0,0 → 1,138 |
/* |
* H.263i decoder |
* |
* This file is part of FFmpeg. |
* |
* FFmpeg is free software; you can redistribute it and/or |
* modify it under the terms of the GNU Lesser General Public |
* License as published by the Free Software Foundation; either |
* version 2.1 of the License, or (at your option) any later version. |
* |
* FFmpeg 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 |
* Lesser General Public License for more details. |
* |
* You should have received a copy of the GNU Lesser General Public |
* License along with FFmpeg; if not, write to the Free Software |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
*/ |
|
#include "mpegvideo.h" |
#include "h263.h" |
|
/* don't understand why they choose a different header ! */ |
int ff_intel_h263_decode_picture_header(MpegEncContext *s) |
{ |
int format; |
|
/* picture header */ |
if (get_bits_long(&s->gb, 22) != 0x20) { |
av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n"); |
return -1; |
} |
s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */ |
|
if (get_bits1(&s->gb) != 1) { |
av_log(s->avctx, AV_LOG_ERROR, "Bad marker\n"); |
return -1; /* marker */ |
} |
if (get_bits1(&s->gb) != 0) { |
av_log(s->avctx, AV_LOG_ERROR, "Bad H263 id\n"); |
return -1; /* h263 id */ |
} |
skip_bits1(&s->gb); /* split screen off */ |
skip_bits1(&s->gb); /* camera off */ |
skip_bits1(&s->gb); /* freeze picture release off */ |
|
format = get_bits(&s->gb, 3); |
if (format == 0 || format == 6) { |
av_log(s->avctx, AV_LOG_ERROR, "Intel H263 free format not supported\n"); |
return -1; |
} |
s->h263_plus = 0; |
|
s->pict_type = AV_PICTURE_TYPE_I + get_bits1(&s->gb); |
|
s->h263_long_vectors = get_bits1(&s->gb); |
|
if (get_bits1(&s->gb) != 0) { |
av_log(s->avctx, AV_LOG_ERROR, "SAC not supported\n"); |
return -1; /* SAC: off */ |
} |
s->obmc= get_bits1(&s->gb); |
s->unrestricted_mv = s->obmc || s->h263_long_vectors; |
s->pb_frame = get_bits1(&s->gb); |
|
if (format < 6) { |
s->width = ff_h263_format[format][0]; |
s->height = ff_h263_format[format][1]; |
s->avctx->sample_aspect_ratio.num = 12; |
s->avctx->sample_aspect_ratio.den = 11; |
} else { |
format = get_bits(&s->gb, 3); |
if(format == 0 || format == 7){ |
av_log(s->avctx, AV_LOG_ERROR, "Wrong Intel H263 format\n"); |
return -1; |
} |
if(get_bits(&s->gb, 2)) |
av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n"); |
s->loop_filter = get_bits1(&s->gb) * !s->avctx->lowres; |
if(get_bits1(&s->gb)) |
av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n"); |
if(get_bits1(&s->gb)) |
s->pb_frame = 2; |
if(get_bits(&s->gb, 5)) |
av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n"); |
if(get_bits(&s->gb, 5) != 1) |
av_log(s->avctx, AV_LOG_ERROR, "Invalid marker\n"); |
} |
if(format == 6){ |
int ar = get_bits(&s->gb, 4); |
skip_bits(&s->gb, 9); // display width |
skip_bits1(&s->gb); |
skip_bits(&s->gb, 9); // display height |
if(ar == 15){ |
s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 8); // aspect ratio - width |
s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 8); // aspect ratio - height |
} else { |
s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[ar]; |
} |
if (s->avctx->sample_aspect_ratio.num == 0) |
av_log(s->avctx, AV_LOG_ERROR, "Invalid aspect ratio.\n"); |
} |
|
s->chroma_qscale= s->qscale = get_bits(&s->gb, 5); |
skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */ |
|
if(s->pb_frame){ |
skip_bits(&s->gb, 3); //temporal reference for B-frame |
skip_bits(&s->gb, 2); //dbquant |
} |
|
/* PEI */ |
while (get_bits1(&s->gb) != 0) { |
skip_bits(&s->gb, 8); |
} |
s->f_code = 1; |
|
s->y_dc_scale_table= |
s->c_dc_scale_table= ff_mpeg1_dc_scale_table; |
|
ff_h263_show_pict_info(s); |
|
return 0; |
} |
|
AVCodec ff_h263i_decoder = { |
.name = "h263i", |
.long_name = NULL_IF_CONFIG_SMALL("Intel H.263"), |
.type = AVMEDIA_TYPE_VIDEO, |
.id = AV_CODEC_ID_H263I, |
.priv_data_size = sizeof(MpegEncContext), |
.init = ff_h263_decode_init, |
.close = ff_h263_decode_end, |
.decode = ff_h263_decode_frame, |
.capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1, |
.pix_fmts = ff_pixfmt_list_420, |
}; |