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mpeg2dec: refactor cropping code to use libgstvideo functions
https://bugzilla.gnome.org/show_bug.cgi?id=571146
This commit is contained in:
Tim-Philipp Müller
parent
fd68911826
commit
40a470c785
1 changed files with 56 additions and 149 deletions
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@ -121,7 +121,7 @@ static const GstEventMask *gst_mpeg2dec_get_event_masks (GstPad * pad);
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static GstElementClass *parent_class = NULL;
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static gboolean crop_buffer (GstMpeg2dec * mpeg2dec, GstBuffer ** buf);
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static gboolean gst_mpeg2dec_crop_buffer (GstMpeg2dec * dec, GstBuffer ** buf);
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/*static guint gst_mpeg2dec_signals[LAST_SIGNAL] = { 0 };*/
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@ -319,137 +319,57 @@ gst_mpeg2dec_get_index (GstElement * element)
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}
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#endif
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/* see gst-plugins/gst/games/gstvideoimage.c, paint_setup_I420() */
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#define I420_Y_ROWSTRIDE(width) (GST_ROUND_UP_4(width))
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#define I420_U_ROWSTRIDE(width) (GST_ROUND_UP_8(width)/2)
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#define I420_V_ROWSTRIDE(width) ((GST_ROUND_UP_8(I420_Y_ROWSTRIDE(width)))/2)
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#define I420_Y_OFFSET(w,h) (0)
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#define I420_U_OFFSET(w,h) (I420_Y_OFFSET(w,h)+(I420_Y_ROWSTRIDE(w)*GST_ROUND_UP_2(h)))
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#define I420_V_OFFSET(w,h) (I420_U_OFFSET(w,h)+(I420_U_ROWSTRIDE(w)*GST_ROUND_UP_2(h)/2))
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#define I420_SIZE(w,h) (I420_V_OFFSET(w,h)+(I420_V_ROWSTRIDE(w)*GST_ROUND_UP_2(h)/2))
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static GstBuffer *
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crop_copy_i420_buffer (GstMpeg2dec * mpeg2dec, GstBuffer * input)
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static gboolean
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gst_mpeg2dec_crop_buffer (GstMpeg2dec * dec, GstBuffer ** buf)
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{
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GstBuffer *inbuf = *buf;
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GstBuffer *outbuf;
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guint8 *dest, *src;
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guint outsize, line;
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guint outsize, c;
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outsize = gst_video_format_get_size (dec->format, dec->width, dec->height);
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GST_LOG_OBJECT (dec, "Copying input buffer %ux%u (%u) to output buffer "
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"%ux%u (%u)", dec->decoded_width, dec->decoded_height,
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GST_BUFFER_SIZE (inbuf), dec->width, dec->height, outsize);
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outsize = I420_SIZE (mpeg2dec->width, mpeg2dec->height);
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GST_LOG_OBJECT (mpeg2dec, "Copying input buffer %ux%u (%u) to output buffer "
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"%ux%u (%u)", mpeg2dec->decoded_width, mpeg2dec->decoded_height,
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GST_BUFFER_SIZE (input), mpeg2dec->width, mpeg2dec->height, outsize);
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outbuf = gst_buffer_new_and_alloc (outsize);
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/* Copy Y first */
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src = GST_BUFFER_DATA (input);
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dest = GST_BUFFER_DATA (outbuf);
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for (line = 0; line < mpeg2dec->height; line++) {
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memcpy (dest, src, mpeg2dec->width);
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dest += I420_Y_ROWSTRIDE (mpeg2dec->width);
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src += I420_Y_ROWSTRIDE (mpeg2dec->decoded_width);
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for (c = 0; c < 3; c++) {
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const guint8 *src;
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guint8 *dest;
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guint stride_in, stride_out;
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guint c_height, c_width, line;
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src =
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GST_BUFFER_DATA (inbuf) +
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gst_video_format_get_component_offset (dec->format, c,
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dec->decoded_width, dec->decoded_height);
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dest =
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GST_BUFFER_DATA (outbuf) +
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gst_video_format_get_component_offset (dec->format, c, dec->width,
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dec->height);
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stride_out = gst_video_format_get_row_stride (dec->format, c, dec->width);
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stride_in =
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gst_video_format_get_row_stride (dec->format, c, dec->decoded_width);
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c_height =
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gst_video_format_get_component_width (dec->format, c, dec->height);
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c_width = gst_video_format_get_component_width (dec->format, c, dec->width);
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for (line = 0; line < c_height; line++) {
