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video: Add GstVideoFrame helper structure
The videoframe structure can be used to easily parse the contents of video buffers.
This commit is contained in:
Wim Taymans
parent
6a254de438
commit
42abb6672e
2 changed files with 113 additions and 23 deletions
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@ -26,6 +26,7 @@
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#include <string.h>
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#include "video.h"
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#include "gstmetavideo.h"
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static int get_size (GstVideoFormat format, int width, int height);
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static int get_stride (GstVideoFormat format, int plane, int width);
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@ -862,12 +863,96 @@ gst_video_info_to_caps (GstVideoInfo * info)
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gst_caps_set_simple (caps, "color-matrix", G_TYPE_STRING,
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info->color_matrix, NULL);
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if (info->chroma_site)
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gst_caps_set_simple (caps, "chromar-site", G_TYPE_STRING, info->chroma_site,
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gst_caps_set_simple (caps, "chroma-site", G_TYPE_STRING, info->chroma_site,
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NULL);
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return caps;
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}
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/**
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* gst_video_frame_map:
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* @frame: pointer to #GstVideoFrame
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* @info: a #GstVideoInfo
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* @buffer: the buffer to map
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*
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* Use @info and @buffer to fill in the values of @frame.
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*
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* All video planes of @buffer will be mapped and the pointers will be set in
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* @frame->data.
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*
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* Returns: %TRUE on success.
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*/
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gboolean
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gst_video_frame_map (GstVideoFrame * frame, GstVideoInfo * info,
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GstBuffer * buffer, GstMapFlags flags)
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{
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GstMetaVideo *meta;
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gint i;
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guint8 *data;
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gsize size;
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g_return_val_if_fail (frame != NULL, FALSE);
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g_return_val_if_fail (info != NULL, FALSE);
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g_return_val_if_fail (GST_IS_BUFFER (buffer), FALSE);
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frame->buffer = buffer;
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meta = gst_buffer_get_meta_video (buffer);
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frame->meta = meta;
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if (meta) {
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/* FIXME use metadata */
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} else {
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/* copy the info */
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frame->info = *info;
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data = gst_buffer_map (buffer, &size, NULL, flags);
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/* do some sanity checks */
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if (size < info->size)
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goto invalid_size;
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/* set up pointers */
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for (i = 0; i < info->n_planes; i++) {
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frame->data[i] = data + info->plane[i].offset;
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}
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}
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return TRUE;
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/* ERRORS */
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invalid_size:
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{
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gst_buffer_unmap (buffer, data, size);
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return FALSE;
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}
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}
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/**
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* gst_video_frame_unmap:
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* @frame: a #GstVideoFrame
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*
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* Unmap the memory previously mapped with gst_video_frame_map.
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*/
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void
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gst_video_frame_unmap (GstVideoFrame * frame)
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{
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GstBuffer *buffer;
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GstMetaVideo *meta;
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guint8 *data;
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g_return_if_fail (frame != NULL);
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buffer = frame->buffer;
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meta = frame->meta;
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if (meta) {
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/* FIXME use metadata */
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} else {
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data = frame->data[0];
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data -= frame->info.plane[0].offset;
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gst_buffer_unmap (buffer, data, -1);
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}
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}
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/**
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* get_stride:
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* @format: a #GstVideoFormat
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@ -977,7 +1062,6 @@ get_stride (GstVideoFormat format, int plane, int width)
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}
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}
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#if 0
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/**
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* gst_video_format_get_component_width:
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* @format: a #GstVideoFormat
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@ -992,7 +1076,7 @@ get_stride (GstVideoFormat format, int plane, int width)
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*
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* Returns: width of component @component
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*/
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static int
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int
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gst_video_format_get_component_width (GstVideoFormat format,
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int component, int width)
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{
