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Diffstat (limited to 'libmpeg2/header.c')
| -rw-r--r-- | libmpeg2/header.c | 964 |
1 files changed, 964 insertions, 0 deletions
diff --git a/libmpeg2/header.c b/libmpeg2/header.c new file mode 100644 index 0000000..6e286d6 --- /dev/null +++ b/libmpeg2/header.c @@ -0,0 +1,964 @@ +/* + * header.c + * Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org> + * Copyright (C) 2003 Regis Duchesne <hpreg@zoy.org> + * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca> + * + * 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 + */ + +#include "config.h" + +#include <inttypes.h> +#include <stdlib.h> /* defines NULL */ +#include <string.h> /* memcmp */ + +#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] ATTR_ALIGN(16) = { + 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 +}; + +uint8_t mpeg2_scan_norm[64] ATTR_ALIGN(16) = { + /* 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 +}; + +uint8_t mpeg2_scan_alt[64] ATTR_ALIGN(16) = { + /* 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 +}; + +void mpeg2_header_state_init (mpeg2dec_t * mpeg2dec) +{ + if (mpeg2dec->sequence.width != (unsigned)-1) { + int i; + + mpeg2dec->sequence.width = (unsigned)-1; + if (!mpeg2dec->custom_fbuf) + for (i = mpeg2dec->alloc_index_user; + i < mpeg2dec->alloc_index; i++) { + mpeg2_free (mpeg2dec->fbuf_alloc[i].fbuf.buf[0]); + mpeg2_free (mpeg2dec->fbuf_alloc[i].fbuf.buf[1]); + mpeg2_free (mpeg2dec->fbuf_alloc[i].fbuf.buf[2]); + } + if (mpeg2dec->convert_start) + for (i = 0; i < 3; i++) { + mpeg2_free (mpeg2dec->yuv_buf[i][0]); + mpeg2_free (mpeg2dec->yuv_buf[i][1]); + mpeg2_free (mpeg2dec->yuv_buf[i][2]); + } + if (mpeg2dec->decoder.convert_id) + mpeg2_free (mpeg2dec->decoder.convert_id); + } + 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) +{ + uint8_t * buffer = mpeg2dec->chunk_start; + mpeg2_sequence_t * sequence = &(mpeg2dec->new_sequence); + static 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 + }; + 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 + 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->display_width = sequence->picture_width += + ((buffer[1] << 13) | (buffer[2] << 5)) & 0x3000; + sequence->display_height = sequence->picture_height += + (buffer[2] << 7) & 0x3000; + 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; + 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]>>5)&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); + + 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; + + if( (buffer[1] << 6) | (buffer[2] >> 2) ) + sequence->display_width = (buffer[1] << 6) | (buffer[2] >> 2); + if( ((buffer[2]& 1 ) << 13) | (buffer[3] << 5) | (buffer[4] >> 3) ) + sequence->display_height = + ((buffer[2]& 1 ) << 13) | (buffer[3] << 5) | (buffer[4] >> 3); + + return 0; +} + +static inline void simplify (unsigned int * u, unsigned int * v) +{ + unsigned int a, b, tmp; + + a = *u; b = *v; + while (a) { /* find greatest common divisor */ + 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 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 == sizeof (video_modes) / sizeof (video_modes[0]) || + (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 idx) +{ + if (memcmp (mpeg2dec->quantizer_matrix[idx], + mpeg2dec->new_quantizer_matrix[idx], 64)) { + memcpy (mpeg2dec->quantizer_matrix[idx], + mpeg2dec->new_quantizer_matrix[idx], 64); + mpeg2dec->scaled[idx] = -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)) && + 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 do not + * 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 = (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 */ + + decoder->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; + flags |= (buffer[3] & 2) ? PIC_FLAG_REPEAT_FIRST_FIELD : 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; + decoder->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, uint32_t accels) +{ + 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) { + int y_size, uv_size; + + 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, accels, + mpeg2dec->convert_arg, &convert_init); + mpeg2dec->convert_start = convert_init.start; + mpeg2dec->decoder.convert = convert_init.copy; + + y_size = decoder->stride_frame * mpeg2dec->sequence.height; + uv_size = y_size >> (2 - mpeg2dec->decoder.chroma_format); + mpeg2dec->yuv_buf[0][0] = + (uint8_t *) mpeg2_malloc (y_size, MPEG2_ALLOC_YUV); + 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); + mpeg2dec->yuv_buf[1][0] = + (uint8_t *) mpeg2_malloc (y_size, MPEG2_ALLOC_YUV); + 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); + y_size = decoder->stride_frame * 32; + uv_size = y_size >> (2 - mpeg2dec->decoder.chroma_format); + mpeg2dec->yuv_buf[2][0] = + (uint8_t *) mpeg2_malloc (y_size, MPEG2_ALLOC_YUV); + 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); + } + 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); + 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); + } + mpeg2_set_fbuf (mpeg2dec, (decoder->coding_type == B_TYPE)); + } + } else if (!mpeg2dec->custom_fbuf) { + while (mpeg2dec->alloc_index < 3) { + mpeg2_fbuf_t * fbuf; + int y_size, uv_size; + + fbuf = &(mpeg2dec->fbuf_alloc[mpeg2dec->alloc_index++].fbuf); + fbuf->id = NULL; + y_size = decoder->stride_frame * mpeg2dec->sequence.height; + uv_size = y_size >> (2 - decoder->chroma_format); + fbuf->buf[0] = (uint8_t *) mpeg2_malloc (y_size, + MPEG2_ALLOC_YUV); + fbuf->buf[1] = (uint8_t *) mpeg2_malloc (uv_size, + MPEG2_ALLOC_YUV); + fbuf->buf[2] = (uint8_t *) mpeg2_malloc (uv_size, + MPEG2_ALLOC_YUV); + } + 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) +{ + 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 (* parser[]) (mpeg2dec_t *) = { + 0, sequence_ext, sequence_display_ext, quant_matrix_ext, + copyright_ext, 0, 0, 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 idx) +{ + static int non_linear_scale [] = { + 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[idx] != decoder->q_scale_type) { + mpeg2dec->scaled[idx] = decoder->q_scale_type; + for (i = 0; i < 32; i++) { + k = decoder->q_scale_type ? non_linear_scale[i] : (i << 1); + for (j = 0; j < 64; j++) + decoder->quantizer_prescale[idx][i][j] = + k * mpeg2dec->quantizer_matrix[idx][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; +} |