static gboolean gst_ac3_parse_frame_header_eac3 (GstAc3Parse * ac3parse, GstBuffer * buf, gint skip, guint * frame_size, guint * rate, guint * chans, guint * blks, guint * sid) { GstBitReader bits = GST_BIT_READER_INIT_FROM_BUFFER (buf); guint16 frmsiz, sample_rate, blocks; guint8 strmtyp, fscod, fscod2, acmod, lfe_on, strmid, numblkscod; GST_LOG_OBJECT (ac3parse, "parsing e-ac3"); gst_bit_reader_skip_unchecked (&bits, skip * 8); gst_bit_reader_skip_unchecked (&bits, 16); strmtyp = gst_bit_reader_get_bits_uint8_unchecked (&bits, 2); /* strmtyp */ if (G_UNLIKELY (strmtyp == 3)) { GST_DEBUG_OBJECT (ac3parse, "bad strmtyp %d", strmtyp); return FALSE; } strmid = gst_bit_reader_get_bits_uint8_unchecked (&bits, 3); /* substreamid */ frmsiz = gst_bit_reader_get_bits_uint16_unchecked (&bits, 11); /* frmsiz */ fscod = gst_bit_reader_get_bits_uint8_unchecked (&bits, 2); /* fscod */ if (fscod == 3) { fscod2 = gst_bit_reader_get_bits_uint8_unchecked (&bits, 2); /* fscod2 */ if (G_UNLIKELY (fscod2 == 3)) { GST_DEBUG_OBJECT (ac3parse, "invalid fscod2"); return FALSE; } sample_rate = fscod_rates[fscod2] / 2; blocks = 6; } else { numblkscod = gst_bit_reader_get_bits_uint8_unchecked (&bits, 2); /* numblkscod */ sample_rate = fscod_rates[fscod]; blocks = numblks[numblkscod]; } acmod = gst_bit_reader_get_bits_uint8_unchecked (&bits, 3); /* acmod */ lfe_on = gst_bit_reader_get_bits_uint8_unchecked (&bits, 1); /* lfeon */ gst_bit_reader_skip_unchecked (&bits, 5); /* bsid */ if (frame_size) *frame_size = (frmsiz + 1) * 2; if (rate) *rate = sample_rate; if (chans) *chans = acmod_chans[acmod] + lfe_on; if (blks) *blks = blocks; if (sid) *sid = (strmtyp & 0x1) << 3 | strmid; return TRUE; }
static gboolean gst_ac3_parse_frame_header (GstAc3Parse * parse, GstBuffer * buf, gint skip, guint * framesize, guint * rate, guint * chans, guint * blocks, guint * sid, gboolean * eac) { GstBitReader bits; guint16 sync; guint8 bsid; GstMapInfo map; gboolean ret = FALSE; gst_buffer_map (buf, &map, GST_MAP_READ); gst_bit_reader_init (&bits, map.data, map.size); GST_MEMDUMP_OBJECT (parse, "AC3 frame sync", map.data, MIN (map.size, 16)); gst_bit_reader_skip_unchecked (&bits, skip * 8); sync = gst_bit_reader_get_bits_uint16_unchecked (&bits, 16); gst_bit_reader_skip_unchecked (&bits, 16 + 8); bsid = gst_bit_reader_peek_bits_uint8_unchecked (&bits, 5); if (G_UNLIKELY (sync != 0x0b77)) goto cleanup; GST_LOG_OBJECT (parse, "bsid = %d", bsid); if (bsid <= 10) { if (eac) *eac = FALSE; ret = gst_ac3_parse_frame_header_ac3 (parse, buf, skip, framesize, rate, chans, blocks, sid); goto cleanup; } else if (bsid <= 16) { if (eac) *eac = TRUE; ret = gst_ac3_parse_frame_header_eac3 (parse, buf, skip, framesize, rate, chans, blocks, sid); goto cleanup; } else { GST_DEBUG_OBJECT (parse, "unexpected bsid %d", bsid); ret = FALSE; goto cleanup; } GST_DEBUG_OBJECT (parse, "unexpected bsid %d", bsid); cleanup: gst_buffer_unmap (buf, &map); return ret; }
