/* * header.c * Copyright (C) 2000-2003 Michel Lespinasse * Copyright (C) 2003 Regis Duchesne * Copyright (C) 1999-2000 Aaron Holtzman * * This file is part of mpeg2dec, a free MPEG-2 video stream decoder. * See http://libmpeg2.sourceforge.net/ for updates. * * mpeg2dec is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * mpeg2dec 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * libmpeg2 sync history: * 2008-07-01 - CVS revision 1.101 */ #include "plugin.h" #include "mpeg2dec_config.h" #include "mpeg2.h" #include "attributes.h" #include "mpeg2_internal.h" #define SEQ_EXT 2 #define SEQ_DISPLAY_EXT 4 #define QUANT_MATRIX_EXT 8 #define COPYRIGHT_EXT 0x10 #define PIC_DISPLAY_EXT 0x80 #define PIC_CODING_EXT 0x100 /* default intra quant matrix, in zig-zag order */ static const uint8_t default_intra_quantizer_matrix[64] = { 8, 16, 16, 19, 16, 19, 22, 22, 22, 22, 22, 22, 26, 24, 26, 27, 27, 27, 26, 26, 26, 26, 27, 27, 27, 29, 29, 29, 34, 34, 34, 29, 29, 29, 27, 27, 29, 29, 32, 32, 34, 34, 37, 38, 37, 35, 35, 34, 35, 38, 38, 40, 40, 40, 48, 48, 46, 46, 56, 56, 58, 69, 69, 83 }; const uint8_t default_mpeg2_scan_norm[64] = { /* Zig-Zag scan pattern */ 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 }; const uint8_t default_mpeg2_scan_alt[64] = { /* Alternate scan pattern */ 0, 8, 16, 24, 1, 9, 2, 10, 17, 25, 32, 40, 48, 56, 57, 49, 41, 33, 26, 18, 3, 11, 4, 12, 19, 27, 34, 42, 50, 58, 35, 43, 51, 59, 20, 28, 5, 13, 6, 14, 21, 29, 36, 44, 52, 60, 37, 45, 53, 61, 22, 30, 7, 15, 23, 31, 38, 46, 54, 62, 39, 47, 55, 63 }; uint8_t mpeg2_scan_norm[64] IDATA_ATTR; uint8_t mpeg2_scan_alt[64] IDATA_ATTR; void mpeg2_header_state_init (mpeg2dec_t * mpeg2dec) { if (mpeg2dec->sequence.width != (unsigned)-1) { mpeg2dec->sequence.width = (unsigned)-1; mpeg2_mem_reset(); /* Clean the memory slate */ #if 0 if (!mpeg2dec->custom_fbuf) { int i; for (i = mpeg2dec->alloc_index_user; i < mpeg2dec->alloc_index; i++) { mpeg2_free(mpeg2dec->fbuf_alloc[i].fbuf.buf[0]); #if MPEG2_COLOR mpeg2_free(mpeg2dec->fbuf_alloc[i].fbuf.buf[1]); mpeg2_free(mpeg2dec->fbuf_alloc[i].fbuf.buf[2]); #endif } } if (mpeg2dec->convert_start) { int i; for (i = 0; i < 3; i++) { mpeg2_free(mpeg2dec->yuv_buf[i][0]); #if MPEG2_COLOR mpeg2_free(mpeg2dec->yuv_buf[i][1]); mpeg2_free(mpeg2dec->yuv_buf[i][2]); #endif } } if (mpeg2dec->decoder.convert_id) { mpeg2_free(mpeg2dec->decoder.convert_id); } #endif } mpeg2dec->decoder.coding_type = I_TYPE; mpeg2dec->decoder.convert = NULL; mpeg2dec->decoder.convert_id = NULL; mpeg2dec->picture = mpeg2dec->pictures; mpeg2dec->fbuf[0] = &mpeg2dec->fbuf_alloc[0].fbuf; mpeg2dec->fbuf[1] = &mpeg2dec->fbuf_alloc[1].fbuf; mpeg2dec->fbuf[2] = &mpeg2dec->fbuf_alloc[2].fbuf; mpeg2dec->first = 1; mpeg2dec->alloc_index = 0; mpeg2dec->alloc_index_user = 0; mpeg2dec->first_decode_slice = 1; mpeg2dec->nb_decode_slices = 0xb0 - 1; mpeg2dec->convert = NULL; mpeg2dec->convert_start = NULL; mpeg2dec->custom_fbuf = 0; mpeg2dec->yuv_index = 0; } void mpeg2_reset_info (mpeg2_info_t * info) { info->current_picture = info->current_picture_2nd = NULL; info->display_picture = info->display_picture_2nd = NULL; info->current_fbuf = info->display_fbuf = info->discard_fbuf = NULL; } static void info_user_data (mpeg2dec_t * mpeg2dec) { if (mpeg2dec->user_data_len) { mpeg2dec->info.user_data = mpeg2dec->chunk_buffer; mpeg2dec->info.user_data_len = mpeg2dec->user_data_len - 3; } } int mpeg2_header_sequence (mpeg2dec_t * mpeg2dec) { static const unsigned int frame_period[16] = { 0, 1126125, 1125000, 1080000, 900900, 900000, 540000, 450450, 450000, /* unofficial: xing 15 fps */ 1800000, /* unofficial: libmpeg3 "Unofficial economy rates" 5/10/12/15 fps */ 5400000, 2700000, 2250000, 1800000, 0, 0 }; uint8_t * buffer = mpeg2dec->chunk_start; mpeg2_sequence_t * sequence = &mpeg2dec->new_sequence; int i; if ((buffer[6] & 0x20) != 0x20) /* missing marker_bit */ return 1; i = (buffer[0] << 16) | (buffer[1] << 8) | buffer[2]; if (!