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Code Issues Releases Activity

avcodec/cuviddec: correctly handle buffer size and status when deinterlacing

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This commit is contained in:
Timo Rothenpieler
2025-02-25 19:39:43 +01:00
parent 330c8f8b93
commit 99e2af4e78
1 changed files with 13 additions and 11 deletions
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24
libavcodec/cuviddec.c
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@ -131,7 +131,7 @@ static int CUDAAPI cuvid_handle_video_sequence(void *opaque, CUVIDEOFORMAT* form
CUVIDDECODECREATEINFO cuinfo;
int surface_fmt;
int chroma_444;
int fifo_size_inc;
int old_nb_surfaces, fifo_size_inc, fifo_size_mul = 1;
int old_width = avctx->width;
int old_height = avctx->height;
@ -349,20 +349,24 @@ static int CUDAAPI cuvid_handle_video_sequence(void *opaque, CUVIDEOFORMAT* form
return 0;
}
fifo_size_inc = ctx->nb_surfaces;
ctx->nb_surfaces = FFMAX(ctx->nb_surfaces, format->min_num_decode_surfaces + 3);
if (ctx->deint_mode_current != cudaVideoDeinterlaceMode_Weave && !ctx->drop_second_field) {
avctx->framerate = av_mul_q(avctx->framerate, (AVRational){2, 1});
fifo_size_mul = 2;
}
old_nb_surfaces = ctx->nb_surfaces;
ctx->nb_surfaces = FFMAX(ctx->nb_surfaces, format->min_num_decode_surfaces + 3);
if (avctx->extra_hw_frames > 0)
ctx->nb_surfaces += avctx->extra_hw_frames;
fifo_size_inc = ctx->nb_surfaces - fifo_size_inc;
fifo_size_inc = ctx->nb_surfaces * fifo_size_mul - av_fifo_can_read(ctx->frame_queue) - av_fifo_can_write(ctx->frame_queue);
if (fifo_size_inc > 0 && av_fifo_grow2(ctx->frame_queue, fifo_size_inc) < 0) {
av_log(avctx, AV_LOG_ERROR, "Failed to grow frame queue on video sequence callback\n");
ctx->internal_error = AVERROR(ENOMEM);
return 0;
}
if (fifo_size_inc > 0 && av_reallocp_array(&ctx->key_frame, ctx->nb_surfaces, sizeof(int)) < 0) {
if (ctx->nb_surfaces > old_nb_surfaces && av_reallocp_array(&ctx->key_frame, ctx->nb_surfaces, sizeof(int)) < 0) {
av_log(avctx, AV_LOG_ERROR, "Failed to grow key frame array on video sequence callback\n");
ctx->internal_error = AVERROR(ENOMEM);
return 0;
@ -374,9 +378,6 @@ static int CUDAAPI cuvid_handle_video_sequence(void *opaque, CUVIDEOFORMAT* form
cuinfo.bitDepthMinus8 = format->bit_depth_luma_minus8;
cuinfo.DeinterlaceMode = ctx->deint_mode_current;
if (ctx->deint_mode_current != cudaVideoDeinterlaceMode_Weave && !ctx->drop_second_field)
avctx->framerate = av_mul_q(avctx->framerate, (AVRational){2, 1});
ctx->internal_error = CHECK_CU(ctx->cvdl->cuvidCreateDecoder(&ctx->cudecoder, &cuinfo));
if (ctx->internal_error < 0)
return 0;
@ -448,11 +449,12 @@ static int cuvid_is_buffer_full(AVCodecContext *avctx)
{
CuvidContext *ctx = avctx->priv_data;
int delay = ctx->cuparseinfo.ulMaxDisplayDelay;
int shift = 0;
if (ctx->deint_mode != cudaVideoDeinterlaceMode_Weave && !ctx->drop_second_field)
delay *= 2;
shift = 1;
return av_fifo_can_read(ctx->frame_queue) + delay >= ctx->nb_surfaces;
// shift/divide frame count to ensure the buffer is still signalled full if one half-frame has already been returned when deinterlacing.
return ((av_fifo_can_read(ctx->frame_queue) + shift) >> shift) + ctx->cuparseinfo.ulMaxDisplayDelay >= ctx->nb_surfaces;
}
static int cuvid_decode_packet(AVCodecContext *avctx, const AVPacket *avpkt)