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rsvgdec: Negotiate resolution with downstream and scale accordingly

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Prefer the resolution given by the input but if downstream request a
specific resolution then scale to this without regards to the aspect
ratio.

Fixes https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/issues/1538

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6613>
This commit is contained in:
Sebastian Dröge 2021-03-11 20:18:24 +02:00 committed by GStreamer Marge Bot
parent 46a41667a3
commit 5d876ff774
2 changed files with 61 additions and 15 deletions
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75
subprojects/gst-plugins-bad/ext/rsvg/gstrsvgdec.c
View file

@ -179,15 +179,64 @@ gst_rsvg_decode_image (GstRsvgDec * rsvg, GstBuffer * buffer,
output_state = gst_video_decoder_get_output_state (decoder);
if ((output_state == NULL)
|| GST_VIDEO_INFO_WIDTH (&output_state->info) != dimension.width
|| GST_VIDEO_INFO_HEIGHT (&output_state->info) != dimension.height) {
|| rsvg->dimension.width != dimension.width
|| rsvg->dimension.height != dimension.height) {
GstCaps *peer_caps;
GstCaps *source_caps;
GstCaps *templ_caps;
/* Create the output state */
if (output_state)
gst_video_codec_state_unref (output_state);
output_state =
gst_video_decoder_set_output_state (decoder, GST_RSVG_VIDEO_FORMAT,
dimension.width, dimension.height, rsvg->input_state);
templ_caps =
gst_pad_get_pad_template_caps (GST_VIDEO_DECODER_SRC_PAD (rsvg));
peer_caps =
gst_pad_peer_query_caps (GST_VIDEO_DECODER_SRC_PAD (rsvg), templ_caps);
GST_DEBUG_OBJECT (rsvg,
"Trying to negotiate for SVG resolution %ux%u with downstream caps %"
GST_PTR_FORMAT, dimension.width, dimension.height, peer_caps);
source_caps = gst_caps_make_writable (g_steal_pointer (&templ_caps));
gst_caps_set_simple (source_caps, "width", G_TYPE_INT, dimension.width,
"height", G_TYPE_INT, dimension.height, "pixel-aspect-ratio",
GST_TYPE_FRACTION, 1, 1, NULL);
if (gst_caps_can_intersect (source_caps, peer_caps)
|| gst_caps_is_empty (peer_caps)) {
GST_DEBUG_OBJECT (rsvg, "Using input resolution");
if (output_state)
gst_video_codec_state_unref (output_state);
output_state =
gst_video_decoder_set_output_state (decoder, GST_RSVG_VIDEO_FORMAT,
dimension.width, dimension.height, rsvg->input_state);
output_state->info.par_n = 1;
output_state->info.par_d = 1;
} else {
GstVideoInfo info;
GstStructure *s;
peer_caps = gst_caps_make_writable (peer_caps);
peer_caps = gst_caps_truncate (peer_caps);
s = gst_caps_get_structure (peer_caps, 0);
gst_structure_fixate_field_nearest_int (s, "width", dimension.width);
gst_structure_fixate_field_nearest_int (s, "height", dimension.height);
peer_caps = gst_caps_fixate (peer_caps);
gst_video_info_from_caps (&info, peer_caps);
if (output_state)
gst_video_codec_state_unref (output_state);
output_state =
gst_video_decoder_set_output_state (decoder, GST_RSVG_VIDEO_FORMAT,
info.width, info.height, rsvg->input_state);
GST_DEBUG_OBJECT (rsvg,
"Using resolution %ux%u with pixel-aspect-ratio %u/%u",
output_state->info.width, output_state->info.height,
output_state->info.par_n, output_state->info.par_d);
}
gst_clear_caps (&source_caps);
gst_clear_caps (&peer_caps);
rsvg->dimension = dimension;
}
ret = gst_video_decoder_allocate_output_frame (decoder, frame);
@ -236,6 +285,7 @@ gst_rsvg_decode_image (GstRsvgDec * rsvg, GstBuffer * buffer,
((gdouble) GST_VIDEO_INFO_HEIGHT (&output_state->info)) /
((gdouble) dimension.height);
}
cairo_scale (cr, scalex, scaley);
rsvg_handle_render_cairo (handle, cr);
@ -259,18 +309,11 @@ static gboolean
gst_rsvg_dec_set_format (GstVideoDecoder * decoder, GstVideoCodecState * state)
{
GstRsvgDec *rsvg = GST_RSVG_DEC (decoder);
GstVideoInfo *info = &state->info;
if (rsvg->input_state)
gst_video_codec_state_unref (rsvg->input_state);
rsvg->input_state = gst_video_codec_state_ref (state);
/* Create the output state */
state = gst_video_decoder_set_output_state (decoder, GST_RSVG_VIDEO_FORMAT,
GST_VIDEO_INFO_WIDTH (info), GST_VIDEO_INFO_HEIGHT (info),
rsvg->input_state);
gst_video_codec_state_unref (state);
return TRUE;
}
@ -370,5 +413,7 @@ gst_rsvg_dec_stop (GstVideoDecoder * decoder)
rsvg->input_state = NULL;
}
memset (&rsvg->dimension, 0, sizeof (RsvgDimensionData));
return TRUE;
}

1
subprojects/gst-plugins-bad/ext/rsvg/gstrsvgdec.h
View file

@ -57,6 +57,7 @@ struct _GstRsvgDec
guint64 frame_count;
GstVideoCodecState *input_state;
RsvgDimensionData dimension;
GstSegment segment;
gboolean need_newsegment;