(sequence->display_width = sequence->picture_width = i >> 12)) return 1; if (!(sequence->display_height = sequence->picture_height = i & 0xfff)) return 1; sequence->width = (sequence->picture_width + 15) & ~15; sequence->height = (sequence->picture_height + 15) & ~15; sequence->chroma_width = sequence->width >> 1; sequence->chroma_height = sequence->height >> 1; sequence->flags = SEQ_FLAG_PROGRESSIVE_SEQUENCE | SEQ_VIDEO_FORMAT_UNSPECIFIED; sequence->pixel_width = buffer[3] >> 4; /* aspect ratio */ sequence->frame_period = frame_period[buffer[3] & 15]; sequence->byte_rate = (buffer[4]<<10) | (buffer[5]<<2) | (buffer[6]>>6); sequence->vbv_buffer_size = ((buffer[6]<<16) | (buffer[7]<<8)) & 0x1ff800; if (buffer[7] & 4) sequence->flags |= SEQ_FLAG_CONSTRAINED_PARAMETERS; mpeg2dec->copy_matrix = 3; if (buffer[7] & 2) { for (i = 0; i < 64; i++) { mpeg2dec->new_quantizer_matrix[0][mpeg2_scan_norm[i]] = (buffer[i+7] << 7) | (buffer[i+8] >> 1); } buffer += 64; } else { for (i = 0; i < 64; i++) { mpeg2dec->new_quantizer_matrix[0][mpeg2_scan_norm[i]] = default_intra_quantizer_matrix[i]; } } if (buffer[7] & 1) { for (i = 0; i < 64; i++) { mpeg2dec->new_quantizer_matrix[1][mpeg2_scan_norm[i]] = buffer[i+8]; } } else { rb->memset (mpeg2dec->new_quantizer_matrix[1], 16, 64); } sequence->profile_level_id = 0x80; sequence->colour_primaries = 0; sequence->transfer_characteristics = 0; sequence->matrix_coefficients = 0; mpeg2dec->ext_state = SEQ_EXT; mpeg2dec->state = STATE_SEQUENCE; mpeg2dec->display_offset_x = mpeg2dec->display_offset_y = 0; return 0; } static int sequence_ext (mpeg2dec_t * mpeg2dec) { uint8_t * buffer = mpeg2dec->chunk_start; mpeg2_sequence_t * sequence = &mpeg2dec->new_sequence; uint32_t flags; if (!(buffer[3] & 1)) return 1; sequence->profile_level_id = (buffer[0] << 4) | (buffer[1] >> 4); sequence->picture_width += ((buffer[1] << 13) | (buffer[2] << 5)) & 0x3000; sequence->display_width = sequence->picture_width; sequence->picture_height += (buffer[2] << 7) & 0x3000; sequence->display_height = sequence->picture_height; sequence->width = (sequence->picture_width + 15) & ~15; sequence->height = (sequence->picture_height + 15) & ~15; flags = sequence->flags | SEQ_FLAG_MPEG2; if (!(buffer[1] & 8)) { flags &= ~SEQ_FLAG_PROGRESSIVE_SEQUENCE; sequence->height = (sequence->height + 31) & ~31; } if (buffer[5] & 0x80) flags |= SEQ_FLAG_LOW_DELAY; sequence->flags = flags; sequence->chroma_width = sequence->width; sequence->chroma_height = sequence->height; switch (buffer[1] & 6) { case 0: /* invalid */ return 1; case 2: /* 4:2:0 */ sequence->chroma_height >>= 1; /* fallthrough */ case 4: /* 4:2:2 */ sequence->chroma_width >>= 1; } sequence->byte_rate += ((buffer[2]<<25) | (buffer[3]<<17)) & 0x3ffc0000; sequence->vbv_buffer_size |= buffer[4] << 21; sequence->frame_period = sequence->frame_period * ((buffer[5]&31)+1) / (((buffer[5]>>2)&3)+1); mpeg2dec->ext_state = SEQ_DISPLAY_EXT; return 0; } static int sequence_display_ext (mpeg2dec_t * mpeg2dec) { uint8_t * buffer = mpeg2dec->chunk_start; mpeg2_sequence_t * sequence = &mpeg2dec->new_sequence; int x; sequence->flags = (sequence->flags & ~SEQ_MASK_VIDEO_FORMAT) | ((buffer[0] << 4) & SEQ_MASK_VIDEO_FORMAT); if (buffer[0] & 1) { sequence->flags |= SEQ_FLAG_COLOUR_DESCRIPTION; sequence->colour_primaries = buffer[1]; sequence->transfer_characteristics = buffer[2]; sequence->matrix_coefficients = buffer[3]; buffer += 3; } if (!