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vc1parse: introduce a helper to make sequence-layer
It will be useful to implement stream-format conversion. https://bugzilla.gnome.org/show_bug.cgi?id=738526
This commit is contained in:
Aurélien Zanelli
Sebastian Dröge
parent
eee5110fb4
commit
4cc6c7fe3b
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@ -606,6 +606,99 @@ gst_vc1_parse_get_max_framerate (GstVC1Parse * vc1parse)
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}
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}
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static GstBuffer *
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gst_vc1_parse_make_sequence_layer (GstVC1Parse * vc1parse)
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{
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GstBuffer *seq_layer_buffer;
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guint8 *data;
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guint32 structC = 0;
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GstMapInfo minfo;
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seq_layer_buffer = gst_buffer_new_and_alloc (36);
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gst_buffer_map (seq_layer_buffer, &minfo, GST_MAP_WRITE);
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data = minfo.data;
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/* According to SMPTE 421M Annex L, the sequence layer shall be
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* represented as a sequence of 32 bit unsigned integers and each
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* integers should be serialized in little-endian byte-order except for
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* STRUCT_C which should be serialized in big-endian byte-order. */
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/* Unknown number of frames and start code */
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data[0] = 0xff;
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data[1] = 0xff;
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data[2] = 0xff;
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data[3] = 0xc5;
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/* 0x00000004 */
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GST_WRITE_UINT32_LE (data + 4, 4);
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/* structC */
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structC |= (vc1parse->profile << 30);
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if (vc1parse->profile != GST_VC1_PROFILE_ADVANCED) {
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/* Build simple/main structC from sequence header */
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structC |= (vc1parse->seq_hdr.struct_c.wmvp << 28);
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structC |= (vc1parse->seq_hdr.struct_c.frmrtq_postproc << 25);
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structC |= (vc1parse->seq_hdr.struct_c.bitrtq_postproc << 20);
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structC |= (vc1parse->seq_hdr.struct_c.loop_filter << 19);
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/* Reserved3 shall be set to zero */
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structC |= (vc1parse->seq_hdr.struct_c.multires << 17);
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/* Reserved4 shall be set to one */
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structC |= (1 << 16);
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structC |= (vc1parse->seq_hdr.struct_c.fastuvmc << 15);
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structC |= (vc1parse->seq_hdr.struct_c.extended_mv << 14);
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structC |= (vc1parse->seq_hdr.struct_c.dquant << 12);
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structC |= (vc1parse->seq_hdr.struct_c.vstransform << 11);
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/* Reserved5 shall be set to zero */
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structC |= (vc1parse->seq_hdr.struct_c.overlap << 9);
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structC |= (vc1parse->seq_hdr.struct_c.syncmarker << 8);
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structC |= (vc1parse->seq_hdr.struct_c.rangered << 7);
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structC |= (vc1parse->seq_hdr.struct_c.maxbframes << 4);
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structC |= (vc1parse->seq_hdr.struct_c.quantizer << 2);
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structC |= (vc1parse->seq_hdr.struct_c.finterpflag << 1);
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/* Reserved6 shall be set to one */
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structC |= 1;
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}
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GST_WRITE_UINT32_BE (data + 8, structC);
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/* structA */
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if (vc1parse->profile != GST_VC1_PROFILE_ADVANCED) {
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GST_WRITE_UINT32_LE (data + 12, vc1parse->height);
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GST_WRITE_UINT32_LE (data + 16, vc1parse->width);
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} else {
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GST_WRITE_UINT32_LE (data + 12, 0);
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GST_WRITE_UINT32_LE (data + 16, 0);
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}
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/* 0x0000000c */
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GST_WRITE_UINT32_LE (data + 20, 0x0000000c);
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/* structB */
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/* Unknown HRD_BUFFER */
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GST_WRITE_UINT24_LE (data + 24, 0);
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if ((gint) vc1parse->level != -1)
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data[27] = (vc1parse->level << 5);
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else
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data[27] = (0x4 << 5); /* Use HIGH level */
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/* Unknown HRD_RATE */
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GST_WRITE_UINT32_LE (data + 28, 0);
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/* Framerate */
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if (vc1parse->fps_d == 0) {
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/* If not known, it seems we need to put in the maximum framerate
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possible for the profile/level used (this is for RTP
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(https://tools.ietf.org/html/draft-ietf-avt-rtp-vc1-06#section-6.1),
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so likely elsewhere too */
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GST_WRITE_UINT32_LE (data + 32, gst_vc1_parse_get_max_framerate (vc1parse));
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} else {
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GST_WRITE_UINT32_LE (data + 32,
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((guint32) (((gdouble) vc1parse->fps_n) /
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((gdouble) vc1parse->fps_d) + 0.5)));
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}
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gst_buffer_unmap (seq_layer_buffer, &minfo);
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return seq_layer_buffer;
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}
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static gboolean
