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Use EOS to force decoder test frame output

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This commit is contained in:
Cameron Gutman
2026-01-16 01:08:51 -06:00
parent 198a208b44
commit 66a30c66f3
1 changed files with 28 additions and 33 deletions
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61
app/streaming/video/ffmpeg.cpp
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@@ -664,6 +664,27 @@ bool FFmpegVideoDecoder::completeInitialization(const AVCodec* decoder, enum AVP
return false;
}
// Most FFmpeg decoders process input using a "push" model.
// We'll see those fail here if the format is not supported.
err = avcodec_send_packet(m_VideoDecoderCtx, m_Pkt);
if (err < 0) {
char errorstring[512];
av_strerror(err, errorstring, sizeof(errorstring));
SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
"Test decode failed (avcodec_send_packet): %s", errorstring);
return false;
}
// Signal EOS to force the decoder to immediately output the frame
err = avcodec_send_packet(m_VideoDecoderCtx, nullptr);
if (err < 0) {
char errorstring[512];
av_strerror(err, errorstring, sizeof(errorstring));
SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
"Test flush failed (avcodec_send_packet): %s", errorstring);
return false;
}
AVFrame* frame = av_frame_alloc();
if (!frame) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
@@ -671,35 +692,17 @@ bool FFmpegVideoDecoder::completeInitialization(const AVCodec* decoder, enum AVP
return false;
}
// Some decoders won't output on the first frame, so we'll submit
// a few test frames if we get an EAGAIN error.
for (int retries = 0; retries < 5; retries++) {
// Most FFmpeg decoders process input using a "push" model.
// We'll see those fail here if the format is not supported.
err = avcodec_send_packet(m_VideoDecoderCtx, m_Pkt);
if (err < 0) {
av_frame_free(&frame);
char errorstring[512];
av_strerror(err, errorstring, sizeof(errorstring));
err = avcodec_receive_frame(m_VideoDecoderCtx, frame);
if (err == 0) {
// Allow the renderer to do any validation it wants on this frame
if (!m_FrontendRenderer->testRenderFrame(frame)) {
SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
"Test decode failed (avcodec_send_packet): %s", errorstring);
"Test decode failed (testRenderFrame)");
av_frame_free(&frame);
return false;
}
// A few FFmpeg decoders (h264_mmal) process here using a "pull" model.
// Those decoders will fail here if the format is not supported.
err = avcodec_receive_frame(m_VideoDecoderCtx, frame);
if (err == AVERROR(EAGAIN)) {
// Wait a little while to let the hardware work
SDL_Delay(100);
}
else {
// Done!
break;
}
}
if (err < 0) {
else if (err < 0) {
char errorstring[512];
av_strerror(err, errorstring, sizeof(errorstring));
SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
@@ -708,14 +711,6 @@ bool FFmpegVideoDecoder::completeInitialization(const AVCodec* decoder, enum AVP
return false;
}
// Allow the renderer to do any validation it wants on this frame
if (!m_FrontendRenderer->testRenderFrame(frame)) {
SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
"Test decode failed (testRenderFrame)");
av_frame_free(&frame);
return false;
}
av_frame_free(&frame);
// Flush the codec to prepare for the real stream if we're