(buffer[2] & 2)) /* missing marker_bit */ return 1; x = (buffer[1] << 6) | (buffer[2] >> 2); if (x) sequence->display_width = x; x = ((buffer[2] & 1) << 13) | (buffer[3] << 5) | (buffer[4] >> 3); if (x) sequence->display_height = x; return 0; } static inline void simplify (unsigned int * u, unsigned int * v) { unsigned int a, b, tmp; a = *u; b = *v; /* find greatest common divisor */ while (a) { tmp = a; a = b % tmp; b = tmp; } *u /= b; *v /= b; } static inline void finalize_sequence (mpeg2_sequence_t * sequence) { int width; int height; sequence->byte_rate *= 50; if (sequence->flags & SEQ_FLAG_MPEG2) { switch (sequence->pixel_width) { case 1: /* square pixels */ sequence->pixel_width = sequence->pixel_height = 1; return; case 2: /* 4:3 aspect ratio */ width = 4; height = 3; break; case 3: /* 16:9 aspect ratio */ width = 16; height = 9; break; case 4: /* 2.21:1 aspect ratio */ width = 221; height = 100; break; default: /* illegal */ sequence->pixel_width = sequence->pixel_height = 0; return; } width *= sequence->display_height; height *= sequence->display_width; } else { if (sequence->byte_rate == 50 * 0x3ffff) sequence->byte_rate = 0; /* mpeg-1 VBR */ switch (sequence->pixel_width) { case 0: case 15: /* illegal */ sequence->pixel_width = sequence->pixel_height = 0; return; case 1: /* square pixels */ sequence->pixel_width = sequence->pixel_height = 1; return; case 3: /* 720x576 16:9 */ sequence->pixel_width = 64; sequence->pixel_height = 45; return; case 6: /* 720x480 16:9 */ sequence->pixel_width = 32; sequence->pixel_height = 27; return; case 8: /* BT.601 625 lines 4:3 */ sequence->pixel_width = 59; sequence->pixel_height = 54; return; case 12: /* BT.601 525 lines 4:3 */ sequence->pixel_width = 10; sequence->pixel_height = 11; return; default: height = 88 * sequence->pixel_width + 1171; width = 2000; } } sequence->pixel_width = width; sequence->pixel_height = height; simplify(&sequence->pixel_width, &sequence->pixel_height); } int mpeg2_guess_aspect (const mpeg2_sequence_t * sequence, unsigned int * pixel_width, unsigned int * pixel_height) { static const struct { unsigned int width, height; } video_modes[] = { {720, 576}, /* 625 lines, 13.5 MHz (D1, DV, DVB, DVD) */ {704, 576}, /* 625 lines, 13.5 MHz (1/1 D1, DVB, DVD, 4CIF) */ {544, 576}, /* 625 lines, 10.125 MHz (DVB, laserdisc) */ {528, 576}, /* 625 lines, 10.125 MHz (3/4 D1, DVB, laserdisc) */ {480, 576}, /* 625 lines, 9 MHz (2/3 D1, DVB, SVCD) */ {352, 576}, /* 625 lines, 6.75 MHz (D2, 1/2 D1, CVD, DVB, DVD) */ {352, 288}, /* 625 lines, 6.75 MHz, 1 field (D4, VCD, DVB, DVD, CIF) */ {176, 144}, /* 625 lines, 3.375 MHz, half field (QCIF) */ {720, 486}, /* 525 lines, 13.5 MHz (D1) */ {704, 486}, /* 525 lines, 13.5 MHz */ {720, 480}, /* 525 lines, 13.5 MHz (DV, DSS, DVD) */ {704, 480}, /* 525 lines, 13.5 MHz (1/1 D1, ATSC, DVD) */ {544, 480}, /* 525 lines. 10.125 MHz (DSS, laserdisc) */ {528, 480}, /* 525 lines. 10.125 MHz (3/4 D1, laserdisc) */ {480, 480}, /* 525 lines, 9 MHz (2/3 D1, SVCD) */ {352, 480}, /* 525 lines, 6.75 MHz (D2, 1/2 D1, CVD, DVD) */ {352, 240} /* 525 lines. 6.75 MHz, 1 field (D4, VCD, DSS, DVD) */ }; unsigned int width, height, pix_width, pix_height, i, DAR_16_9; *pixel_width = sequence->pixel_width; *pixel_height = sequence->pixel_height; width = sequence->picture_width; height = sequence->picture_height; for (i = 0; i < sizeof (video_modes) / sizeof (video_modes[0]); i++) { if (width == video_modes[i].width && height == video_modes[i].height) break; } if (i == ARRAYLEN(video_modes) || (sequence->pixel_width == 1 && sequence->pixel_height == 1) || width != sequence->display_width || height != sequence->display_height) { return 0; } for (pix_height = 1; height * pix_height < 480; pix_height <<= 1); height *= pix_height; for (pix_width = 1; width * pix_width <= 352; pix_width <<= 1); width *= pix_width; if (!