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v4l2slh264dec: Request large enough bitstream buffer

Browse source 
The Cedrus driver would otherwise choose 1KB buffer, which is too small.
This follows what some drivers do, which is simply to use the size a
packed raw image would have. Specifications do not really guaranty any minimum
compression ratio.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1268>
This commit is contained in:
Nicolas Dufresne 2020-05-06 12:27:56 -04:00 committed by GStreamer Merge Bot
parent 037730a787
commit 2160239548
4 changed files with 43 additions and 4 deletions
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33
sys/v4l2codecs/gstv4l2codech264dec.c
View file

@ -190,6 +190,37 @@ gst_v4l2_codec_h264_dec_stop (GstVideoDecoder * decoder)
return GST_VIDEO_DECODER_CLASS (parent_class)->stop (decoder);
}
static gint
get_pixel_bitdepth (GstV4l2CodecH264Dec * self)
{
gint depth;
switch (self->chroma_format_idc) {
case 0:
/* 4:0:0 */
depth = self->bitdepth;
break;
case 1:
/* 4:2:0 */
depth = self->bitdepth + self->bitdepth / 2;
break;
case 2:
/* 4:2:2 */
depth = 2 * self->bitdepth;
break;
case 3:
/* 4:4:4 */
depth = 3 * self->bitdepth;
default:
GST_WARNING_OBJECT (self, "Unsupported chroma format %i",
self->chroma_format_idc);
depth = 0;
break;
}
return depth;
}
static gboolean
gst_v4l2_codec_h264_dec_negotiate (GstVideoDecoder * decoder)
{
@ -219,7 +250,7 @@ gst_v4l2_codec_h264_dec_negotiate (GstVideoDecoder * decoder)
gst_v4l2_decoder_streamoff (self->decoder, GST_PAD_SRC);
if (!gst_v4l2_decoder_set_sink_fmt (self->decoder, V4L2_PIX_FMT_H264_SLICE,
self->coded_width, self->coded_height)) {
self->coded_width, self->coded_height, get_pixel_bitdepth (self))) {
GST_ELEMENT_ERROR (self, CORE, NEGOTIATION,
("Failed to configure H264 decoder"),
("gst_v4l2_decoder_set_sink_fmt() failed: %s", g_strerror (errno)));

2
sys/v4l2codecs/gstv4l2codecvp8dec.c
View file

@ -159,7 +159,7 @@ gst_v4l2_codec_vp8_dec_negotiate (GstVideoDecoder * decoder)
gst_v4l2_decoder_streamoff (self->decoder, GST_PAD_SRC);
if (!gst_v4l2_decoder_set_sink_fmt (self->decoder, V4L2_PIX_FMT_VP8_FRAME,
self->width, self->height)) {
self->width, self->height, 12 /* 8 bits 4:2:0 */ )) {
GST_ELEMENT_ERROR (self, CORE, NEGOTIATION,
("Failed to configure VP8 decoder"),
("gst_v4l2_decoder_set_sink_fmt() failed: %s", g_strerror (errno)));

9
sys/v4l2codecs/gstv4l2decoder.c
View file

@ -270,7 +270,7 @@ gst_v4l2_decoder_enum_sink_fmt (GstV4l2Decoder * self, gint i,
gboolean
gst_v4l2_decoder_set_sink_fmt (GstV4l2Decoder * self, guint32 pix_fmt,
gint width, gint height)
gint width, gint height, gint pixel_bitdepth)
{
struct v4l2_format format = (struct v4l2_format) {
.type = self->sink_buf_type,
@ -282,6 +282,13 @@ gst_v4l2_decoder_set_sink_fmt (GstV4l2Decoder * self, guint32 pix_fmt,
},
};
gint ret;
/* Using raw image size for now, it is guarantied to be large enough */
gsize sizeimage = (width * height * pixel_bitdepth) / 8;
if (self->mplane)
format.fmt.pix_mp.plane_fmt[0].sizeimage = sizeimage;
else
format.fmt.pix.sizeimage = sizeimage;
ret = ioctl (self->video_fd, VIDIOC_S_FMT, &format);
if (ret < 0) {

3
sys/v4l2codecs/gstv4l2decoder.h
View file

@ -51,7 +51,8 @@ gboolean gst_v4l2_decoder_enum_sink_fmt (GstV4l2Decoder * self,
gint i, guint32 * out_fmt);
gboolean gst_v4l2_decoder_set_sink_fmt (GstV4l2Decoder * self, guint32 fmt,
gint width, gint height);
gint width, gint height,
gint pixel_bitdepth);
GstCaps * gst_v4l2_decoder_enum_src_formats (GstV4l2Decoder * self);