.duration, timebase, avstream_video->time_base);
- } else if (pkt_copy.stream_index == 1) {
- pkt_copy.pts = av_rescale_q(pts, timebase, avstream_audio->time_base);
- pkt_copy.dts = av_rescale_q(dts, timebase, avstream_audio->time_base);
- pkt_copy.duration = av_rescale_q(pkt.duration, timebase, avstream_audio->time_base);
- } else {
- assert(false);
- }
-
- {
- lock_guard<mutex> lock(mu);
- if (write_strategy == WriteStrategy::WRITE_BACKGROUND) {
- packet_queue.push_back(QueuedPacket{ av_packet_clone(&pkt_copy), pts });
- if (plug_count == 0) packet_queue_ready.notify_all();
- } else if (plug_count > 0) {
- packet_queue.push_back(QueuedPacket{ av_packet_clone(&pkt_copy), pts });
- } else {
- write_packet_or_die(pkt_copy, pts);
- }
- }
-
- av_packet_unref(&pkt_copy);
-}
-
-void Mux::write_packet_or_die(const AVPacket &pkt, int64_t unscaled_pts)
-{
- for (MuxMetrics *metric : metrics) {
- if (pkt.stream_index == 0) {
- metric->metric_video_bytes += pkt.size;
- } else if (pkt.stream_index == 1) {
- metric->metric_audio_bytes += pkt.size;
- } else {
- assert(false);
- }
- }
- int64_t old_pos = avctx->pb->pos;
- 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);
- for (MuxMetrics *metric : metrics) {
- metric->metric_written_bytes += avctx->pb->pos - old_pos;
- }
-
- if (pkt.stream_index == 0 && write_callback != nullptr) {
- write_callback(unscaled_pts);
- }
-}
-
-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(packet_queue.begin(), packet_queue.end(), PacketBefore(avctx));
-
- if (write_strategy == WRITE_BACKGROUND) {
- packet_queue_ready.notify_all();
- } else {
- for (QueuedPacket &qp : packet_queue) {
- write_packet_or_die(*qp.pkt, qp.unscaled_pts);
- av_packet_free(&qp.pkt);
- }
- packet_queue.clear();
- }
-}
-
-void Mux::thread_func()
-{
- unique_lock<mutex> lock(mu);
- for ( ;; ) {
- packet_queue_ready.wait(lock, [this]() {
- return writer_thread_should_quit || (!packet_queue.empty() && plug_count == 0);
- });
- if (writer_thread_should_quit && packet_queue.empty()) {
- // All done.
- break;
- }
-
- assert(!packet_queue.empty() && plug_count == 0);
- vector<QueuedPacket> packets;
- swap(packets, packet_queue);
-
- lock.unlock();
- for (QueuedPacket &qp : packets) {
- write_packet_or_die(*qp.pkt, qp.unscaled_pts);
- av_packet_free(&qp.pkt);
- }
- lock.lock();
- }
-}
-
-void MuxMetrics::init(const vector<pair<string, string>> &labels)
-{
- vector<pair<string, string>> labels_video = labels;
- labels_video.emplace_back("stream", "video");
- global_metrics.add("mux_stream_bytes", labels_video, &metric_video_bytes);
-
- vector<pair<string, string>> labels_audio = labels;
- labels_audio.emplace_back("stream", "audio");
- global_metrics.add("mux_stream_bytes", labels_audio, &metric_audio_bytes);
-
- global_metrics.add("mux_written_bytes", labels, &metric_written_bytes);
-}
projects / nageru / blobdiff