/* Gstreamer * Copyright (C) <2011> Intel * Copyright (C) <2011> Collabora Ltd. * Copyright (C) <2011> Thibault Saunier * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301, USA. */ /** * SECTION:gstmpeg4parser * @short_description: Convenience library for parsing mpeg4 part 2 video * bitstream. * * For more details about the structures, you can refer to the * specifications: ISO-IEC-14496-2_2004_MPEG4_VISUAL.pdf */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include "gstmpeg4parser.h" #include "parserutils.h" #ifndef GST_DISABLE_GST_DEBUG #define GST_CAT_DEFAULT ensure_debug_category() static GstDebugCategory * ensure_debug_category (void) { static gsize cat_gonce = 0; if (g_once_init_enter (&cat_gonce)) { gsize cat_done; cat_done = (gsize) _gst_debug_category_new ("codecparsers_mpeg4", 0, "GstMpeg4 codec parsing library"); g_once_init_leave (&cat_gonce, cat_done); } return (GstDebugCategory *) cat_gonce; } #else #define ensure_debug_category() /* NOOP */ #endif /* GST_DISABLE_GST_DEBUG */ #define CHECK_MARKER(br) G_STMT_START { \ guint8 marker;\ if (!gst_bit_reader_get_bits_uint8 (br, &marker, 1)) { \ GST_WARNING ("failed to read marker bit"); \ goto failed; \ } else if (!marker) {\ GST_WARNING ("Wrong marker bit"); \ goto failed;\ }\ } G_STMT_END #define MARKER_UNCHECKED(br) G_STMT_START { \ if (!gst_bit_reader_get_bits_uint8_unchecked (br, 1)) { \ GST_WARNING ("Wrong marker bit"); \ goto failed; \ } \ } G_STMT_END #define CHECK_REMAINING(br, needed) G_STMT_START { \ if (gst_bit_reader_get_remaining (br) < needed) \ goto failed; \ } G_STMT_END static const guint8 default_intra_quant_mat[64] = { 8, 17, 18, 19, 21, 23, 25, 27, 17, 18, 19, 21, 23, 25, 27, 28, 20, 21, 22, 23, 24, 26, 28, 30, 21, 22, 23, 24, 26, 28, 30, 32, 22, 23, 24, 26, 28, 30, 32, 35, 23, 24, 26, 28, 30, 32, 35, 38, 25, 26, 28, 30, 32, 35, 38, 41, 27, 28, 30, 32, 35, 38, 41, 45 }; static const guint8 default_non_intra_quant_mat[64] = { 16, 17, 18, 19, 20, 21, 22, 23, 17, 18, 19, 20, 21, 22, 23, 24, 18, 19, 20, 21, 22, 23, 24, 25, 19, 20, 21, 22, 23, 24, 26, 27, 20, 21, 22, 23, 25, 26, 27, 28, 21, 22, 23, 24, 26, 27, 28, 30, 22, 23, 24, 26, 27, 28, 30, 31, 23, 24, 25, 27, 28, 30, 31, 33, }; static const guint8 mpeg4_zigzag_8x8[64] = { 0, 1, 8, 16, 9, 2, 3, 10, 17, 24, 32, 25, 18, 11, 4, 5, 12, 19, 26, 33, 40, 48, 41, 34, 27, 20, 13, 6, 7, 14, 21, 28, 35, 42, 49, 56, 57, 50, 43, 36, 29, 22, 15, 23, 30, 37, 44, 51, 58, 59, 52, 45, 38, 31, 39, 46, 53, 60, 61, 54, 47, 55, 62, 63 }; static const VLCTable mpeg4_dmv_size_vlc_table[] = { {0x00, 2, 0}, {0x02, 3, 1}, {0x03, 3, 2}, {0x04, 3, 3}, {0x05, 3, 4}, {0x06, 3, 5}, {0x0e, 4, 6}, {0x1e, 5, 7}, {0x3e, 6, 8}, {0x7e, 7, 9}, {0xfe, 8, 10}, {0x1fe, 9, 11}, {0x3fe, 10, 12}, {0x7fe, 11, 13}, {0xffe, 12, 14} }; static void mpeg4_util_par_from_info (guint8 aspect_ratio_info, guint8 * par_width, guint8 * par_height) { switch (aspect_ratio_info) { case 0x02: *par_width = 12; *par_height = 11; break; case 0x03: *par_width = 10; *par_height = 11; break; case 0x04: *par_width = 16; *par_height = 11; break; case 0x05: *par_width = 40; *par_height = 33; break; case 0x01: default: *par_width = 1; *par_height = 1; } } static gboolean parse_quant (GstBitReader * br, guint8 quant_mat[64], const guint8 default_quant_mat[64], guint8 * load_quant_mat) { READ_UINT8 (br, *load_quant_mat, 1); if (*load_quant_mat) { guint i; guint8 val; val = 1; for (i = 0; i < 64; i++) { if (val != 0) READ_UINT8 (br, val, 8); if (val == 0) { if (i == 0) goto