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-rw-r--r--apps/plugins/mpegplayer/libmpeg2/header.c1286
1 files changed, 1286 insertions, 0 deletions
diff --git a/apps/plugins/mpegplayer/libmpeg2/header.c b/apps/plugins/mpegplayer/libmpeg2/header.c
new file mode 100644
index 0000000000..001cafe7d5
--- /dev/null
+++ b/apps/plugins/mpegplayer/libmpeg2/header.c
@@ -0,0 +1,1286 @@
+/*
+ * 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
+ *
+ * $Id$
+ * 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;
+ 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;
+}