(sequence->flags & SEQ_FLAG_MPEG2)) { static unsigned int mpeg1_check[2][2] = {{11, 54}, {27, 45}}; DAR_16_9 = (sequence->pixel_height == 27 || sequence->pixel_height == 45); if (width < 704 || sequence->pixel_height != mpeg1_check[DAR_16_9][height == 576]) return 0; } else { DAR_16_9 = (3 * sequence->picture_width * sequence->pixel_width > 4 * sequence->picture_height * sequence->pixel_height); switch (width) { case 528: case 544: pix_width *= 4; pix_height *= 3; break; case 480: pix_width *= 3; pix_height *= 2; break; } } if (DAR_16_9) { pix_width *= 4; pix_height *= 3; } if (height == 576) { pix_width *= 59; pix_height *= 54; } else { pix_width *= 10; pix_height *= 11; } *pixel_width = pix_width; *pixel_height = pix_height; simplify (pixel_width, pixel_height); return (height == 576) ? 1 : 2; } static void copy_matrix (mpeg2dec_t * mpeg2dec, int index) { if (rb->memcmp (mpeg2dec->quantizer_matrix[index], mpeg2dec->new_quantizer_matrix[index], 64)) { rb->memcpy (mpeg2dec->quantizer_matrix[index], mpeg2dec->new_quantizer_matrix[index], 64); mpeg2dec->scaled[index] = -1; } } static void finalize_matrix (mpeg2dec_t * mpeg2dec) { mpeg2_decoder_t *decoder = &mpeg2dec->decoder; int i; for (i = 0; i < 2; i++) { if (mpeg2dec->copy_matrix & (1 << i)) copy_matrix (mpeg2dec, i); if ((mpeg2dec->copy_matrix & (4 << i)) && rb->memcmp(mpeg2dec->quantizer_matrix[i], mpeg2dec->new_quantizer_matrix[i+2], 64)) { copy_matrix (mpeg2dec, i + 2); decoder->chroma_quantizer[i] = decoder->quantizer_prescale[i+2]; } else if (mpeg2dec->copy_matrix & (5 << i)) { decoder->chroma_quantizer[i] = decoder->quantizer_prescale[i]; } } } static mpeg2_state_t invalid_end_action (mpeg2dec_t * mpeg2dec) { mpeg2_reset_info (&mpeg2dec->info); mpeg2dec->info.gop = NULL; info_user_data (mpeg2dec); mpeg2_header_state_init (mpeg2dec); mpeg2dec->sequence = mpeg2dec->new_sequence; mpeg2dec->action = mpeg2_seek_header; mpeg2dec->state = STATE_SEQUENCE; return STATE_SEQUENCE; } void mpeg2_header_sequence_finalize (mpeg2dec_t * mpeg2dec) { mpeg2_sequence_t * sequence = &mpeg2dec->new_sequence; mpeg2_decoder_t * decoder = &mpeg2dec->decoder; finalize_sequence(sequence); finalize_matrix(mpeg2dec); decoder->mpeg1 = !(sequence->flags & SEQ_FLAG_MPEG2); decoder->width = sequence->width; decoder->height = sequence->height; decoder->vertical_position_extension = sequence->picture_height > 2800; decoder->chroma_format = (sequence->chroma_width == sequence->width) + (sequence->chroma_height == sequence->height); if (mpeg2dec->sequence.width != (unsigned)-1) { /* * According to 6.1.1.6, repeat sequence headers should be * identical to the original. However some encoders don't * respect that and change various fields (including bitrate * and aspect ratio) in the repeat sequence headers. So we * choose to be as conservative as possible and only restart * the decoder if the width, height, chroma_width, * chroma_height or low_delay flag are modified. */ if (sequence->width != mpeg2dec->sequence.width || sequence->height != mpeg2dec->sequence.height || sequence->chroma_width != mpeg2dec->sequence.chroma_width || sequence->chroma_height != mpeg2dec->sequence.chroma_height || ((sequence->flags ^ mpeg2dec->sequence.flags) & SEQ_FLAG_LOW_DELAY)) { decoder->stride_frame = sequence->width; mpeg2_header_end (mpeg2dec); mpeg2dec->action = invalid_end_action; mpeg2dec->state = STATE_INVALID_END; return; } mpeg2dec->state = rb->memcmp(&mpeg2dec->sequence, sequence, sizeof (mpeg2_sequence_t)) ? STATE_SEQUENCE_MODIFIED : STATE_SEQUENCE_REPEATED; } else { decoder->stride_frame = sequence->width; } mpeg2dec->sequence = *sequence; mpeg2_reset_info(&mpeg2dec->info); mpeg2dec->info.sequence = &mpeg2dec->sequence; mpeg2dec->info.gop = NULL; info_user_data (mpeg2dec); } int mpeg2_header_gop (mpeg2dec_t * mpeg2dec) { uint8_t * buffer = mpeg2dec->chunk_start; mpeg2_gop_t * gop = &mpeg2dec->new_gop; if (!(buffer[1] & 8)) return 1; gop->hours = (buffer[0] >> 2) & 31; gop->minutes = ((buffer[0] << 4) | (buffer[1] >> 4)) & 63; gop->seconds = ((buffer[1] << 3) | (buffer[2] >> 5)) & 63; gop->pictures = ((buffer[2] << 1) | (buffer[3] >> 7)) & 63; gop->flags = (buffer[0] >> 7) | ((buffer[3] >> 4) & 6); mpeg2dec->state = STATE_GOP; return 0; } void mpeg2_header_gop_finalize (mpeg2dec_t * mpeg2dec) { mpeg2dec->gop = mpeg2dec->new_gop; mpeg2_reset_info (&mpeg2dec->info); mpeg2dec->info.gop = &mpeg2dec->gop; info_user_data (mpeg2dec); } void mpeg2_set_fbuf (mpeg2dec_t * mpeg2dec, int b_type) { int i; for (i = 0; i < 3; i++) { if (mpeg2dec->fbuf[1] != &mpeg2dec->fbuf_alloc[i].fbuf && mpeg2dec->fbuf[2] != &mpeg2dec->fbuf_alloc[i].fbuf) { mpeg2dec->fbuf[0] = &mpeg2dec->fbuf_alloc[i].fbuf; mpeg2dec->info.current_fbuf = mpeg2dec->fbuf[0]; if (b_type || (mpeg2dec->sequence.flags & SEQ_FLAG_LOW_DELAY)) { if (b_type || mpeg2dec->convert) mpeg2dec->info.discard_fbuf = mpeg2dec->fbuf[0]; mpeg2dec->info.display_fbuf = mpeg2dec->fbuf[0]; } break; } } } int mpeg2_header_picture (mpeg2dec_t * mpeg2dec) { uint8_t * buffer = mpeg2dec->chunk_start; mpeg2_picture_t * picture = &mpeg2dec->new_picture; mpeg2_decoder_t * decoder = &mpeg2dec->decoder; int type; mpeg2dec->state = (mpeg2dec->state != STATE_SLICE_1ST) ? STATE_PICTURE : STATE_PICTURE_2ND; mpeg2dec->ext_state = PIC_CODING_EXT; picture->temporal_reference = (buffer[0] << 2) | (buffer[1] >> 6); type = (buffer [1] >> 3) & 7; if (type == PIC_FLAG_CODING_TYPE_P || type == PIC_FLAG_CODING_TYPE_B) { /* forward_f_code and backward_f_code - used in mpeg1 only */ decoder->f_motion.f_code[1] = (buffer[3] >> 2) & 1; decoder->f_motion.f_code[0] = (((buffer[3] << 1) | (buffer[4] >> 7)) & 7) - 1; decoder->b_motion.f_code[1] = (buffer[4] >> 6) & 1; decoder->b_motion.f_code[0] = ((buffer[4] >> 3) & 7) - 1; } picture->flags = PIC_FLAG_PROGRESSIVE_FRAME | type; picture->tag = picture->tag2 = 0; if (mpeg2dec->num_tags) { if (mpeg2dec->bytes_since_tag >= mpeg2dec->chunk_ptr - buffer + 4) { mpeg2dec->num_tags = 0; picture->tag = mpeg2dec->tag_current; picture->tag2 = mpeg2dec->tag2_current; picture->flags |= PIC_FLAG_TAGS; } else if (mpeg2dec->num_tags > 1) { mpeg2dec->num_tags = 1; picture->tag = mpeg2dec->tag_previous; picture->tag2 = mpeg2dec->tag2_previous; picture->flags |= PIC_FLAG_TAGS; } } picture->nb_fields = 2; picture->display_offset[0].x = picture->display_offset[1].x = picture->display_offset[2].x = mpeg2dec->display_offset_x; picture->display_offset[0].y = picture->display_offset[1].y = picture->display_offset[2].y = mpeg2dec->display_offset_y; /* XXXXXX decode extra_information_picture as well */ mpeg2dec->q_scale_type = 0; decoder->intra_dc_precision = 7; decoder->frame_pred_frame_dct = 1; decoder->concealment_motion_vectors = 0; decoder->scan = mpeg2_scan_norm; decoder->picture_structure = FRAME_PICTURE; mpeg2dec->copy_matrix = 0; return 0; } static int picture_coding_ext (mpeg2dec_t * mpeg2dec) { uint8_t * buffer = mpeg2dec->chunk_start; mpeg2_picture_t * picture = &mpeg2dec->new_picture; mpeg2_decoder_t * decoder = &mpeg2dec->decoder; uint32_t flags; /* pre subtract 1 for use later in compute_motion_vector */ decoder->f_motion.f_code[0] = (buffer[0] & 15) - 1; decoder->f_motion.f_code[1] = (buffer[1] >> 4) - 1; decoder->b_motion.f_code[0] = (buffer[1] & 15) - 1; decoder->b_motion.f_code[1] = (buffer[2] >> 4) - 1; flags = picture->flags; decoder->intra_dc_precision = 7 - ((buffer[2] >> 2) & 3); decoder->picture_structure = buffer[2] & 3; switch (decoder->picture_structure) { case TOP_FIELD: flags |= PIC_FLAG_TOP_FIELD_FIRST; case BOTTOM_FIELD: picture->nb_fields = 1; break; case FRAME_PICTURE: if (!(mpeg2dec->sequence.flags & SEQ_FLAG_PROGRESSIVE_SEQUENCE)) { picture->nb_fields = (buffer[3] & 2) ? 3 : 2; flags |= (buffer[3] & 128) ? PIC_FLAG_TOP_FIELD_FIRST : 0; } else { picture->nb_fields = (buffer[3]&2) ? ((buffer[3]&128) ? 6 : 4) : 2; } break; default: return 1; } decoder->top_field_first = buffer[3] >> 7; decoder->frame_pred_frame_dct = (buffer[3] >> 6) & 1; decoder->concealment_motion_vectors = (buffer[3] >> 5) & 1; mpeg2dec->q_scale_type = buffer[3] & 16; decoder->intra_vlc_format = (buffer[3] >> 3) & 1; decoder->scan = (buffer[3] & 4) ? mpeg2_scan_alt : mpeg2_scan_norm; if (!(buffer[4] & 0x80)) flags &= ~PIC_FLAG_PROGRESSIVE_FRAME; if (buffer[4] & 0x40) { flags |= (((buffer[4]<<26) | (buffer[5]<<18) | (buffer[6]<<10)) & PIC_MASK_COMPOSITE_DISPLAY) | PIC_FLAG_COMPOSITE_DISPLAY; } picture->flags = flags; mpeg2dec->ext_state = PIC_DISPLAY_EXT | COPYRIGHT_EXT | QUANT_MATRIX_EXT; return 0; } static int picture_display_ext (mpeg2dec_t * mpeg2dec) { uint8_t * buffer = mpeg2dec->chunk_start; mpeg2_picture_t * picture = &mpeg2dec->new_picture; int i, nb_pos; nb_pos = picture->nb_fields; if (mpeg2dec->sequence.flags & SEQ_FLAG_PROGRESSIVE_SEQUENCE) nb_pos >>= 1; for (i = 0; i < nb_pos; i++) { int x, y; x = ((buffer[4*i] << 24) | (buffer[4*i+1] << 16) | (buffer[4*i+2] << 8) | buffer[4*i+3]) >> (11-2*i); y = ((buffer[4*i+2] << 24) | (buffer[4*i+3] << 16) | (buffer[4*i+4] << 8) | buffer[4*i+5]) >> (10-2*i); if (! (x & y & 1)) return 1; picture->display_offset[i].x = mpeg2dec->display_offset_x = x >> 1; picture->display_offset[i].y = mpeg2dec->display_offset_y = y >> 1; } for (; i < 3; i++) { picture->display_offset[i].x = mpeg2dec->display_offset_x; picture->display_offset[i].y = mpeg2dec->display_offset_y; } return 0; } void mpeg2_header_picture_finalize (mpeg2dec_t * mpeg2dec) { mpeg2_decoder_t * decoder = &mpeg2dec->decoder; int old_type_b = decoder->coding_type == B_TYPE; int low_delay = mpeg2dec->sequence.flags & SEQ_FLAG_LOW_DELAY; finalize_matrix (mpeg2dec); decoder->coding_type = mpeg2dec->new_picture.flags & PIC_MASK_CODING_TYPE; if (mpeg2dec->state == STATE_PICTURE) { mpeg2_picture_t * picture; mpeg2_picture_t * other; decoder->second_field = 0; picture = other = mpeg2dec->pictures; if (old_type_b ^ (mpeg2dec->picture < mpeg2dec->pictures + 2)) picture += 2; else other += 2; mpeg2dec->picture = picture; *picture = mpeg2dec->new_picture; if (!old_type_b) { mpeg2dec->fbuf[2] = mpeg2dec->fbuf[1]; mpeg2dec->fbuf[1] = mpeg2dec->fbuf[0]; } mpeg2dec->fbuf[0] = NULL; mpeg2_reset_info (&mpeg2dec->info); mpeg2dec->info.current_picture = picture; mpeg2dec->info.display_picture = picture; if (decoder->coding_type != B_TYPE) { if (!low_delay) { if (mpeg2dec->first) { mpeg2dec->info.display_picture = NULL; mpeg2dec->first = 0; } else { mpeg2dec->info.display_picture = other; if (other->nb_fields == 1) mpeg2dec->info.display_picture_2nd = other + 1; mpeg2dec->info.display_fbuf = mpeg2dec->fbuf[1]; } } if (!low_delay + !mpeg2dec->convert) { mpeg2dec->info.discard_fbuf = mpeg2dec->fbuf[!low_delay + !mpeg2dec->convert]; } } if (mpeg2dec->convert) { mpeg2_convert_init_t convert_init; if (!mpeg2dec->convert_start) { mpeg2dec->decoder.convert_id = mpeg2_malloc (mpeg2dec->convert_id_size, MPEG2_ALLOC_CONVERT_ID); mpeg2dec->convert (MPEG2_CONVERT_START, mpeg2dec->decoder.convert_id, &mpeg2dec->sequence, mpeg2dec->convert_stride, mpeg2dec->convert_arg, &convert_init); mpeg2dec->convert_start = convert_init.start; mpeg2dec->decoder.convert = convert_init.copy; int y_size = decoder->stride_frame * mpeg2dec->sequence.height; mpeg2dec->yuv_buf[0][0] = (uint8_t *) mpeg2_malloc(y_size, MPEG2_ALLOC_YUV); #if MPEG2_COLOR int uv_size = y_size >> (2 - mpeg2dec->decoder.chroma_format); mpeg2dec->yuv_buf[0][1] = (uint8_t *) mpeg2_malloc(uv_size, MPEG2_ALLOC_YUV); mpeg2dec->yuv_buf[0][2] = (uint8_t *) mpeg2_malloc(uv_size, MPEG2_ALLOC_YUV); #endif mpeg2dec->yuv_buf[1][0] = (uint8_t *) mpeg2_malloc(y_size, MPEG2_ALLOC_YUV); #if MPEG2_COLOR mpeg2dec->yuv_buf[1][1] = (uint8_t *) mpeg2_malloc(uv_size, MPEG2_ALLOC_YUV); mpeg2dec->yuv_buf[1][2] = (uint8_t *) mpeg2_malloc(uv_size, MPEG2_ALLOC_YUV); #endif y_size = decoder->stride_frame * 32; mpeg2dec->yuv_buf[2][0] = (uint8_t *) mpeg2_malloc(y_size, MPEG2_ALLOC_YUV); #if MPEG2_COLOR uv_size = y_size >> (2 - mpeg2dec->decoder.chroma_format); mpeg2dec->yuv_buf[2][1] = (uint8_t *) mpeg2_malloc(uv_size, MPEG2_ALLOC_YUV); mpeg2dec->yuv_buf[2][2] = (uint8_t *) mpeg2_malloc(uv_size, MPEG2_ALLOC_YUV); #endif } if (!mpeg2dec->custom_fbuf) { while (mpeg2dec->alloc_index < 3) { mpeg2_fbuf_t * fbuf; fbuf = &mpeg2dec->fbuf_alloc[mpeg2dec->alloc_index++].fbuf; fbuf->id = NULL; fbuf->buf[0] = (uint8_t *) mpeg2_malloc (convert_init.buf_size[0], MPEG2_ALLOC_CONVERTED); #if MPEG2_COLOR fbuf->buf[1] = (uint8_t *) mpeg2_malloc (convert_init.buf_size[1], MPEG2_ALLOC_CONVERTED); fbuf->buf[2] = (uint8_t *) mpeg2_malloc (convert_init.buf_size[2], MPEG2_ALLOC_CONVERTED); #endif } mpeg2_set_fbuf (mpeg2dec, (decoder->coding_type == B_TYPE)); } } else if (!mpeg2dec->custom_fbuf) { while (mpeg2dec->alloc_index < 3) { mpeg2_fbuf_t * fbuf; fbuf = &mpeg2dec->fbuf_alloc[mpeg2dec->alloc_index++].fbuf; fbuf->id = NULL; int y_size = decoder->stride_frame * mpeg2dec->sequence.height; fbuf->buf[0] = (uint8_t *) mpeg2_malloc (y_size, MPEG2_ALLOC_YUV); #if MPEG2_COLOR int uv_size = y_size >> (2 - decoder->chroma_format); fbuf->buf[1] = (uint8_t *) mpeg2_malloc (uv_size, MPEG2_ALLOC_YUV); fbuf->buf[2] = (uint8_t *) mpeg2_malloc (uv_size, MPEG2_ALLOC_YUV); #endif } mpeg2_set_fbuf (mpeg2dec, (decoder->coding_type == B_TYPE)); } } else { decoder->second_field = 1; mpeg2dec->picture++; /* second field picture */ *(mpeg2dec->picture) = mpeg2dec->new_picture; mpeg2dec->info.current_picture_2nd = mpeg2dec->picture; if (low_delay || decoder->coding_type == B_TYPE) mpeg2dec->info.display_picture_2nd = mpeg2dec->picture; } info_user_data (mpeg2dec); } static int copyright_ext (mpeg2dec_t * mpeg2dec) { (void)mpeg2dec; return 0; } static int quant_matrix_ext (mpeg2dec_t * mpeg2dec) { uint8_t * buffer = mpeg2dec->chunk_start; int i, j; for (i = 0; i < 4; i++) { if (buffer[0] & (8 >> i)) { for (j = 0; j < 64; j++) { mpeg2dec->new_quantizer_matrix[i][mpeg2_scan_norm[j]] = (buffer[j] << (i+5)) | (buffer[j+1] >> (3-i)); } mpeg2dec->copy_matrix |= 1 << i; buffer += 64; } } return 0; } int mpeg2_header_extension (mpeg2dec_t * mpeg2dec) { static int (* const parser[9]) (mpeg2dec_t *) = { NULL, sequence_ext, sequence_display_ext, quant_matrix_ext, copyright_ext, NULL, NULL, picture_display_ext, picture_coding_ext }; int ext, ext_bit; ext = mpeg2dec->chunk_start[0] >> 4; ext_bit = 1 << ext; if (!