static gboolean gst_ac3_parse_frame_header (GstAc3Parse * parse, GstBuffer * buf, gint skip, guint * framesize, guint * rate, guint * chans, guint * blocks, guint * sid, gboolean * eac) { GstBitReader bits = GST_BIT_READER_INIT_FROM_BUFFER (buf); guint16 sync; guint8 bsid; GST_MEMDUMP_OBJECT (parse, "AC3 frame sync", GST_BUFFER_DATA (buf), 16); gst_bit_reader_skip_unchecked (&bits, skip * 8); sync = gst_bit_reader_get_bits_uint16_unchecked (&bits, 16); gst_bit_reader_skip_unchecked (&bits, 16 + 8); bsid = gst_bit_reader_peek_bits_uint8_unchecked (&bits, 5); if (G_UNLIKELY (sync != 0x0b77)) return FALSE; GST_LOG_OBJECT (parse, "bsid = %d", bsid); if (bsid <= 10) { if (eac) *eac = FALSE; return gst_ac3_parse_frame_header_ac3 (parse, buf, skip, framesize, rate, chans, blocks, sid); } else if (bsid <= 16) { if (eac) *eac = TRUE; return gst_ac3_parse_frame_header_eac3 (parse, buf, skip, framesize, rate, chans, blocks, sid); } else { GST_DEBUG_OBJECT (parse, "unexpected bsid %d", bsid); return FALSE; } }
static GstFlowReturn gst_vdp_h264_dec_parse_data (GstBaseVideoDecoder * base_video_decoder, GstBuffer * buf, gboolean at_eos, GstVideoFrame * frame) { GstVdpH264Dec *h264_dec = GST_VDP_H264_DEC (base_video_decoder); GstBitReader reader; GstNalUnit nal_unit; guint8 forbidden_zero_bit; guint8 *data; guint size; gint i; GstFlowReturn ret = GST_FLOW_OK; GST_MEMDUMP ("data", GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf)); gst_bit_reader_init_from_buffer (&reader, buf); if (gst_bit_reader_get_remaining (&reader) < h264_dec->nal_length_size * 8 + 7) goto invalid_packet; /* skip nal_length or sync code */ gst_bit_reader_skip_unchecked (&reader, h264_dec->nal_length_size * 8); forbidden_zero_bit = gst_bit_reader_get_bits_uint8_unchecked (&reader, 1); if (forbidden_zero_bit != 0) { GST_WARNING ("forbidden_zero_bit != 0"); return GST_FLOW_ERROR; } nal_unit.ref_idc = gst_bit_reader_get_bits_uint16_unchecked (&reader, 2); GST_DEBUG ("nal_ref_idc: %u", nal_unit.ref_idc); /* read nal_unit_type */ nal_unit.type = gst_bit_reader_get_bits_uint16_unchecked (&reader, 5); GST_DEBUG ("nal_unit_type: %u", nal_unit.type); if (nal_unit.type == 14 || nal_unit.type == 20) { if (!gst_bit_reader_skip (&reader, 24)) goto invalid_packet; } nal_unit.IdrPicFlag = (nal_unit.type == 5 ? 1 : 0); data = GST_BUFFER_DATA (buf) + gst_bit_reader_get_pos (&reader) / 8; size = gst_bit_reader_get_remaining (&reader) / 8; i = size - 1; while ((gint) size > 0 && data[i] == 0x00) { size--; i--; } if (GST_VIDEO_FRAME_FLAG_IS_SET (frame, GST_H264_FRAME_GOT_PRIMARY)) { if (nal_unit.type == GST_NAL_SPS || nal_unit.type == GST_NAL_PPS || nal_unit.type == GST_NAL_SEI || nal_unit.type == GST_NAL_AU_DELIMITER || (nal_unit.type >= 14 && nal_unit.type <= 18)) ret = gst_base_video_decoder_have_frame (base_video_decoder, FALSE, &frame); } if (nal_unit.type >= GST_NAL_SLICE && nal_unit.type <= GST_NAL_SLICE_IDR) { GstH264Slice slice; if (!gst_h264_parser_parse_slice_header (h264_dec->parser, &slice, data, size, nal_unit)) goto invalid_packet; if (slice.redundant_pic_cnt == 0) { if (GST_VIDEO_FRAME_FLAG_IS_SET (frame, GST_H264_FRAME_GOT_PRIMARY)) { GstH264Slice *p_slice; guint8 pic_order_cnt_type, p_pic_order_cnt_type; gboolean finish_frame = FALSE; p_slice = &(GST_H264_FRAME_CAST (frame)->slice_hdr); pic_order_cnt_type = slice.picture->sequence->pic_order_cnt_type; p_pic_order_cnt_type = p_slice->picture->sequence->pic_order_cnt_type; if (slice.frame_num != p_slice->frame_num) finish_frame = TRUE; else if (slice.picture != p_slice->picture) finish_frame = TRUE; else if (slice.bottom_field_flag != p_slice->bottom_field_flag) finish_frame = TRUE; else if (nal_unit.ref_idc != p_slice->nal_unit.ref_idc && (nal_unit.ref_idc == 0 || p_slice->nal_unit.ref_idc == 0)) finish_frame = TRUE; else if ((pic_order_cnt_type == 0 && p_pic_order_cnt_type == 0) && (slice.pic_order_cnt_lsb != p_slice->pic_order_cnt_lsb || slice.delta_pic_order_cnt_bottom != p_slice->delta_pic_order_cnt_bottom)) finish_frame = TRUE; else if ((p_pic_order_cnt_type == 1 && p_pic_order_cnt_type == 1) && (slice.delta_pic_order_cnt[0] != p_slice->delta_pic_order_cnt[0] || slice.delta_pic_order_cnt[1] != p_slice->delta_pic_order_cnt[1])) finish_frame = TRUE; if (finish_frame) ret = gst_base_video_decoder_have_frame (base_video_decoder, FALSE, &frame); } if (!GST_VIDEO_FRAME_FLAG_IS_SET (frame, GST_H264_FRAME_GOT_PRIMARY)) { if (GST_H264_IS_I_SLICE (slice.type) || GST_H264_IS_SI_SLICE (slice.type)) GST_VIDEO_FRAME_FLAG_SET (frame, GST_VIDEO_FRAME_FLAG_KEYFRAME); GST_H264_FRAME_CAST (frame)->slice_hdr = slice; GST_VIDEO_FRAME_FLAG_SET (frame, GST_H264_FRAME_GOT_PRIMARY); } } gst_h264_frame_add_slice ((GstH264Frame *) frame, buf); } if (nal_unit.type == GST_NAL_SPS) { if (!gst_h264_parser_parse_sequence (h264_dec->parser, data, size)) goto invalid_packet; } if (nal_unit.type == GST_NAL_PPS) { if (!gst_h264_parser_parse_picture (h264_dec->parser, data, size)) goto invalid_packet; } gst_buffer_unref (buf); return ret; invalid_packet: GST_WARNING ("Invalid packet size!"); gst_buffer_unref (buf); return GST_FLOW_OK; }
/** * gst_mpeg4_parse_video_object_layer: * @vol: The #GstMpeg4VideoObjectLayer structure to fill * @vo: The #GstMpeg4VisualObject currently being parsed or %NULL * @data: The data to parse * @size: The size of the @data to parse * * Parses @data containing the video object layer packet, and fills * the @vol structure. * * Returns: a #GstMpeg4ParseResult */ GstMpeg4ParseResult gst_mpeg4_parse_video_object_layer (GstMpeg4VideoObjectLayer * vol, GstMpeg4VisualObject * vo, const guint8 * data, gsize size) { guint8 video_object_layer_start_code; /* Used for enums types */ guint8 tmp; GstBitReader br = GST_BIT_READER_INIT (data, size); g_return_val_if_fail (vol != NULL, GST_MPEG4_PARSER_ERROR); GST_DEBUG ("Parsing video object layer"); READ_UINT8 (&br, video_object_layer_start_code, 8); if (!(video_object_layer_start_code >= GST_MPEG4_VIDEO_LAYER_FIRST && video_object_layer_start_code <= GST_MPEG4_VIDEO_LAYER_LAST)) goto wrong_start_code; /* set default values */ if (vo) { vol->verid = vo->verid; vol->priority = vo->priority; } else { vol->verid = 1; vol->priority = 0; } vol->low_delay = FALSE; vol->chroma_format = 1; vol->vbv_parameters = FALSE; vol->quant_precision = 5; vol->bits_per_pixel = 8; vol->quarter_sample = FALSE; vol->newpred_enable = FALSE; vol->interlaced = 0; vol->width = 0; vol->height = 0; READ_UINT8 (&br, vol->random_accessible_vol, 1); READ_UINT8 (&br, vol->video_object_type_indication, 8); READ_UINT8 (&br, vol->is_object_layer_identifier, 1); if (vol->is_object_layer_identifier) { READ_UINT8 (&br, vol->verid, 