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gst_vc1_parse_update_caps (GstVC1Parse * vc1parse)
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{
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@ -795,91 +888,9 @@ gst_vc1_parse_update_caps (GstVC1Parse * vc1parse)
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gst_caps_set_simple (caps, "codec_data", GST_TYPE_BUFFER,
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vc1parse->seq_layer_buffer, NULL);
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} else {
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GstBuffer *codec_data = gst_buffer_new_and_alloc (36);
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guint8 *data;
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guint32 structC = 0;
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GstMapInfo minfo;
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GstBuffer *codec_data;
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gst_buffer_map (codec_data, &minfo, GST_MAP_WRITE);
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data = minfo.data;
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/* According to SMPTE 421M Annex L, the sequence layer shall be
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* represented as a sequence of 32 bit unsigned integers and each
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* integers should be serialized in little-endian byte-order except for
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* STRUCT_C which should be serialized in big-endian byte-order. */
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/* Unknown number of frames and start code */
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data[0] = 0xff;
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data[1] = 0xff;
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data[2] = 0xff;
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data[3] = 0xc5;
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/* 0x00000004 */
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GST_WRITE_UINT32_LE (data + 4, 4);
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/* structC */
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structC |= (vc1parse->profile << 30);
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if (vc1parse->profile != GST_VC1_PROFILE_ADVANCED) {
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/* Build simple/main structC from sequence header */
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structC |= (vc1parse->seq_hdr.struct_c.wmvp << 28);
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structC |= (vc1parse->seq_hdr.struct_c.frmrtq_postproc << 25);
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structC |= (vc1parse->seq_hdr.struct_c.bitrtq_postproc << 20);
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structC |= (vc1parse->seq_hdr.struct_c.loop_filter << 19);
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/* Reserved3 shall be set to zero */
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structC |= (vc1parse->seq_hdr.struct_c.multires << 17);
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/* Reserved4 shall be set to one */
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structC |= (1 << 16);
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structC |= (vc1parse->seq_hdr.struct_c.fastuvmc << 15);
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structC |= (vc1parse->seq_hdr.struct_c.extended_mv << 14);
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structC |= (vc1parse->seq_hdr.struct_c.dquant << 12);
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structC |= (vc1parse->seq_hdr.struct_c.vstransform << 11);
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/* Reserved5 shall be set to zero */
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structC |= (vc1parse->seq_hdr.struct_c.overlap << 9);
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structC |= (vc1parse->seq_hdr.struct_c.syncmarker << 8);
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structC |= (vc1parse->seq_hdr.struct_c.rangered << 7);
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structC |= (vc1parse->seq_hdr.struct_c.maxbframes << 4);
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structC |= (vc1parse->seq_hdr.struct_c.quantizer << 2);
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structC |= (vc1parse->seq_hdr.struct_c.finterpflag << 1);
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/* Reserved6 shall be set to one */
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structC |= 1;
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}
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GST_WRITE_UINT32_BE (data + 8, structC);
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/* structA */
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if (vc1parse->profile != GST_VC1_PROFILE_ADVANCED) {
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GST_WRITE_UINT32_LE (data + 12, vc1parse->height);
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GST_WRITE_UINT32_LE (data + 16, vc1parse->width);
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} else {
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GST_WRITE_UINT32_LE (data + 12, 0);
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GST_WRITE_UINT32_LE (data + 16, 0);
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}
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/* 0x0000000c */
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GST_WRITE_UINT32_LE (data + 20, 0x0000000c);
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/* structB */
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/* Unknown HRD_BUFFER */
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GST_WRITE_UINT24_LE (data + 24, 0);
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if ((gint) vc1parse->level != -1)
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data[27] = (vc1parse->level << 5);
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else
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data[27] = (0x4 << 5); /* Use HIGH level */
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/* Unknown HRD_RATE */
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GST_WRITE_UINT32_LE (data + 28, 0);
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/* Framerate */
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if (vc1parse->fps_d == 0) {
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/* If not known, it seems we need to put in the maximum framerate
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possible for the profile/level used (this is for RTP
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(https://tools.ietf.org/html/draft-ietf-avt-rtp-vc1-06#section-6.1),
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so likely elsewhere too */
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GST_WRITE_UINT32_LE (data + 32,
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gst_vc1_parse_get_max_framerate (vc1parse));
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} else {
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GST_WRITE_UINT32_LE (data + 32,
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((guint32) (((gdouble) vc1parse->fps_n) /
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((gdouble) vc1parse->fps_d) + 0.5)));
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}
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gst_buffer_unmap (codec_data, &minfo);
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codec_data = gst_vc1_parse_make_sequence_layer (vc1parse);
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gst_caps_set_simple (caps, "codec_data", GST_TYPE_BUFFER, codec_data,
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NULL);
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