diff options
Diffstat (limited to 'ffmpeg/libavcodec/intelh263dec.c')
| -rw-r--r-- | ffmpeg/libavcodec/intelh263dec.c | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/intelh263dec.c b/ffmpeg/libavcodec/intelh263dec.c new file mode 100644 index 0000000..ac2695e --- /dev/null +++ b/ffmpeg/libavcodec/intelh263dec.c @@ -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", + .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, + .long_name = NULL_IF_CONFIG_SMALL("Intel H.263"), + .pix_fmts = ff_pixfmt_list_420, +}; |