4); READ_UINT8 (&br, vol->priority, 3); } READ_UINT8 (&br, tmp, 4); vol->aspect_ratio_info = tmp; if (vol->aspect_ratio_info != GST_MPEG4_EXTENDED_PAR) { mpeg4_util_par_from_info (vol->aspect_ratio_info, &vol->par_width, &vol->par_height); } else { gint v; READ_UINT8 (&br, vol->par_width, 8); v = vol->par_width; CHECK_ALLOWED (v, 1, 255); READ_UINT8 (&br, vol->par_height, 8); v = vol->par_height; CHECK_ALLOWED (v, 1, 255); } GST_DEBUG ("Pixel aspect ratio %d/%d", vol->par_width, vol->par_width); READ_UINT8 (&br, vol->control_parameters, 1); if (vol->control_parameters) { guint8 chroma_format; READ_UINT8 (&br, chroma_format, 2); vol->chroma_format = chroma_format; READ_UINT8 (&br, vol->low_delay, 1); READ_UINT8 (&br, vol->vbv_parameters, 1); if (vol->vbv_parameters) { CHECK_REMAINING (&br, 79); vol->first_half_bitrate = gst_bit_reader_get_bits_uint16_unchecked (&br, 15); MARKER_UNCHECKED (&br); vol->latter_half_bitrate = gst_bit_reader_get_bits_uint16_unchecked (&br, 15); MARKER_UNCHECKED (&br); vol->bit_rate = (vol->first_half_bitrate << 15) | vol->latter_half_bitrate; vol->first_half_vbv_buffer_size = gst_bit_reader_get_bits_uint16_unchecked (&br, 15); MARKER_UNCHECKED (&br); vol->latter_half_vbv_buffer_size = gst_bit_reader_get_bits_uint8_unchecked (&br, 3); vol->vbv_buffer_size = (vol->first_half_vbv_buffer_size << 15) | vol->latter_half_vbv_buffer_size; vol->first_half_vbv_occupancy = gst_bit_reader_get_bits_uint16_unchecked (&br, 11); MARKER_UNCHECKED (&br); vol->latter_half_vbv_occupancy = gst_bit_reader_get_bits_uint16_unchecked (&br, 15); MARKER_UNCHECKED (&br); } } READ_UINT8 (&br, tmp, 2); vol->shape = tmp; if (vol->shape == GST_MPEG4_GRAYSCALE) { /* TODO support grayscale shapes, for now we just pass */ /* Something the standard starts to define... */ GST_WARNING ("Grayscale shaped not supported"); goto failed; } if (vol->shape == GST_MPEG4_GRAYSCALE && vol->verid != 0x01) READ_UINT8 (&br, vol->shape_extension, 4); CHECK_REMAINING (&br, 19); MARKER_UNCHECKED (&br); vol->vop_time_increment_resolution = gst_bit_reader_get_bits_uint16_unchecked (&br, 16); if (vol->vop_time_increment_resolution < 1) { GST_WARNING ("value not in allowed range. value: %d, range %d-%d", vol->vop_time_increment_resolution, 1, G_MAXUINT16); goto failed; } vol->vop_time_increment_bits = g_bit_storage (vol->vop_time_increment_resolution); MARKER_UNCHECKED (&br); vol->fixed_vop_rate = gst_bit_reader_get_bits_uint8_unchecked (&br, 1); if (vol->fixed_vop_rate) READ_UINT16 (&br, vol->fixed_vop_time_increment, vol->vop_time_increment_bits); if (vol->shape != GST_MPEG4_BINARY_ONLY) { if (vol->shape == GST_MPEG4_RECTANGULAR) { CHECK_REMAINING (&br, 29); MARKER_UNCHECKED (&br); vol->width = gst_bit_reader_get_bits_uint16_unchecked (&br, 13); MARKER_UNCHECKED (&br); vol->height = gst_bit_reader_get_bits_uint16_unchecked (&br, 13); MARKER_UNCHECKED (&br); } READ_UINT8 (&br, vol->interlaced, 1); READ_UINT8 (&br, vol->obmc_disable, 1); if (vol->verid == 0x1) READ_UINT8 (&br, tmp, 1); else READ_UINT8 (&br, tmp, 2); vol->sprite_enable = tmp; if (vol->sprite_enable == GST_MPEG4_SPRITE_STATIC || vol->sprite_enable == GST_MPEG4_SPRITE_GMG) { if (vol->sprite_enable == GST_MPEG4_SPRITE_GMG) CHECK_REMAINING (&br, 9); else { CHECK_REMAINING (&br, 65); vol->sprite_width = gst_bit_reader_get_bits_uint16_unchecked (&br, 13); MARKER_UNCHECKED (&br); vol->sprite_height = gst_bit_reader_get_bits_uint16_unchecked (&br, 13); MARKER_UNCHECKED (&br); vol->sprite_left_coordinate = gst_bit_reader_get_bits_uint16_unchecked (&br, 13); MARKER_UNCHECKED (&br); vol->sprite_top_coordinate = gst_bit_reader_get_bits_uint16_unchecked (&br, 13); MARKER_UNCHECKED (&br); } vol->no_of_sprite_warping_points = gst_bit_reader_get_bits_uint8_unchecked (&br, 6); vol->sprite_warping_accuracy = gst_bit_reader_get_bits_uint8_unchecked (&br, 2); vol->sprite_brightness_change = gst_bit_reader_get_bits_uint8_unchecked (&br, 1); if (vol->sprite_enable != GST_MPEG4_SPRITE_GMG) vol->low_latency_sprite_enable = gst_bit_reader_get_bits_uint8_unchecked (&br, 1); } if (vol->verid != 0x1 && vol->shape != GST_MPEG4_RECTANGULAR) READ_UINT8 (&br, vol->sadct_disable, 1); READ_UINT8 (&br, vol->not_8_bit, 1); if (vol->not_8_bit) { READ_UINT8 (&br, vol->quant_precision, 4); CHECK_ALLOWED (vol->quant_precision, 3, 9); READ_UINT8 (&br, vol->bits_per_pixel, 4); CHECK_ALLOWED (vol->bits_per_pixel, 4, 12); } if (vol->shape == GST_MPEG4_GRAYSCALE) { /* We don't actually support it */ READ_UINT8 (&br, vol->no_gray_quant_update, 1); READ_UINT8 (&br, vol->composition_method, 1); READ_UINT8 (&br, vol->linear_composition, 1); } READ_UINT8 (&br, vol->quant_type, 1); if (vol->quant_type) { if (!parse_quant (&br, vol->intra_quant_mat, default_intra_quant_mat, &vol->load_intra_quant_mat)) goto failed; if (!parse_quant (&br, vol->non_intra_quant_mat, default_non_intra_quant_mat, &vol->load_non_intra_quant_mat)) goto failed; if (vol->shape == GST_MPEG4_GRAYSCALE) { /* Something the standard starts to define... */ GST_WARNING ("Grayscale shaped not supported"); goto failed; } } else { memset (&vol->intra_quant_mat, 0, 64); memset (&vol->non_intra_quant_mat, 0, 64); } if (vol->verid != 0x1) READ_UINT8 (&br, vol->quarter_sample, 1); READ_UINT8 (&br, vol->complexity_estimation_disable, 1); if (!vol->complexity_estimation_disable) { guint8 estimation_method; guint8 estimation_disable; /* skip unneeded properties */ READ_UINT8 (&br, estimation_method, 2); if (estimation_method < 2) { READ_UINT8 (&br, estimation_disable, 1); if (!estimation_disable) SKIP (&br, 6); READ_UINT8 (&br, estimation_disable, 1); if (!estimation_disable) SKIP (&br, 4); CHECK_MARKER (&br); READ_UINT8 (&br, estimation_disable, 1); if (!estimation_disable) SKIP (&br, 4); READ_UINT8 (&br, estimation_disable, 1); if (!estimation_disable) SKIP (&br, 6); CHECK_MARKER (&br); if (estimation_method == 1) { READ_UINT8 (&br, estimation_disable, 1); if (!estimation_disable) SKIP (&br, 2); } } } READ_UINT8 (&br, vol->resync_marker_disable, 1); READ_UINT8 (&br, vol->data_partitioned, 1); if (vol->data_partitioned) READ_UINT8 (&br, vol->reversible_vlc, 1); if (vol->verid != 0x01) { READ_UINT8 (&br, vol->newpred_enable, 1); if (vol->newpred_enable) /* requested_upstream_message_type and newpred_segment_type */ SKIP (&br, 3); READ_UINT8 (&br, vol->reduced_resolution_vop_enable, 1); } READ_UINT8 (&br, vol->scalability, 1); if (vol->scalability) { SKIP (&br, 26); /* Few not needed props */ READ_UINT8 (&br, vol->enhancement_type, 1); } /* More unused infos */ } else if (vol->verid != 0x01) { GST_WARNING ("Binary only shapes not fully supported"); goto failed; } /* ... */ return GST_MPEG4_PARSER_OK; failed: GST_WARNING ("failed parsing \"Video Object Layer\""); return GST_MPEG4_PARSER_ERROR; wrong_start_code: GST_WARNING ("got buffer with wrong start code"); goto failed; }
