63 lines
1.6 KiB
C++
63 lines
1.6 KiB
C++
#include "ffmpegvideodecoder.h"
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#include <QDebug>
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FFmpegVideoDecoder::FFmpegVideoDecoder()
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{
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}
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FramePtr FFmpegVideoDecoder::Retrieve(const rational &timecode, const rational &length)
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{
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// TODO index frames
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int receive_ret;
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// Allocate new frame
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AVFrame* frame = av_frame_alloc();
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AVPacket* pkt = av_packet_alloc();
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while ((receive_ret = avcodec_receive_frame(codec_ctx_, frame)) == AVERROR(EAGAIN)) {
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int read_ret = 0;
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do {
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// Make sure any previous packet buffers are cleared before reading new ones
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av_packet_unref(pkt);
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// Read next packet from file
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read_ret = av_read_frame(fmt_ctx_, pkt);
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} while (read_ret >= 0 && pkt->stream_index != stream()->file_index);
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if (read_ret >= 0) {
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int send_ret = avcodec_send_packet(codec_ctx_, pkt);
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if (send_ret < 0) {
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qCritical() << "Failed to send packet to decoder." << send_ret;
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return nullptr;
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}
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} else {
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if (read_ret == AVERROR_EOF) {
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int send_ret = avcodec_send_packet(codec_ctx_, nullptr);
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if (send_ret < 0) {
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qCritical() << "Failed to send packet to decoder." << send_ret;
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return nullptr;
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}
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} else {
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qCritical() << "Could not read frame." << read_ret;
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return nullptr;
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}
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}
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}
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if (receive_ret < 0) {
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if (receive_ret != AVERROR_EOF) {
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qCritical() << "Failed to receive packet from decoder." << receive_ret;
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}
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}
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// Free AVPacket
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av_packet_free(&pkt);
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// AVFrame is wrapped in Frame object and shared ptr to automatically clear it
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return std::make_shared<Frame>(frame);
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}
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