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| 1 | +// main.cpp |
| 2 | + |
| 3 | +extern "C" { |
| 4 | +#include <libavformat/avformat.h> |
| 5 | +#include <libavutil/timestamp.h> |
| 6 | +} |
| 7 | + |
| 8 | +#include <iostream> |
| 9 | +#include <unistd.h> |
| 10 | + |
| 11 | +int main(int argc, char* argv[]) { |
| 12 | + if (argc < 2) { |
| 13 | + std::cerr << "Usage: " << argv[0] << " <video_file>" << std::endl; |
| 14 | + return 1; |
| 15 | + } |
| 16 | + |
| 17 | + const char* input_file = argv[1]; |
| 18 | + AVPacket* packet = av_packet_alloc(); |
| 19 | + if (!packet) { |
| 20 | + std::cerr << "FileCapturer::Start av_packet_alloc fail"; |
| 21 | + return -1; |
| 22 | + } |
| 23 | + av_init_packet(packet); |
| 24 | + |
| 25 | + AVFormatContext* format_context = nullptr; |
| 26 | + int error = |
| 27 | + avformat_open_input(&format_context, input_file, nullptr, nullptr); |
| 28 | + if (error < 0) { |
| 29 | + std::cerr << "FileCapturer::Start avformat_open_input fail " |
| 30 | + << input_file << " " << error;//av_err2str(error); |
| 31 | + av_packet_free(&packet); |
| 32 | + return -2; |
| 33 | + } |
| 34 | + |
| 35 | + error = avformat_find_stream_info(format_context, nullptr); |
| 36 | + if (error < 0) { |
| 37 | + std::cerr << "FileCapturer::Start avformat_find_stream_info fail " |
| 38 | + << error;//av_err2str(error); |
| 39 | + av_packet_free(&packet); |
| 40 | + avformat_close_input(&format_context); |
| 41 | + return -3; |
| 42 | + } |
| 43 | + |
| 44 | + int v_stream_no = av_find_best_stream(format_context, AVMEDIA_TYPE_VIDEO, -1, |
| 45 | + -1, nullptr, 0); |
| 46 | + if (v_stream_no < 0 || |
| 47 | + format_context->streams[v_stream_no]->time_base.den <= 0) { |
| 48 | + std::cerr << "FileCapturer::Start av_find_best_stream fail " |
| 49 | + << v_stream_no;//av_err2str(v_stream_no); |
| 50 | + av_packet_free(&packet); |
| 51 | + avformat_close_input(&format_context); |
| 52 | + return -4; |
| 53 | + } |
| 54 | + AVStream* v_stream = format_context->streams[v_stream_no]; |
| 55 | + |
| 56 | + bool first_packet = true; |
| 57 | + int64_t last_pts_ms = 0; |
| 58 | + int64_t emit_next_packet_ms = 0; |
| 59 | + |
| 60 | + bool need_loop_again = false; |
| 61 | + bool running_ = true; |
| 62 | + while (running_) { |
| 63 | + int ret = av_read_frame(format_context, packet); |
| 64 | + if (ret < 0 && ret != AVERROR_EOF) { |
| 65 | + std::cerr << "FileCapturer::Start av_read_frame fail " |
| 66 | + << ret;//av_err2str(ret); |
| 67 | + running_ = false; |
| 68 | + break; |
| 69 | + } |
| 70 | + if (ret == AVERROR_EOF) { |
| 71 | + if (true) { |
| 72 | + std::cerr << "FileCapturer::Start got EOF, loop again"; |
| 73 | + running_ = false; |
| 74 | + need_loop_again = true; |
| 75 | + break; |
| 76 | + } else { |
| 77 | + std::cerr << "FileCapturer::Start got EOF, quit"; |
| 78 | + running_ = false; |
| 79 | + break; |
| 80 | + } |
| 81 | + } |
| 82 | + if (packet->stream_index != v_stream->index) { |
| 83 | + continue; |
| 84 | + } |
| 85 | + int64_t now_ms = 0;//rtc::TimeMicros() / 1000; |
| 86 | + int64_t this_pts_ms = 1000 * packet->pts * v_stream->time_base.num / |
| 87 | + v_stream->time_base.den; |
| 88 | + if (first_packet) { |
| 89 | + emit_next_packet_ms = now_ms; |
| 90 | + last_pts_ms = this_pts_ms; |
| 91 | + } |
| 92 | + emit_next_packet_ms += this_pts_ms - last_pts_ms; |
| 93 | + last_pts_ms = this_pts_ms; |
| 94 | + int sleep_ms = (int)(emit_next_packet_ms - now_ms); |
| 95 | + |
| 96 | + // 获取流的时间基 |
| 97 | + AVRational time_base = v_stream->time_base; |
| 98 | + |
| 99 | + // 将 pts 转换为毫秒 |
| 100 | + int64_t pts_ms = av_rescale_q(packet->pts, time_base, (AVRational){1, 1000}); |
| 101 | + first_packet = false; |
| 102 | + printf("av_read_frame packet->stream_index %d, v_stream->index %d, v_stream_no %d, packet->pts %d, v_stream->time_base.num %d, v_stream->time_base.den %d, this_pts_ms %d, pts_ms %d\n", packet->stream_index, v_stream->index, v_stream_no, (int) packet->pts, v_stream->time_base.num, v_stream->time_base.den, (int) this_pts_ms, (int) pts_ms); |
| 103 | + |
| 104 | + if (!first_packet && sleep_ms > 5) { |
| 105 | + #if defined(WEBRTC_WIN) |
| 106 | + Sleep(sleep_ms); |
| 107 | + #else |
| 108 | + usleep(sleep_ms * 1000); |
| 109 | + #endif |
| 110 | + } |
| 111 | + |
| 112 | + // if (video_callback_ && running_) { |
| 113 | + // rtc::scoped_refptr<webrtc::TransitVideoFrameBuffer> frame_buffer = |
| 114 | + // rtc::make_ref_counted<webrtc::TransitVideoFrameBuffer>( |
| 115 | + // width_, height_, packet->size); |
| 116 | + // memcpy(frame_buffer->mutable_data(), packet->data, packet->size); |
| 117 | + |
| 118 | + // video_callback_->OnFrame( |
| 119 | + // VideoFrame::Builder() |
| 120 | + // .set_video_frame_buffer(frame_buffer) |
| 121 | + // .set_rotation(VideoRotation::kVideoRotation_0) |
| 122 | + // .set_dummy(false) |
| 123 | + // .set_transit(true) |
| 124 | + // .set_rtp_timestamp(0) |
| 125 | + // .set_timestamp_ms(rtc::TimeMillis()) |
| 126 | + // .build()); |
| 127 | + // } |
| 128 | + } |
| 129 | + |
| 130 | + av_packet_free(&packet); |
| 131 | + avformat_close_input(&format_context); |
| 132 | + |
| 133 | + return 0; |
| 134 | +} |
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