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ffmpeg_opt: consider HW acceleration method when selecting decoder 

Usually a HW decoder is expected when user specifies a HW acceleration
method via -hwaccel option, however the current implementation doesn't
take HW acceleration method into account, it is possible to select a SW
decoder.

For example:
$ ffmpeg -hwaccel vaapi -i av1.mp4 -f null -
$ ffmpeg -hwaccel nvdec -i av1.mp4 -f null -
$ ffmpeg -hwaccel vdpau -i av1.mp4 -f null -
[...]
Stream #0:0 -> #0:0 (av1 (libdav1d) -> wrapped_avframe (native))

libdav1d is selected in this case even if vaapi, nvdec or vdpau is
specified.

After applying this patch, the native av1 decoder (with vaapi, nvdec or
vdpau support) is selected for decoding(libdav1d is still used for
probing format).
$ ffmpeg -hwaccel vaapi -i av1.mp4 -f null -
$ ffmpeg -hwaccel nvdec -i av1.mp4 -f null -
$ ffmpeg -hwaccel vdpau -i av1.mp4 -f null -
[...]
Stream #0:0 -> #0:0 (av1 (native) -> wrapped_avframe (native))

Tested-by: Mario Roy <marioeroy@gmail.com>
Signed-off-by: Haihao Xiang <haihao.xiang@intel.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Haihao Xiang 2021-09-17 22:05:21 +08:00
parent df5defe15a
commit ad67ea9eee
1 changed files with 30 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
fftools/ffmpeg_opt.c
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@ -857,7 +857,9 @@ static const AVCodec *find_codec_or_die(const char *name, enum AVMediaType type,
return codec;
}
static const AVCodec *choose_decoder(OptionsContext *o, AVFormatContext *s, AVStream *st)
static const AVCodec *choose_decoder(OptionsContext *o, AVFormatContext *s, AVStream *st,
enum HWAccelID hwaccel_id, enum AVHWDeviceType hwaccel_device_type)
{
char *codec_name = NULL;
@ -868,9 +870,33 @@ static const AVCodec *choose_decoder(OptionsContext *o, AVFormatContext *s, AVSt
if (recast_media && st->codecpar->codec_type != codec->type)
st->codecpar->codec_type = codec->type;
return codec;
} else
} else {
if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
hwaccel_id == HWACCEL_GENERIC &&
hwaccel_device_type != AV_HWDEVICE_TYPE_NONE) {
const AVCodec *c;
void *i = NULL;
while ((c = av_codec_iterate(&i))) {
const AVCodecHWConfig *config;
if (c->id != st->codecpar->codec_id ||
!av_codec_is_decoder(c))
continue;
for (int j = 0; config = avcodec_get_hw_config(c, j); j++) {
if (config->device_type == hwaccel_device_type) {
av_log(NULL, AV_LOG_VERBOSE, "Selecting decoder '%s' because of requested hwaccel method %s\n",
c->name, av_hwdevice_get_type_name(hwaccel_device_type));
return c;
}
}
}
}
return avcodec_find_decoder(st->codecpar->codec_id);
}
}
static int guess_input_channel_layout(InputStream *ist)
{
@ -1003,7 +1029,7 @@ static void add_input_streams(OptionsContext *o, AVFormatContext *ic)
ist->hwaccel_pix_fmt = AV_PIX_FMT_NONE;
}
ist->dec = choose_decoder(o, ic, st);
ist->dec = choose_decoder(o, ic, st, ist->hwaccel_id, ist->hwaccel_device_type);
ist->decoder_opts = filter_codec_opts(o->g->codec_opts, ist->st->codecpar->codec_id, ic, st, ist->dec);
ist->reinit_filters = -1;
@ -1309,7 +1335,7 @@ static int open_input_file(OptionsContext *o, const char *filename)
/* apply forced codec ids */
for (i = 0; i < ic->nb_streams; i++)
choose_decoder(o, ic, ic->streams[i]);
choose_decoder(o, ic, ic->streams[i], HWACCEL_NONE, AV_HWDEVICE_TYPE_NONE);
if (find_stream_info) {
AVDictionary **opts = setup_find_stream_info_opts(ic, o->g->codec_opts);