invalid_quant_mat; quant_mat[mpeg4_zigzag_8x8[i]] = quant_mat[mpeg4_zigzag_8x8[i - 1]]; } else quant_mat[mpeg4_zigzag_8x8[i]] = val; } } else memcpy (quant_mat, default_quant_mat, 64); return TRUE; failed: GST_WARNING ("failed parsing quant matrix"); return FALSE; invalid_quant_mat: GST_WARNING ("the first value should be non zero"); goto failed; } static gboolean parse_signal_type (GstBitReader * br, GstMpeg4VideoSignalType * signal_type) { READ_UINT8 (br, signal_type->type, 1); if (signal_type->type) { READ_UINT8 (br, signal_type->format, 3); READ_UINT8 (br, signal_type->range, 1); READ_UINT8 (br, signal_type->color_description, 1); if (signal_type->color_description) { READ_UINT8 (br, signal_type->color_primaries, 8); READ_UINT8 (br, signal_type->transfer_characteristics, 8); READ_UINT8 (br, signal_type->matrix_coefficients, 8); } } return TRUE; failed: GST_WARNING ("failed parsing \"Video Signal Type\""); return FALSE; } static gboolean parse_sprite_trajectory (GstBitReader * br, GstMpeg4SpriteTrajectory * sprite_traj, guint no_of_sprite_warping_points) { guint i, length; for (i = 0; i < no_of_sprite_warping_points; i++) { if (!decode_vlc (br, &length, mpeg4_dmv_size_vlc_table, G_N_ELEMENTS (mpeg4_dmv_size_vlc_table))) goto failed; if (length) READ_UINT16 (br, sprite_traj->vop_ref_points[i], length); CHECK_MARKER (br); if (!decode_vlc (br, &length, mpeg4_dmv_size_vlc_table, G_N_ELEMENTS (mpeg4_dmv_size_vlc_table))) goto failed; if (length) READ_UINT16 (br, sprite_traj->sprite_ref_points[i], length); CHECK_MARKER (br); } return TRUE; failed: GST_WARNING ("Could not parse the sprite trajectory"); return FALSE; } static guint find_psc (GstByteReader * br) { guint psc_pos = -1, psc; if (!gst_byte_reader_peek_uint24_be (br, &psc)) goto failed; /* Scan for the picture start code (22 bits - 0x0020) */ while ((gst_byte_reader_get_remaining (br) >= 3)) { if (gst_byte_reader_peek_uint24_be (br, &psc) && ((psc & 0xfffffc) == 0x000080)) { psc_pos = gst_byte_reader_get_pos (br); break; } else gst_byte_reader_skip_unchecked (br, 1); } failed: return psc_pos; } static inline guint8 compute_resync_marker_size (const GstMpeg4VideoObjectPlane * vop, guint32 * pattern, guint32 * mask) { guint8 off; /* FIXME handle the binary only shape case */ switch (vop->coding_type) { case (GST_MPEG4_I_VOP): off = 16; break; case (GST_MPEG4_S_VOP): case (GST_MPEG4_P_VOP): off = 15 + vop->fcode_forward; break; case (GST_MPEG4_B_VOP): off = MAX (15 + MAX (vop->fcode_forward, vop->fcode_backward), 17); break; default: return -1; } if (mask && pattern) { switch (off) { case 16: *pattern = 0x00008000; *mask = 0xffff8000; break; case 17: *pattern = 0x00004000; *mask = 0xffffc000; break; case 18: *pattern = 0x00002000; *mask = 0xffffe000; break; case 19: *pattern = 0x00001000; *mask = 0xfffff000; break; case 20: *pattern = 0x00000800; *mask = 0xfffff800; break; case 21: *pattern = 0x00000400; *mask = 0xfffffc00; break; case 22: *pattern = 0x00000200; *mask = 0xfffffe00; break; case 23: *pattern = 0x00000100; *mask = 0xffffff00; break; } } return off++; /* Take the following 1 into account */ } /** * gst_mpeg4_next_resync: * @packet: The #GstMpeg4Packet to fill * @vop: The previously parsed #GstMpeg4VideoObjectPlane * @offset: offset from which to start the parsing * @data: The data to parse * @size: The size of the @data to parse * * Parses @data and fills @packet with the information of the next resync packet * found. * * Returns: a #GstMpeg4ParseResult */ static GstMpeg4ParseResult