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ivfparse: detect and propagate resolution changes.

Browse source 
Detect resolution changes on key frames, and propagate the resulting
caps to the src pad. Only the uncompressed data chunk is decoded, so
avoid using the new VP8 bitstream parsing library for now.

Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
This commit is contained in:
Gwenole Beauchesne 2014-04-18 18:12:36 +02:00
parent 3b308cba3c
commit abadffd4d8
2 changed files with 72 additions and 15 deletions
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84
gst/ivfparse/gstivfparse.c
View file

@ -116,8 +116,11 @@ static void
gst_ivf_parse_reset (GstIvfParse * ivf)
{
ivf->state = GST_IVF_PARSE_START;
ivf->width = 0;
ivf->height = 0;
ivf->fps_n = 0;
ivf->fps_d = 0;
ivf->update_caps = FALSE;
}
/* initialize the new element
@ -168,6 +171,53 @@ gst_ivf_parse_stop (GstBaseParse * parse)
return TRUE;
}
static void
gst_ivf_parse_set_size (GstIvfParse * ivf, guint width, guint height)
{
if (ivf->width != width || ivf->height != height) {
GST_INFO_OBJECT (ivf, "resolution changed to %ux%u", width, height);
ivf->width = width;
ivf->height = height;
ivf->update_caps = TRUE;
}
}
static void
gst_ivf_parse_set_framerate (GstIvfParse * ivf, guint fps_n, guint fps_d)
{
if (ivf->fps_n != fps_n || ivf->fps_d != fps_d) {
GST_INFO_OBJECT (ivf, "framerate changed to %u/%u", fps_n, fps_d);
ivf->fps_n = fps_n;
ivf->fps_d = fps_d;
ivf->update_caps = TRUE;
}
}
static void
gst_ivf_parse_update_src_caps (GstIvfParse * ivf)
{
GstCaps *caps;
if (!ivf->update_caps &&
G_LIKELY (gst_pad_has_current_caps (GST_BASE_PARSE_SRC_PAD (ivf))))
return;
ivf->update_caps = FALSE;
/* Create src pad caps */
caps = gst_caps_new_simple ("video/x-vp8", "width", G_TYPE_INT, ivf->width,
"height", G_TYPE_INT, ivf->height, NULL);
if (ivf->fps_n > 0 && ivf->fps_d > 0) {
gst_base_parse_set_frame_rate (GST_BASE_PARSE_CAST (ivf),
ivf->fps_n, ivf->fps_d, 0, 0);
gst_caps_set_simple (caps, "framerate", GST_TYPE_FRACTION, ivf->fps_n,
ivf->fps_d, NULL);
}
gst_pad_set_caps (GST_BASE_PARSE_SRC_PAD (ivf), caps);
gst_caps_unref (caps);
}
static GstFlowReturn
gst_ivf_parse_handle_frame_start (GstIvfParse * ivf, GstBaseParseFrame * frame,
gint * skipsize)
@ -175,7 +225,6 @@ gst_ivf_parse_handle_frame_start (GstIvfParse * ivf, GstBaseParseFrame * frame,
GstBuffer *const buffer = frame->buffer;
GstMapInfo map;
GstFlowReturn ret = GST_FLOW_OK;
GstCaps *caps;
gst_buffer_map (buffer, &map, GST_MAP_READ);
if (map.size >= IVF_FILE_HEADER_SIZE) {
@ -199,23 +248,11 @@ gst_ivf_parse_handle_frame_start (GstIvfParse * ivf, GstBaseParseFrame * frame,
goto end;
}
ivf->fps_n = fps_n;
ivf->fps_d = fps_d;
gst_base_parse_set_frame_rate (GST_BASE_PARSE_CAST (ivf),
ivf->fps_n, ivf->fps_d, 0, 0);
/* create src pad caps */
caps = gst_caps_new_simple ("video/x-vp8",
"width", G_TYPE_INT, width, "height", G_TYPE_INT, height,
"framerate", GST_TYPE_FRACTION, ivf->fps_n, ivf->fps_d, NULL);
GST_INFO_OBJECT (ivf, "Found stream: %" GST_PTR_FORMAT, caps);
gst_ivf_parse_set_size (ivf, width, height);
gst_ivf_parse_set_framerate (ivf, fps_n, fps_d);
GST_LOG_OBJECT (ivf, "Stream has %d frames", num_frames);
gst_pad_set_caps (GST_BASE_PARSE_SRC_PAD (ivf), caps);
gst_caps_unref (caps);
/* move along */
ivf->state = GST_IVF_PARSE_DATA;
gst_base_parse_set_min_frame_size (GST_BASE_PARSE_CAST (ivf),
@ -273,12 +310,29 @@ gst_ivf_parse_handle_frame_data (GstIvfParse * ivf, GstBaseParseFrame * frame,
gst_buffer_replace (&frame->out_buffer, out_buffer);
gst_buffer_unref (out_buffer);
/* Detect resolution changes on key frames */
if (gst_buffer_map (frame->out_buffer, &map, GST_MAP_READ)) {
guint32 frame_tag, width, height;
frame_tag = GST_READ_UINT24_LE (map.data);
if (!(frame_tag & 0x01) && map.size >= 10) { /* key frame */
GST_DEBUG_OBJECT (ivf, "key frame detected");
width = GST_READ_UINT16_LE (map.data + 6) & 0x3fff;
height = GST_READ_UINT16_LE (map.data + 8) & 0x3fff;
gst_ivf_parse_set_size (ivf, width, height);
}
gst_buffer_unmap (frame->out_buffer, &map);
}
if (ivf->fps_n > 0) {
GST_BUFFER_TIMESTAMP (out_buffer) =
gst_util_uint64_scale_int (GST_SECOND * frame_pts, ivf->fps_d,
ivf->fps_n);
}
gst_ivf_parse_update_src_caps (ivf);
ret = gst_base_parse_finish_frame (GST_BASE_PARSE_CAST (ivf), frame,
IVF_FRAME_HEADER_SIZE + frame_size);
*skipsize = 0;

3
gst/ivfparse/gstivfparse.h
View file

@ -52,8 +52,11 @@ struct _GstIvfParse
GstIvfParseState state;
guint width;
guint height;
guint fps_n;
guint fps_d;
gboolean update_caps;
};
struct _GstIvfParseClass