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vd_lavc: minor cleanup to hwdec fallback code

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The comment was largely outdated, and described the old situation when
we used a "violent" fallback by making get_buffer2 fail completely.

Also, for the case when the hw decoder initialization succeeded (in
get_format), but get_buffer2 for some reason requests something
unexpected, we also can fallback more gracefully and in the same way.
This commit is contained in:
wm4 2015-09-23 14:01:45 +02:00
parent 79f8ee2808
commit 4d6c1be7b6
1 changed files with 8 additions and 15 deletions
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23
video/decode/vd_lavc.c
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@ -568,23 +568,16 @@ static int get_buffer2_hwdec(AVCodecContext *avctx, AVFrame *pic, int flags)
struct dec_video *vd = avctx->opaque;
vd_ffmpeg_ctx *ctx = vd->priv;
if (ctx->hwdec_failed)
return avcodec_default_get_buffer2(avctx, pic, flags);
/* Decoders using ffmpeg's hwaccel architecture (everything except vdpau)
* can fall back to software decoding automatically. However, we don't
* want that: multithreading was already disabled. ffmpeg's fallback
* isn't really useful, and causes more trouble than it helps.
*
* Instead of trying to "adjust" the thread_count fields in avctx, let
* decoding fail hard. Then decode_with_fallback() will do our own software
* fallback. Fully reinitializing the decoder is saner, and will probably
* save us from other weird corner cases, like having to "reroute" the
* get_buffer callback.
*/
int imgfmt = pixfmt2imgfmt(pic->format);
if (!IMGFMT_IS_HWACCEL(imgfmt) || !ctx->hwdec)
return -1;
ctx->hwdec_failed = true;
/* Hardware decoding failed, and we will trigger a proper fallback later
* when returning from the decode call. (We are forcing complete
* reinitialization later to reset the thread count properly.)
*/
if (ctx->hwdec_failed)
return avcodec_default_get_buffer2(avctx, pic, flags);
// We expect it to use the exact size used to create the hw decoder in
// get_format_hwdec(). For cropped video, this is expected to be the