gst_mpeg4_next_resync (GstMpeg4Packet * packet, const GstMpeg4VideoObjectPlane * vop, const guint8 * data, gsize size, gboolean first_resync_marker) { guint markersize = 0, off1, off2; guint32 mask = 0xff, pattern = 0xff; GstByteReader br; gst_byte_reader_init (&br, data, size); g_return_val_if_fail (packet != NULL, GST_MPEG4_PARSER_ERROR); g_return_val_if_fail (vop != NULL, GST_MPEG4_PARSER_ERROR); markersize = compute_resync_marker_size (vop, &pattern, &mask); if (first_resync_marker) { off1 = 0; } else { off1 = gst_byte_reader_masked_scan_uint32 (&br, mask, pattern, 0, size); } if (off1 == -1) return GST_MPEG4_PARSER_NO_PACKET; GST_DEBUG ("Resync code found at %i", off1); packet->offset = off1; packet->type = GST_MPEG4_RESYNC; packet->marker_size = markersize; off2 = gst_byte_reader_masked_scan_uint32 (&br, mask, pattern, off1 + 2, size - off1 - 2); if (off2 == -1) return GST_MPEG4_PARSER_NO_PACKET_END; packet->size = off2 - off1; return GST_MPEG4_PARSER_OK; } /********** API **********/ /** * gst_mpeg4_parse: * @packet: The #GstMpeg4Packet to fill * @skip_user_data: %TRUE to skip user data packet %FALSE otherwize * @vop: The last parsed #GstMpeg4VideoObjectPlane or %NULL if you do * not need to detect the resync codes. * @offset: offset from which to start the parsing * @data: The data to parse * @size: The size of the @data to parse * * Parses @data and fills @packet with the information of the next packet * found. * * Returns: a #GstMpeg4ParseResult */ GstMpeg4ParseResult gst_mpeg4_parse (GstMpeg4Packet * packet, gboolean skip_user_data, GstMpeg4VideoObjectPlane * vop, const guint8 * data, guint offset, gsize size) { gint off1, off2; GstByteReader br; GstMpeg4ParseResult resync_res; static guint first_resync_marker = TRUE; gst_byte_reader_init (&br, data, size); g_return_val_if_fail (packet != NULL, GST_MPEG4_PARSER_ERROR); if (size - offset <= 4) { GST_DEBUG ("Can't parse, buffer is to small size %" G_GSIZE_FORMAT " at offset %d", size, offset); return GST_MPEG4_PARSER_ERROR; } if (vop) { resync_res = gst_mpeg4_next_resync (packet, vop, data + offset, size - offset, first_resync_marker); first_resync_marker = FALSE; /* We found a complet slice */ if (resync_res == GST_MPEG4_PARSER_OK) return resync_res; else if (resync_res == GST_MPEG4_PARSER_NO_PACKET_END) { /* It doesn't mean there is no standard packet end, look for it */ off1 = packet->offset; goto find_end; } else if (resync_res == GST_MPEG4_PARSER_NO_PACKET) return resync_res; } else { first_resync_marker = TRUE; } off1 = gst_byte_reader_masked_scan_uint32 (&br, 0xffffff00, 0x00000100, offset, size - offset); if (off1 == -1) { GST_DEBUG ("No start code prefix in this buffer"); return GST_MPEG4_PARSER_NO_PACKET; } /* Recursively skip user data if needed */ if (skip_user_data && data[off1 + 3] == GST_MPEG4_USER_DATA) /* If we are here, we know no resync code has been found the first time, so we * don't look for it this time */ return gst_mpeg4_parse (packet, skip_user_data, NULL, data, off1 + 3, size); packet->offset = off1 + 3; packet->data = data; packet->type = (GstMpeg4StartCode) (data[off1 + 3]); find_end: off2 = gst_byte_reader_masked_scan_uint32 (&br, 0xffffff00, 0x00000100, off1 + 4, size - off1 - 4); if (off2 == -1) { GST_DEBUG ("Packet start %d, No end found", off1 + 4); packet->size = G_MAXUINT; return GST_MPEG4_PARSER_NO_PACKET_END; } if (packet->type == GST_MPEG4_RESYNC) { packet->size = (gsize) off2 - off1; } else { packet->size = (gsize) off2 - off1 - 3; } GST_DEBUG ("Complete packet of type %x found at: %d, Size: %" G_GSIZE_FORMAT, packet->type, packet->offset, packet->size); return GST_MPEG4_PARSER_OK; } /** * gst_h263_parse: * @packet: The #GstMpeg4Packet to fill * @offset: offset from which to start the parsing * @data: The data to parse * @size: The size of the @data to parse * * Parses @data and fills @packet with the information of the next packet * found. * * Note that the type of the packet is meaningless in this case. * * Returns: a #GstMpeg4ParseResult */ GstMpeg4ParseResult gst_h263_parse (GstMpeg4Packet * packet, const guint8 * data, guint offset, gsize size) { gint off1, off2; GstByteReader br; gst_byte_reader_init (&br, data + offset, size - offset); g_return_val_if_fail (packet != NULL, GST_MPEG4_PARSER_ERROR); if (size - offset < 3) { GST_DEBUG ("Can't parse, buffer is to small size %" G_GSIZE_FORMAT " at offset %d", size, offset); return GST_MPEG4_PARSER_ERROR; } off1 = find_psc (&br); if (off1 == -1) { GST_DEBUG ("No start code prefix in this buffer"); return GST_MPEG4_PARSER_NO_PACKET; } packet->offset = off1 + offset; packet->data = data; gst_byte_reader_skip_unchecked (&br, 3); off2 = find_psc (&br); if (off2 == -1) { GST_DEBUG ("Packet start %d, No end found", off1); packet->size = G_MAXUINT; return GST_MPEG4_PARSER_NO_PACKET_END; } packet->size = (gsize) off2 - off1; GST_DEBUG ("Complete packet found at: %d, Size: %" G_GSIZE_FORMAT, packet->offset, packet->size); return GST_MPEG4_PARSER_OK; } /** * gst_mpeg4_parse_visual_object_sequence: * @vos: The #GstMpeg4VisualObjectSequence structure to fill * @data: The data to parse, should contain the visual_object_sequence_start_code * but not the start code prefix * @size: The size of the @data to parse * * Parses @data containing the visual object sequence packet, and fills * the @vos structure. * * Returns: a #GstMpeg4ParseResult */ GstMpeg4ParseResult gst_mpeg4_parse_visual_object_sequence (GstMpeg4VisualObjectSequence * vos, const guint8 * data, gsize size) { guint8 vos_start_code; GstBitReader br = GST_BIT_READER_INIT (data, size); g_return_val_if_fail (vos != NULL, GST_MPEG4_PARSER_ERROR); READ_UINT8 (&br, vos_start_code, 8); if (vos_start_code != GST_MPEG4_VISUAL_OBJ_SEQ_START) goto wrong_start_code; READ_UINT8 (&br, vos->profile_and_level_indication, 8); switch (vos->profile_and_level_indication) { case 0x01: vos->profile = GST_MPEG4_PROFILE_SIMPLE; vos->level = GST_MPEG4_LEVEL1; break; case 0x02: vos->profile = GST_MPEG4_PROFILE_SIMPLE; vos->level = GST_MPEG4_LEVEL2; break; case 0x03: vos->profile = GST_MPEG4_PROFILE_SIMPLE; vos->level = GST_MPEG4_LEVEL3; break; case 0x08: vos->profile = GST_MPEG4_PROFILE_SIMPLE; vos->level = GST_MPEG4_LEVEL0; break; case 0x10: vos->profile = GST_MPEG4_PROFILE_SIMPLE_SCALABLE; vos->level = GST_MPEG4_LEVEL0; break; case 0x11: vos->profile = GST_MPEG4_PROFILE_SIMPLE_SCALABLE; vos->level = GST_MPEG4_LEVEL1; break; case 0x12: vos->profile = GST_MPEG4_PROFILE_SIMPLE_SCALABLE; vos->level = GST_MPEG4_LEVEL2; break; case 0x21: vos->profile = GST_MPEG4_PROFILE_CORE; vos->level = GST_MPEG4_LEVEL1; break; case 0x22: vos->profile = GST_MPEG4_PROFILE_CORE; vos->level = GST_MPEG4_LEVEL2; break; case 0x32: vos->profile = GST_MPEG4_PROFILE_MAIN; vos->level = GST_MPEG4_LEVEL2; break; case 0x33: vos->profile = GST_MPEG4_PROFILE_MAIN; vos->level = GST_MPEG4_LEVEL3; break; case 0x34: vos->profile = GST_MPEG4_PROFILE_MAIN; vos->level = GST_MPEG4_LEVEL4; break; case 0x42: vos->profile = GST_MPEG4_PROFILE_N_BIT; vos->level = GST_MPEG4_LEVEL2; break; case 0x51: vos->profile = GST_MPEG4_PROFILE_SCALABLE_TEXTURE; vos->level = GST_MPEG4_LEVEL1; break; case 0x61: vos->profile = GST_MPEG4_PROFILE_SIMPLE_FACE_ANIMATION; vos->level = GST_MPEG4_LEVEL1; break; case 0x62: vos->profile = GST_MPEG4_PROFILE_SIMPLE_FACE_ANIMATION; vos->level = GST_MPEG4_LEVEL2; break; case 0x63: vos->profile = GST_MPEG4_PROFILE_SIMPLE_FBA; vos->level = GST_MPEG4_LEVEL1; break; case 0x64: vos->profile = GST_MPEG4_PROFILE_SIMPLE_FBA; vos->level = GST_MPEG4_LEVEL2; break; case 0x71: vos->profile = GST_MPEG4_PROFILE_BASIC_ANIMATED_TEXTURE; vos->level = GST_MPEG4_LEVEL1; break; case 0x72: vos->profile = GST_MPEG4_PROFILE_BASIC_ANIMATED_TEXTURE; vos->level = GST_MPEG4_LEVEL2; break; case 0x81: vos->profile = GST_MPEG4_PROFILE_HYBRID; vos->level = GST_MPEG4_LEVEL1; break; case 0x82: vos->profile = GST_MPEG4_PROFILE_HYBRID; vos->level = GST_MPEG4_LEVEL2; break; case 0x91: vos->profile = GST_MPEG4_PROFILE_ADVANCED_REALTIME_SIMPLE; vos->level = GST_MPEG4_LEVEL1; break; case 0x92: vos->profile = GST_MPEG4_PROFILE_ADVANCED_REALTIME_SIMPLE; vos->level = GST_MPEG4_LEVEL2; break; case 0x93: vos->profile = GST_MPEG4_PROFILE_ADVANCED_REALTIME_SIMPLE; vos->level = GST_MPEG4_LEVEL3; break; case 0x94: vos->profile = GST_MPEG4_PROFILE_ADVANCED_REALTIME_SIMPLE; vos->level = GST_MPEG4_LEVEL4; break; case 0xa1: vos->profile = GST_MPEG4_PROFILE_CORE_SCALABLE; vos->level = GST_MPEG4_LEVEL1; break; case 0xa2: vos->profile = GST_MPEG4_PROFILE_CORE_SCALABLE; vos->level = GST_MPEG4_LEVEL2; break; case 0xa3: vos->profile = GST_MPEG4_PROFILE_CORE_SCALABLE; vos->level = GST_MPEG4_LEVEL3; break; case 0xb1: vos->profile = GST_MPEG4_PROFILE_ADVANCED_CODING_EFFICIENCY; vos->level = GST_MPEG4_LEVEL1; break; case 0xb2: vos->profile = GST_MPEG4_PROFILE_ADVANCED_CODING_EFFICIENCY; vos->level = GST_MPEG4_LEVEL2; break; case 0xb3: vos->profile = GST_MPEG4_PROFILE_ADVANCED_CODING_EFFICIENCY; vos->level = GST_MPEG4_LEVEL3; break; case 0xb4: vos->profile = GST_MPEG4_PROFILE_ADVANCED_CODING_EFFICIENCY; vos->level = GST_MPEG4_LEVEL4; break; case 0xc1: vos->profile = GST_MPEG4_PROFILE_ADVANCED_CORE; vos->level = GST_MPEG4_LEVEL1; break; case 0xc2: vos->profile = GST_MPEG4_PROFILE_ADVANCED_CORE; vos->level = GST_MPEG4_LEVEL2; break; case 0xc3: vos->profile = GST_MPEG4_PROFILE_ADVANCED_CORE; vos->level = GST_MPEG4_LEVEL3; break; case 0xd1: vos->profile = GST_MPEG4_PROFILE_ADVANCED_SCALABLE_TEXTURE; vos->level = GST_MPEG4_LEVEL1; break; case 0xd2: vos->profile = GST_MPEG4_PROFILE_ADVANCED_SCALABLE_TEXTURE; vos->level = GST_MPEG4_LEVEL2; break; case 0xd3: vos->profile = GST_MPEG4_PROFILE_ADVANCED_SCALABLE_TEXTURE; vos->level = GST_MPEG4_LEVEL3; break; case 0xe1: vos->profile = GST_MPEG4_PROFILE_SIMPLE_STUDIO; vos->level = GST_MPEG4_LEVEL1; break; case 0xe2: vos->profile = GST_MPEG4_PROFILE_SIMPLE_STUDIO; vos->level = GST_MPEG4_LEVEL2; break; case 0xe3: vos->profile = GST_MPEG4_PROFILE_SIMPLE_STUDIO; vos->level = GST_MPEG4_LEVEL3; break; case 0xe4: vos->profile = GST_MPEG4_PROFILE_SIMPLE_STUDIO; vos->level = GST_MPEG4_LEVEL4; break; case 0xe5: vos->profile = GST_MPEG4_PROFILE_CORE_STUDIO; vos->level = GST_MPEG4_LEVEL1; break; case 0xe6: vos->profile = GST_MPEG4_PROFILE_CORE_STUDIO; vos->level = GST_MPEG4_LEVEL2; break; case 0xe7: vos->profile = GST_MPEG4_PROFILE_CORE_STUDIO; vos->level = GST_MPEG4_LEVEL3; break; case 0xe8: vos->profile = GST_MPEG4_PROFILE_CORE_STUDIO; vos->level = GST_MPEG4_LEVEL4; break; case 0xf0: vos->profile = GST_MPEG4_PROFILE_ADVANCED_SIMPLE; vos->level = GST_MPEG4_LEVEL0; break; case 0xf1: vos->profile = GST_MPEG4_PROFILE_ADVANCED_SIMPLE; vos->level = GST_MPEG4_LEVEL1; break; case 0xf2: vos->profile = GST_MPEG4_PROFILE_ADVANCED_SIMPLE; vos->level = GST_MPEG4_LEVEL2; break; case 0xf3: vos->profile = GST_MPEG4_PROFILE_ADVANCED_SIMPLE; vos->level = GST_MPEG4_LEVEL3; break; case 0xf4: vos->profile = GST_MPEG4_PROFILE_ADVANCED_SIMPLE; vos->level = GST_MPEG4_LEVEL4; break; case 0xf5: vos->profile = GST_MPEG4_PROFILE_ADVANCED_SIMPLE; vos->level = GST_MPEG4_LEVEL5; break; case 0xf7: vos->profile = GST_MPEG4_PROFILE_ADVANCED_SIMPLE; vos->level = GST_MPEG4_LEVEL3b; break; case 0xf8: vos->profile = GST_MPEG4_PROFILE_FINE_GRANULARITY_SCALABLE; vos->level = GST_MPEG4_LEVEL0; break; case 0xf9: vos->profile = GST_MPEG4_PROFILE_FINE_GRANULARITY_SCALABLE; vos->level = GST_MPEG4_LEVEL1; break; case 0xfa: vos->profile = GST_MPEG4_PROFILE_FINE_GRANULARITY_SCALABLE; vos->level = GST_MPEG4_LEVEL2; break; case 0xfb: vos->profile = GST_MPEG4_PROFILE_FINE_GRANULARITY_SCALABLE; vos->level = GST_MPEG4_LEVEL3; break; case 0xfc: vos->profile = GST_MPEG4_PROFILE_FINE_GRANULARITY_SCALABLE; vos->level = GST_MPEG4_LEVEL4; break; case 0xfd: vos->profile = GST_MPEG4_PROFILE_FINE_GRANULARITY_SCALABLE; vos->level = GST_MPEG4_LEVEL5; break; default: vos->profile = GST_MPEG4_PROFILE_RESERVED; vos->level = GST_MPEG4_LEVEL_RESERVED; break; } return GST_MPEG4_PARSER_OK; wrong_start_code: GST_WARNING ("got buffer with wrong start code"); return GST_MPEG4_PARSER_ERROR; failed: GST_WARNING ("failed parsing \"Visual Object\""); return GST_MPEG4_PARSER_ERROR; } /** * gst_mpeg4_parse_visual_object: * @vo: The #GstMpeg4VisualObject structure to fill * @signal_type: The #GstMpeg4VideoSignalType to fill or %NULL * @data: The data to parse, should contain the vo_start_code * but not the start code prefix * @size: The size of the @data to parse * * Parses @data containing the visual object packet, and fills * the @vo structure. * * Returns: a #GstMpeg4ParseResult */ GstMpeg4ParseResult gst_mpeg4_parse_visual_object (GstMpeg4VisualObject * vo, GstMpeg4VideoSignalType * signal_type, const guint8 * data, gsize size) { guint8 vo_start_code, type; GstBitReader br = GST_BIT_READER_INIT (data, size); g_return_val_if_fail (vo != NULL, GST_MPEG4_PARSER_ERROR); GST_DEBUG ("Parsing visual object"); READ_UINT8 (&br, vo_start_code, 8); if (vo_start_code != GST_MPEG4_VISUAL_OBJ) goto wrong_start_code; /* set default values */ vo->verid = 0x1; vo->priority = 1; READ_UINT8 (&br, vo->is_identifier, 1); if (vo->is_identifier) { READ_UINT8 (&br, vo->verid, 4); READ_UINT8 (&br, vo->priority, 3); } READ_UINT8 (&br, type, 4); vo->type = type; if ((type == GST_MPEG4_VIDEO_ID || type == GST_MPEG4_STILL_TEXTURE_ID) && signal_type) { if (!parse_signal_type (&br, signal_type)) goto failed; } else if (signal_type) { signal_type->type = 0; } return GST_MPEG4_PARSER_OK; wrong_start_code: GST_WARNING ("got buffer with wrong start code"); return GST_MPEG4_PARSER_ERROR; failed: GST_WARNING ("failed parsing \"Visual Object\""); return GST_MPEG4_PARSER_ERROR; } /** * 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_group_of_vop: * @gov: The #GstMpeg4GroupOfVOP structure to fill * @data: The data to parse * @size: The size of the @data to parse * * Parses @data containing the group of video object plane packet, and fills * the @gov structure. * * Returns: a #GstMpeg4ParseResult */ GstMpeg4ParseResult gst_mpeg4_parse_group_of_vop (GstMpeg4GroupOfVOP * gov, const guint8 * data, gsize size) { guint8 gov_start_code; GstBitReader br = GST_BIT_READER_INIT (data, size); g_return_val_if_fail (gov != NULL, GST_MPEG4_PARSER_ERROR); READ_UINT8 (&br, gov_start_code, 8); if (gov_start_code != GST_MPEG4_GROUP_OF_VOP) goto wrong_start_code; CHECK_REMAINING (&br, 65); gov->hours = gst_bit_reader_get_bits_uint8_unchecked (&br, 5); gov->minutes = gst_bit_reader_get_bits_uint8_unchecked (&br, 6); /* marker bit */ MARKER_UNCHECKED (&br); gov->seconds = gst_bit_reader_get_bits_uint8_unchecked (&br, 6); gov->closed = gst_bit_reader_get_bits_uint8_unchecked (&br, 1); gov->broken_link = gst_bit_reader_get_bits_uint8_unchecked (&br, 1); return GST_MPEG4_PARSER_OK; failed: GST_WARNING ("failed parsing \"Group of Video Object Plane\""); 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; } /** * gst_mpeg4_parse_video_plane_with_short_header: * @shorthdr: The #GstMpeg4VideoPlaneShortHdr to parse * @data: The data to parse * @size: The size of the @data to parse */ GstMpeg4ParseResult gst_mpeg4_parse_video_plane_short_header (GstMpeg4VideoPlaneShortHdr * shorthdr, const guint8 * data, gsize size) { guint8 zero_bits; GstBitReader br = GST_BIT_READER_INIT (data, size); g_return_val_if_fail (shorthdr != NULL, GST_MPEG4_PARSER_ERROR); if (gst_bit_reader_get_remaining (&br) < 48) goto failed; if (gst_bit_reader_get_bits_uint32_unchecked (&br, 22) != 0x20) goto failed; shorthdr->temporal_reference = gst_bit_reader_get_bits_uint8_unchecked (&br, 8); CHECK_MARKER (&br); zero_bits = gst_bit_reader_get_bits_uint8_unchecked (&br, 1); if (zero_bits != 0x00) goto failed; shorthdr->split_screen_indicator = gst_bit_reader_get_bits_uint8_unchecked (&br, 1); shorthdr->document_camera_indicator = gst_bit_reader_get_bits_uint8_unchecked (&br, 1); shorthdr->full_picture_freeze_release = gst_bit_reader_get_bits_uint8_unchecked (&br, 1); shorthdr->source_format = gst_bit_reader_get_bits_uint8_unchecked (&br, 3); /* Set parameters/Table 6-25 */ switch (shorthdr->source_format) { case 0x01: shorthdr->vop_width = 128; shorthdr->vop_height = 96; shorthdr->num_macroblocks_in_gob = 8; shorthdr->num_gobs_in_vop = 6; break; case 0x02: shorthdr->vop_width = 176; shorthdr->vop_height = 144; shorthdr->num_macroblocks_in_gob = 11; shorthdr->num_gobs_in_vop = 9; break; case 0x03: shorthdr->vop_width = 352; shorthdr->vop_height = 288; shorthdr->num_macroblocks_in_gob = 22; shorthdr->num_gobs_in_vop = 18; break; case 0x04: shorthdr->vop_width = 704; shorthdr->vop_height = 576; shorthdr->num_macroblocks_in_gob = 88; shorthdr->num_gobs_in_vop = 18; break; case 0x05: shorthdr->vop_width = 1408; shorthdr->vop_height = 1152; shorthdr->num_macroblocks_in_gob = 352; shorthdr->num_gobs_in_vop = 18; break; default: shorthdr->vop_width = 0; shorthdr->vop_height = 0; shorthdr->num_macroblocks_in_gob = 0; shorthdr->num_gobs_in_vop = 0; } shorthdr->picture_coding_type = gst_bit_reader_get_bits_uint8_unchecked (&br, 1); zero_bits = gst_bit_reader_get_bits_uint8_unchecked (&br, 4); if (zero_bits != 0x00) goto failed; shorthdr->vop_quant = gst_bit_reader_get_bits_uint8_unchecked (&br, 5); zero_bits = gst_bit_reader_get_bits_uint8_unchecked (&br, 1); if (zero_bits != 0x00) goto failed; do { READ_UINT8 (&br, shorthdr->pei, 1); if (shorthdr->pei == 1) READ_UINT8 (&br, shorthdr->psupp, 8); } while (shorthdr->pei == 1); shorthdr->size = gst_bit_reader_get_pos (&br); return GST_MPEG4_PARSER_OK; failed: GST_WARNING ("Could not parse the Plane short header"); return