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memcpy (dest, src, c_width);
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dest += stride_out;
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src += stride_in;
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}
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}
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/* U */
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src = GST_BUFFER_DATA (input)
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+ I420_U_OFFSET (mpeg2dec->decoded_width, mpeg2dec->decoded_height);
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dest = GST_BUFFER_DATA (outbuf)
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+ I420_U_OFFSET (mpeg2dec->width, mpeg2dec->height);
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for (line = 0; line < mpeg2dec->height / 2; line++) {
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memcpy (dest, src, mpeg2dec->width / 2);
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dest += I420_U_ROWSTRIDE (mpeg2dec->width);
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src += I420_U_ROWSTRIDE (mpeg2dec->decoded_width);
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}
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/* V */
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src = GST_BUFFER_DATA (input)
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+ I420_V_OFFSET (mpeg2dec->decoded_width, mpeg2dec->decoded_height);
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dest = GST_BUFFER_DATA (outbuf)
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+ I420_V_OFFSET (mpeg2dec->width, mpeg2dec->height);
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for (line = 0; line < mpeg2dec->height / 2; line++) {
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memcpy (dest, src, mpeg2dec->width / 2);
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dest += I420_V_ROWSTRIDE (mpeg2dec->width);
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src += I420_V_ROWSTRIDE (mpeg2dec->decoded_width);
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}
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return outbuf;
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}
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/* FIXME: this is unlikely to be right stride-wise and offset-wise */
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static GstBuffer *
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crop_copy_i422_buffer (GstMpeg2dec * mpeg2dec, GstBuffer * input)
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{
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GstBuffer *outbuf;
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guint8 *in_data, *out_data;
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guint line;
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outbuf = gst_buffer_new_and_alloc (mpeg2dec->width * mpeg2dec->height * 2);
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/* Copy Y first */
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in_data = GST_BUFFER_DATA (input);
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out_data = GST_BUFFER_DATA (outbuf);
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for (line = 0; line < mpeg2dec->height; line++) {
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memcpy (out_data, in_data, mpeg2dec->width);
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out_data += mpeg2dec->width;
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in_data += mpeg2dec->decoded_width;
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}
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/* Now copy U & V */
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in_data = GST_BUFFER_DATA (input)
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+ mpeg2dec->decoded_width * mpeg2dec->decoded_height;
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for (line = 0; line < mpeg2dec->height; line++) {
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memcpy (out_data, in_data, mpeg2dec->width / 2);
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memcpy (out_data + mpeg2dec->width * mpeg2dec->height / 2,
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in_data + mpeg2dec->decoded_width * mpeg2dec->decoded_height / 2,
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mpeg2dec->width / 2);
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out_data += mpeg2dec->width / 2;
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in_data += mpeg2dec->decoded_width / 2;
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}
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return outbuf;
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}
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static gboolean
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crop_buffer (GstMpeg2dec * mpeg2dec, GstBuffer ** buf)
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{
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gboolean result = TRUE;
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GstBuffer *input = *buf;
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GstBuffer *outbuf;
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/*We crop only if the target region is smaller than the input one */
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if ((mpeg2dec->decoded_width > mpeg2dec->width) ||
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(mpeg2dec->decoded_height > mpeg2dec->height)) {
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/* If we don't know about the format, we just return the original
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* buffer.
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*/
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if (mpeg2dec->format == GST_VIDEO_FORMAT_Y42B ||
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mpeg2dec->format == GST_VIDEO_FORMAT_I420 ||
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mpeg2dec->format == GST_VIDEO_FORMAT_YV12) {
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/*FIXME: I have tried to use gst_buffer_copy_on_write, but it
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* still have some artifact, so I'me allocating new buffer
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* for each frame decoded...