/** * gst_mpeg4_parse_video_object_plane: * @vop: The #GstMpeg4VideoObjectPlane currently being parsed * @sprite_trajectory: A #GstMpeg4SpriteTrajectory to fill or %NULL * @vol: The #GstMpeg4VideoObjectLayer structure to fill * @data: The data to parse * @size: The size of the @data to parse * * Parses @data containing the video object plane packet, and fills the @vol * structure. * * Returns: a #GstMpeg4ParseResult */ GstMpeg4ParseResult gst_mpeg4_parse_video_object_plane (GstMpeg4VideoObjectPlane * vop, GstMpeg4SpriteTrajectory * sprite_trajectory, GstMpeg4VideoObjectLayer * vol, const guint8 * data, gsize size) { guint8 vop_start_code, coding_type, modulo_time_base; GstBitReader br = GST_BIT_READER_INIT (data, size); g_return_val_if_fail (vop != NULL, GST_MPEG4_PARSER_ERROR); if (vol->shape == GST_MPEG4_BINARY_ONLY) { /* TODO: implement binary only shapes */ GST_WARNING ("Binary only shapes not supported"); goto failed; } READ_UINT8 (&br, vop_start_code, 8); if (vop_start_code != GST_MPEG4_VIDEO_OBJ_PLANE) goto wrong_start_code; /* set default values */ vop->modulo_time_base = 0; vop->rounding_type = 0; vop->top_field_first = 1; vop->alternate_vertical_scan_flag = 0; vop->fcode_forward = 1; vop->fcode_backward = 1; /* Compute macroblock informations */ if (vol->interlaced) vop->mb_height = (2 * (vol->height + 31) / 32); else vop->mb_height = (vol->height + 15) / 16; vop->mb_width = (vol->width + 15) / 16; vop->mb_num = vop->mb_height * vop->mb_width; READ_UINT8 (&br, coding_type, 2); vop->coding_type = coding_type; READ_UINT8 (&br, modulo_time_base, 1); while (modulo_time_base) { vop->modulo_time_base++; READ_UINT8 (&br, modulo_time_base, 1); } CHECK_REMAINING (&br, vol->vop_time_increment_bits + 3); MARKER_UNCHECKED (&br); vop->time_increment = gst_bit_reader_get_bits_uint16_unchecked (&br, vol->vop_time_increment_bits); MARKER_UNCHECKED (&br); vop->coded = gst_bit_reader_get_bits_uint8_unchecked (&br, 1); if (!vop->coded) return GST_MPEG4_PARSER_OK; if (vol->newpred_enable) { guint16 nbbits = vop->time_increment + 3 < 15 ? vop->time_increment + 3 : 15; READ_UINT16 (&br, vop->id, nbbits); READ_UINT8 (&br, vop->id_for_prediction_indication, 1); if (vop->id_for_prediction_indication) { /* Would be nice if the standard actually told us... */ READ_UINT16 (&br, vop->id, nbbits); CHECK_MARKER (&br); } } if (vol->shape != GST_MPEG4_BINARY_ONLY && (vop->coding_type == GST_MPEG4_P_VOP || (vop->coding_type == GST_MPEG4_S_VOP && vol->sprite_enable == GST_MPEG4_SPRITE_GMG))) READ_UINT8 (&br, vop->rounding_type, 1); if ((vol->reduced_resolution_vop_enable) && (vol->shape == GST_MPEG4_RECTANGULAR || (vop->coding_type = GST_MPEG4_P_VOP || vop->coding_type == GST_MPEG4_I_VOP))) READ_UINT8 (&br, vop->reduced_resolution, 