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decoder: h264: add MVC profiles compatibility logic.

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Add safe fallbacks for MVC profiles:
- all MultiView High profile streams with 2 views at most can be decoded
  with a Stereo High profile compliant decoder ;
- all Stereo High profile streams with only progressive views can be
  decoded with a MultiView High profile compliant decoder ;
- all drivers that support slice-level decoding could normally support
  MVC profiles when the DPB holds at most 16 frames.
This commit is contained in:
Gwenole Beauchesne 2014-05-20 18:08:15 +02:00
parent 8c5e89c298
commit 5d76afb40d
1 changed files with 47 additions and 2 deletions
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49
gst-libs/gst/vaapi/gstvaapidecoder_h264.c
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@ -1102,8 +1102,39 @@ fill_profiles(GstVaapiProfile profiles[16], guint *n_profiles_ptr,
*n_profiles_ptr = n_profiles;
}
/* Fills in compatible profiles for MVC decoding */
static void
fill_profiles_mvc(GstVaapiDecoderH264 *decoder, GstVaapiProfile profiles[16],
guint *n_profiles_ptr, guint dpb_size)
{
const gchar * const vendor_string =
gst_vaapi_display_get_vendor_string(GST_VAAPI_DECODER_DISPLAY(decoder));
gboolean add_high_profile = FALSE;
struct map {
const gchar *str;
guint str_len;
};
const struct map *m;
// Drivers that support slice level decoding
if (vendor_string && dpb_size <= 16) {
static const struct map drv_names[] = {
{ "Intel i965 driver", 17 },
{ NULL, 0 }
};
for (m = drv_names; m->str != NULL && !add_high_profile; m++) {
if (g_ascii_strncasecmp(vendor_string, m->str, m->str_len) == 0)
add_high_profile = TRUE;
}
}
if (add_high_profile)
fill_profiles(profiles, n_profiles_ptr, GST_VAAPI_PROFILE_H264_HIGH);
}
static GstVaapiProfile
get_profile(GstVaapiDecoderH264 *decoder, GstH264SPS *sps)
get_profile(GstVaapiDecoderH264 *decoder, GstH264SPS *sps, guint dpb_size)
{
GstVaapiDecoderH264Private * const priv = &decoder->priv;
GstVaapiDisplay * const display = GST_VAAPI_DECODER_DISPLAY(decoder);
@ -1130,6 +1161,20 @@ get_profile(GstVaapiDecoderH264 *decoder, GstH264SPS *sps)
GST_VAAPI_PROFILE_H264_MAIN);
}
break;
case GST_VAAPI_PROFILE_H264_MULTIVIEW_HIGH:
if (priv->max_views == 2) {
fill_profiles(profiles, &n_profiles,
GST_VAAPI_PROFILE_H264_STEREO_HIGH);
}
fill_profiles_mvc(decoder, profiles, &n_profiles, dpb_size);
break;
case GST_VAAPI_PROFILE_H264_STEREO_HIGH:
if (sps->frame_mbs_only_flag) {
fill_profiles(profiles, &n_profiles,
GST_VAAPI_PROFILE_H264_MULTIVIEW_HIGH);
}
fill_profiles_mvc(decoder, profiles, &n_profiles, dpb_size);
break;
default:
break;
}
@ -1163,7 +1208,7 @@ ensure_context(GstVaapiDecoderH264 *decoder, GstH264SPS *sps)
reset_context = TRUE;
}
profile = get_profile(decoder, sps);
profile = get_profile(decoder, sps, dpb_size);
if (!profile) {
GST_ERROR("unsupported profile_idc %u", sps->profile_idc);
return GST_VAAPI_DECODER_STATUS_ERROR_UNSUPPORTED_PROFILE;