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*/
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if (mpeg2dec->format == GST_VIDEO_FORMAT_Y42B) {
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outbuf = crop_copy_i422_buffer (mpeg2dec, input);
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} else {
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outbuf = crop_copy_i420_buffer (mpeg2dec, input);
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}
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GST_DEBUG ("cropping buffer");
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gst_buffer_set_caps (outbuf, GST_PAD_CAPS (mpeg2dec->srcpad));
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gst_buffer_copy_metadata (outbuf, input,
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gst_buffer_set_caps (outbuf, GST_PAD_CAPS (dec->srcpad));
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gst_buffer_copy_metadata (outbuf, inbuf,
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GST_BUFFER_COPY_TIMESTAMPS | GST_BUFFER_COPY_FLAGS);
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gst_buffer_unref (input);
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gst_buffer_unref (*buf);
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*buf = outbuf;
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result = TRUE;
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}
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}
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return result;
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return TRUE;
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}
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static GstFlowReturn
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@ -550,41 +470,24 @@ gst_mpeg2dec_negotiate_format (GstMpeg2dec * mpeg2dec)
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if (sequence->width != sequence->chroma_width &&
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sequence->height != sequence->chroma_height) {
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fourcc = GST_STR_FOURCC ("I420");
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mpeg2dec->format = GST_VIDEO_FORMAT_I420;
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mpeg2dec->size =
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I420_SIZE (mpeg2dec->decoded_width, mpeg2dec->decoded_height);
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mpeg2dec->u_offs =
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I420_U_OFFSET (mpeg2dec->decoded_width, mpeg2dec->decoded_height);
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mpeg2dec->v_offs =
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I420_V_OFFSET (mpeg2dec->decoded_width, mpeg2dec->decoded_height);
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} else if ((sequence->width == sequence->chroma_width &&
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sequence->height != sequence->chroma_height) ||
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(sequence->width != sequence->chroma_width &&
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sequence->height == sequence->chroma_height)) {
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gint halfsize;
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fourcc = GST_STR_FOURCC ("Y42B");
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mpeg2dec->format = GST_VIDEO_FORMAT_Y42B;
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halfsize = mpeg2dec->decoded_width * mpeg2dec->decoded_height;
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mpeg2dec->size = halfsize * 2;
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mpeg2dec->u_offs = halfsize;
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mpeg2dec->v_offs = halfsize + (halfsize / 2);
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} else {
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gint size;
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size = mpeg2dec->decoded_width * mpeg2dec->decoded_height;
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fourcc = GST_STR_FOURCC ("Y444");
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mpeg2dec->format = GST_VIDEO_FORMAT_Y444;
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mpeg2dec->size = size * 3;
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mpeg2dec->u_offs = size;
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mpeg2dec->v_offs = size * 2;
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}
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fourcc = gst_video_format_to_fourcc (mpeg2dec->format);
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mpeg2dec->size = gst_video_format_get_size (mpeg2dec->format,
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mpeg2dec->decoded_width, mpeg2dec->decoded_height);
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mpeg2dec->u_offs = gst_video_format_get_component_offset (mpeg2dec->format, 1,
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mpeg2dec->decoded_width, mpeg2dec->decoded_height);
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mpeg2dec->v_offs = gst_video_format_get_component_offset (mpeg2dec->format, 2,
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mpeg2dec->decoded_width, mpeg2dec->decoded_height);
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if (mpeg2dec->pixel_width == 0 || mpeg2dec->pixel_height == 0) {
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GValue par = { 0, }
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, dar = {
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@ -1025,8 +928,12 @@ handle_slice (GstMpeg2dec * mpeg2dec, const mpeg2_info_t * info)
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* array of buffers */
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gst_buffer_ref (outbuf);
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/* do cropping if needed */
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crop_buffer (mpeg2dec, &outbuf);
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/* do cropping if the target region is smaller than the input one */
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if (mpeg2dec->decoded_width != mpeg2dec->width ||
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mpeg2dec->decoded_height != mpeg2dec->height) {
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GST_DEBUG_OBJECT (mpeg2dec, "cropping buffer");
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gst_mpeg2dec_crop_buffer (mpeg2dec, &outbuf);
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}
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if (mpeg2dec->segment.rate >= 0.0) {
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/* forward: push right away */
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