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@ -1063,9 +1147,7 @@ gst_video_format_get_component_width (GstVideoFormat format,
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return 0;
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}
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}
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#endif
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#if 0
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/**
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* gst_video_format_get_component_height:
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* @format: a #GstVideoFormat
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@ -1151,11 +1233,9 @@ gst_video_format_get_component_height (GstVideoFormat format,
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return 0;
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}
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}
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#endif
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#if 0
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/**
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* get_component_offset:
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* gst_video_format_get_component_offset:
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* @format: a #GstVideoFormat
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* @component: the component index
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* @width: the width of video
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@ -1172,8 +1252,8 @@ gst_video_format_get_component_height (GstVideoFormat format,
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*
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* Returns: offset of component @component
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*/
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static int
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get_component_offset (GstVideoFormat format,
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int
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gst_video_format_get_component_offset (GstVideoFormat format,
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int component, int width, int height)
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{
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g_return_val_if_fail (format != GST_VIDEO_FORMAT_UNKNOWN, 0);
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@ -1420,7 +1500,6 @@ get_component_offset (GstVideoFormat format,
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GST_WARNING ("unhandled format %d or component %d", format, component);
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return 0;
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}
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#endif
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/**
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* get_plane_offset:
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@ -1551,9 +1630,9 @@ fill_planes (GstVideoInfo * info)
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(GST_ROUND_UP_4 (height) / 4);
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break;
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default:
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GST_WARNING ("unhandled format %d", info->format);
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break;
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}
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GST_WARNING ("unhandled format %d", info->format);
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return 0;
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}
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@ -145,6 +145,7 @@ int gst_video_format_get_pixel_stride (GstVideoFormat format,
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typedef struct _GstVideoPlane GstVideoPlane;
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typedef struct _GstVideoInfo GstVideoInfo;
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typedef struct _GstVideoFrame GstVideoFrame;
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/**
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* GstVideoFlags:
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@ -228,6 +229,22 @@ struct _GstVideoInfo {
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GstVideoPlane plane[GST_VIDEO_MAX_PLANES];
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};
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/**
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* GstVideoFrame:
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* @info: the #GstVideoInfo
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* @buffer: the mapped buffer
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* @data: pointers to the plane data
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*
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* A video frame obtained from gst_video_frame_map()
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*/
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struct _GstVideoFrame {
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GstVideoInfo info;
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GstBuffer *buffer;
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gpointer meta;
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guint8 *data[GST_VIDEO_MAX_PLANES];
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};
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void gst_video_info_init (GstVideoInfo *info);
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@ -244,6 +261,10 @@ gboolean gst_video_info_convert (GstVideoInfo *info,
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GstFormat dest_format,
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gint64 *dest_value);
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gboolean gst_video_frame_map (GstVideoFrame *frame, GstVideoInfo *info,
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GstBuffer *buffer, GstMapFlags flags);
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void gst_video_frame_unmap (GstVideoFrame *frame);
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#define GST_VIDEO_SIZE_RANGE "(int) [ 1, max ]"
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#define GST_VIDEO_FPS_RANGE "(fraction) [ 0, max ]"
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@ -323,7 +344,6 @@ gboolean gst_video_calculate_display_ratio (guint * dar_n,
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gboolean gst_video_parse_caps_framerate (GstCaps * caps, int *fps_n, int *fps_d);
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GstBuffer * gst_video_parse_caps_palette (GstCaps * caps);
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#if 0
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int gst_video_format_get_component_width (GstVideoFormat format,
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int component,
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int width) G_GNUC_CONST;
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@ -331,19 +351,10 @@ int gst_video_format_get_component_width (GstVideoFormat format,
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int gst_video_format_get_component_height (GstVideoFormat format,
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int component,
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int height) G_GNUC_CONST;
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int gst_video_format_get_component_offset (GstVideoFormat format,
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int component,
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int width,
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int height) G_GNUC_CONST;
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int gst_video_format_get_size (GstVideoFormat format,
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int width,
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int height) G_GNUC_CONST;
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gboolean gst_video_get_size_from_caps (const GstCaps * caps, gint * size);
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#endif
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int height);
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/* video still frame event creation and parsing */
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