(mpeg2dec->ext_state & ext_bit)) return 0; /* ignore illegal extensions */ mpeg2dec->ext_state &= ~ext_bit; return parser[ext] (mpeg2dec); } int mpeg2_header_user_data (mpeg2dec_t * mpeg2dec) { mpeg2dec->user_data_len += mpeg2dec->chunk_ptr - 1 - mpeg2dec->chunk_start; mpeg2dec->chunk_start = mpeg2dec->chunk_ptr - 1; return 0; } static void prescale (mpeg2dec_t * mpeg2dec, int index) { static const int non_linear_scale[32] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16, 18, 20, 22, 24, 28, 32, 36, 40, 44, 48, 52, 56, 64, 72, 80, 88, 96, 104, 112 }; int i, j, k; mpeg2_decoder_t * decoder = &mpeg2dec->decoder; if (mpeg2dec->scaled[index] != mpeg2dec->q_scale_type) { mpeg2dec->scaled[index] = mpeg2dec->q_scale_type; for (i = 0; i < 32; i++) { k = mpeg2dec->q_scale_type ? non_linear_scale[i] : (i << 1); for (j = 0; j < 64; j++) { decoder->quantizer_prescale[index][i][j] = k * mpeg2dec->quantizer_matrix[index][j]; } } } } mpeg2_state_t mpeg2_header_slice_start (mpeg2dec_t * mpeg2dec) { mpeg2_decoder_t * decoder = &mpeg2dec->decoder; mpeg2dec->info.user_data = NULL; mpeg2dec->info.user_data_len = 0; mpeg2dec->state = (mpeg2dec->picture->nb_fields > 1 || mpeg2dec->state == STATE_PICTURE_2ND) ? STATE_SLICE : STATE_SLICE_1ST; if (mpeg2dec->decoder.coding_type != D_TYPE) { prescale (mpeg2dec, 0); if (decoder->chroma_quantizer[0] == decoder->quantizer_prescale[2]) prescale (mpeg2dec, 2); if (mpeg2dec->decoder.coding_type != I_TYPE) { prescale (mpeg2dec, 1); if (decoder->chroma_quantizer[1] == decoder->quantizer_prescale[3]) prescale (mpeg2dec, 3); } } if (!(mpeg2dec->nb_decode_slices)) { mpeg2dec->picture->flags |= PIC_FLAG_SKIP; } else if (mpeg2dec->convert_start) { mpeg2dec->convert_start (decoder->convert_id, mpeg2dec->fbuf[0], mpeg2dec->picture, mpeg2dec->info.gop); if (mpeg2dec->decoder.coding_type == B_TYPE) { mpeg2_init_fbuf (&mpeg2dec->decoder, mpeg2dec->yuv_buf[2], mpeg2dec->yuv_buf[mpeg2dec->yuv_index ^ 1], mpeg2dec->yuv_buf[mpeg2dec->yuv_index]); } else { mpeg2_init_fbuf (&mpeg2dec->decoder, mpeg2dec->yuv_buf[mpeg2dec->yuv_index ^ 1], mpeg2dec->yuv_buf[mpeg2dec->yuv_index], mpeg2dec->yuv_buf[mpeg2dec->yuv_index]); if (mpeg2dec->state == STATE_SLICE) mpeg2dec->yuv_index ^= 1; } } else { int b_type; b_type = (mpeg2dec->decoder.coding_type == B_TYPE); mpeg2_init_fbuf (&mpeg2dec->decoder, mpeg2dec->fbuf[0]->buf, mpeg2dec->fbuf[b_type + 1]->buf, mpeg2dec->fbuf[b_type]->buf); } mpeg2dec->action = NULL; return STATE_INTERNAL_NORETURN; } static mpeg2_state_t seek_sequence (mpeg2dec_t * mpeg2dec) { mpeg2_reset_info (&mpeg2dec->info); mpeg2dec->info.sequence = NULL; mpeg2dec->info.gop = NULL; mpeg2_header_state_init (mpeg2dec); mpeg2dec->action = mpeg2_seek_header; return mpeg2_seek_header (mpeg2dec); } mpeg2_state_t mpeg2_header_end (mpeg2dec_t * mpeg2dec) { mpeg2_picture_t * picture; int b_type; b_type = (mpeg2dec->decoder.coding_type == B_TYPE); picture = mpeg2dec->pictures; if ((mpeg2dec->picture >= picture + 2) ^ b_type) picture = mpeg2dec->pictures + 2; mpeg2_reset_info (&mpeg2dec->info); if (!(mpeg2dec->sequence.flags & SEQ_FLAG_LOW_DELAY)) { mpeg2dec->info.display_picture = picture; if (picture->nb_fields == 1) mpeg2dec->info.display_picture_2nd = picture + 1; mpeg2dec->info.display_fbuf = mpeg2dec->fbuf[b_type]; if (!mpeg2dec->convert) mpeg2dec->info.discard_fbuf = mpeg2dec->fbuf[b_type + 1]; } else if (!mpeg2dec->convert) { mpeg2dec->info.discard_fbuf = mpeg2dec->fbuf[b_type]; } mpeg2dec->action = seek_sequence; return STATE_END; }