GST_MPEG4_PARSER_ERROR; } /** * gst_mpeg4_parse_video_packet_header: * @videopackethdr: The #GstMpeg4VideoPacketHdr structure to fill * @vol: The last parsed #GstMpeg4VideoObjectLayer, will be updated * with the informations found during the parsing * @vop: The last parsed #GstMpeg4VideoObjectPlane, will be updated * with the informations found during the parsing * @sprite_trajectory: A #GstMpeg4SpriteTrajectory to fill or %NULL * with the informations found during the parsing * @data: The data to parse, should be set after the resync marker. * @size: The size of the data to parse * * Parsers @data containing the video packet header * and fills the @videopackethdr structure */ GstMpeg4ParseResult gst_mpeg4_parse_video_packet_header (GstMpeg4VideoPacketHdr * videopackethdr, GstMpeg4VideoObjectLayer * vol, GstMpeg4VideoObjectPlane * vop, GstMpeg4SpriteTrajectory * sprite_trajectory, const guint8 * data, gsize size) { guint8 markersize; GstBitReader br = GST_BIT_READER_INIT (data, size); g_return_val_if_fail (videopackethdr != NULL, GST_MPEG4_PARSER_ERROR); g_return_val_if_fail (vol != NULL, GST_MPEG4_PARSER_ERROR); markersize = compute_resync_marker_size (vop, NULL, NULL); CHECK_REMAINING (&br, markersize); if (gst_bit_reader_get_bits_uint32_unchecked (&br, markersize + 1) != 0x01) goto failed; if (vol->shape != GST_MPEG4_RECTANGULAR) { READ_UINT8 (&br, videopackethdr->header_extension_code, 1); if (vol->sprite_enable == GST_MPEG4_SPRITE_STATIC && vop->coding_type == GST_MPEG4_I_VOP) { CHECK_REMAINING (&br, 56); U_READ_UINT16 (&br, vop->width, 13); CHECK_MARKER (&br); U_READ_UINT16 (&br, vop->height, 13); CHECK_MARKER (&br); U_READ_UINT16 (&br, vop->horizontal_mc_spatial_ref, 13); CHECK_MARKER (&br); U_READ_UINT16 (&br, vop->vertical_mc_spatial_ref, 13); CHECK_MARKER (&br); /* Update macroblock infirmations */ vop->mb_height = (vop->height + 15) / 16; vop->mb_width = (vop->width + 15) / 16; vop->mb_num = vop->mb_height * vop->mb_width; } } READ_UINT16 (&br, videopackethdr->macroblock_number, g_bit_storage (vop->mb_num - 1)); if (vol->shape != GST_MPEG4_BINARY_ONLY) READ_UINT16 (&br, videopackethdr->quant_scale, vol->quant_precision); if (vol->shape == GST_MPEG4_RECTANGULAR) READ_UINT8 (&br, videopackethdr->header_extension_code, 1); if (videopackethdr->header_extension_code) { guint timeincr = 0; guint8 bit = 0, coding_type; do { READ_UINT8 (&br, bit, 1); timeincr++; } while (bit); vol->vop_time_increment_bits = timeincr; CHECK_MARKER (&br); READ_UINT16 (&br, vop->time_increment, timeincr); CHECK_MARKER (&br); READ_UINT8 (&br, coding_type, 2); vop->coding_type = coding_type; if (vol->shape != GST_MPEG4_RECTANGULAR) { READ_UINT8 (&br, vop->change_conv_ratio_disable, 1); if (vop->coding_type != GST_MPEG4_I_VOP) READ_UINT8 (&br, vop->shape_coding_type, 1); } if (vol->shape != GST_MPEG4_BINARY_ONLY) { READ_UINT8 (&br, vop->intra_dc_vlc_thr, 3); if (sprite_trajectory && vol->sprite_enable == GST_MPEG4_SPRITE_GMG && vop->coding_type == GST_MPEG4_S_VOP && vol->no_of_sprite_warping_points > 0) { parse_sprite_trajectory (&br, sprite_trajectory, vol->no_of_sprite_warping_points); } 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 (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->newpred_enable) { guint16 nbbits = vol->vop_time_increment_bits + 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); } } videopackethdr->size = gst_bit_reader_get_pos (&br); failed: GST_DEBUG ("Failed to parse video packet header"); return GST_MPEG4_PARSER_NO_PACKET; }