1); if (vol->shape != GST_MPEG4_RECTANGULAR) { if (vol->sprite_enable == GST_MPEG4_SPRITE_STATIC && vop->coding_type == GST_MPEG4_I_VOP) { CHECK_REMAINING (&br, 55); vop->width = gst_bit_reader_get_bits_uint16_unchecked (&br, 13); MARKER_UNCHECKED (&br); vop->height = gst_bit_reader_get_bits_uint16_unchecked (&br, 13); MARKER_UNCHECKED (&br); vop->horizontal_mc_spatial_ref = gst_bit_reader_get_bits_uint16_unchecked (&br, 13); MARKER_UNCHECKED (&br); vop->vertical_mc_spatial_ref = gst_bit_reader_get_bits_uint16_unchecked (&br, 13); MARKER_UNCHECKED (&br); /* Recompute the Macroblock informations * accordingly to the new values */ if (vol->interlaced) vop->mb_height = (2 * (vol->height + 31) / 32); else vop->mb_height = (vol->height + 15) / 16; vop->mb_width = (vol->width + 15) / 16; vop->mb_num = vop->mb_height * vop->mb_width; } if ((vol->shape != GST_MPEG4_BINARY_ONLY) && vol->scalability && vol->enhancement_type) READ_UINT8 (&br, vop->background_composition, 1); READ_UINT8 (&br, vop->change_conv_ratio_disable, 1); READ_UINT8 (&br, vop->constant_alpha, 1); if (vop->constant_alpha) READ_UINT8 (&br, vop->constant_alpha_value, 1); } if (vol->shape != GST_MPEG4_BINARY_ONLY) { if (!vol->complexity_estimation_disable) { GST_WARNING ("Complexity estimation not supported"); goto failed; } READ_UINT8 (&br, vop->intra_dc_vlc_thr, 3); if (vol->interlaced) { READ_UINT8 (&br, vop->top_field_first, 1); READ_UINT8 (&br, vop->alternate_vertical_scan_flag, 1); } } if ((vol->sprite_enable == GST_MPEG4_SPRITE_STATIC || vol->sprite_enable == GST_MPEG4_SPRITE_GMG) && vop->coding_type == GST_MPEG4_S_VOP) { /* only if @sprite_trajectory is not NULL we parse it */ if (sprite_trajectory && vol->no_of_sprite_warping_points) parse_sprite_trajectory (&br, sprite_trajectory, vol->no_of_sprite_warping_points); if (vol->sprite_brightness_change) { GST_WARNING ("sprite_brightness_change not supported"); goto failed; } if (vol->sprite_enable == GST_MPEG4_SPRITE_STATIC) { GST_WARNING ("sprite enable static not supported"); goto failed; } } if (vol->shape != GST_MPEG4_BINARY_ONLY) { READ_UINT16 (&br, vop->quant, vol->quant_precision); if (vol->shape == GST_MPEG4_GRAYSCALE) { /* TODO implement grayscale support */ GST_WARNING ("Grayscale shapes no supported"); /* TODO implement me */ goto failed; } if (vop->coding_type != GST_MPEG4_I_VOP) { READ_UINT8 (&br, vop->fcode_forward, 3); CHECK_ALLOWED (vop->fcode_forward, 1, 7); } if (vop->coding_type == GST_MPEG4_B_VOP) { READ_UINT8 (&br, vop->fcode_backward, 3); CHECK_ALLOWED (vop->fcode_backward, 1, 7); } } if (!vol->scalability) { if (vol->shape != GST_MPEG4_RECTANGULAR) READ_UINT8 (&br, vop->shape_coding_type, 1); } else { if (vol->enhancement_type) { READ_UINT8 (&br, vop->load_backward_shape, 1); if (vop->load_backward_shape) { GST_WARNING ("Load backward shape not supported"); goto failed; } READ_UINT8 (&br, vop->ref_select_code, 2); } } vop->size = gst_bit_reader_get_pos (&br); /* More things to possibly parse ... */ return GST_MPEG4_PARSER_OK; failed: GST_WARNING ("failed parsing \"Video Object Plane\""); return GST_MPEG4_PARSER_ERROR; wrong_start_code: GST_WARNING ("got buffer with wrong start code"); goto failed; }