yading@10: /*
yading@10:  * FLV decoding.
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include "mpegvideo.h"
yading@10: #include "h263.h"
yading@10: #include "flv.h"
yading@10: #include "libavutil/imgutils.h"
yading@10: 
yading@10: void ff_flv2_decode_ac_esc(GetBitContext *gb, int *level, int *run, int *last){
yading@10:     int is11 = get_bits1(gb);
yading@10:     *last = get_bits1(gb);
yading@10:     *run = get_bits(gb, 6);
yading@10:     if(is11){
yading@10:         *level = get_sbits(gb, 11);
yading@10:     } else {
yading@10:         *level = get_sbits(gb, 7);
yading@10:     }
yading@10: }
yading@10: 
yading@10: int ff_flv_decode_picture_header(MpegEncContext *s)
yading@10: {
yading@10:     int format, width, height;
yading@10: 
yading@10:     /* picture header */
yading@10:     if (get_bits_long(&s->gb, 17) != 1) {
yading@10:         av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     format = get_bits(&s->gb, 5);
yading@10:     if (format != 0 && format != 1) {
yading@10:         av_log(s->avctx, AV_LOG_ERROR, "Bad picture format\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     s->h263_flv = format+1;
yading@10:     s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */
yading@10:     format = get_bits(&s->gb, 3);
yading@10:     switch (format) {
yading@10:     case 0:
yading@10:         width = get_bits(&s->gb, 8);
yading@10:         height = get_bits(&s->gb, 8);
yading@10:         break;
yading@10:     case 1:
yading@10:         width = get_bits(&s->gb, 16);
yading@10:         height = get_bits(&s->gb, 16);
yading@10:         break;
yading@10:     case 2:
yading@10:         width = 352;
yading@10:         height = 288;
yading@10:         break;
yading@10:     case 3:
yading@10:         width = 176;
yading@10:         height = 144;
yading@10:         break;
yading@10:     case 4:
yading@10:         width = 128;
yading@10:         height = 96;
yading@10:         break;
yading@10:     case 5:
yading@10:         width = 320;
yading@10:         height = 240;
yading@10:         break;
yading@10:     case 6:
yading@10:         width = 160;
yading@10:         height = 120;
yading@10:         break;
yading@10:     default:
yading@10:         width = height = 0;
yading@10:         break;
yading@10:     }
yading@10:     if(av_image_check_size(width, height, 0, s->avctx))
yading@10:         return AVERROR(EINVAL);
yading@10:     s->width = width;
yading@10:     s->height = height;
yading@10: 
yading@10:     s->pict_type = AV_PICTURE_TYPE_I + get_bits(&s->gb, 2);
yading@10:     s->droppable = s->pict_type > AV_PICTURE_TYPE_P;
yading@10:     if (s->droppable)
yading@10:         s->pict_type = AV_PICTURE_TYPE_P;
yading@10: 
yading@10:     skip_bits1(&s->gb); /* deblocking flag */
yading@10:     s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
yading@10: 
yading@10:     s->h263_plus = 0;
yading@10: 
yading@10:     s->unrestricted_mv = 1;
yading@10:     s->h263_long_vectors = 0;
yading@10: 
yading@10:     /* PEI */
yading@10:     while (get_bits1(&s->gb) != 0) {
yading@10:         skip_bits(&s->gb, 8);
yading@10:     }
yading@10:     s->f_code = 1;
yading@10: 
yading@10:     if(s->avctx->debug & FF_DEBUG_PICT_INFO){
yading@10:         av_log(s->avctx, AV_LOG_DEBUG, "%c esc_type:%d, qp:%d num:%d\n",
yading@10:                s->droppable ? 'D' : av_get_picture_type_char(s->pict_type),
yading@10:                s->h263_flv - 1, s->qscale, s->picture_number);
yading@10:     }
yading@10: 
yading@10:     s->y_dc_scale_table=
yading@10:     s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: AVCodec ff_flv_decoder = {
yading@10:     .name           = "flv",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_FLV1,
yading@10:     .priv_data_size = sizeof(MpegEncContext),
yading@10:     .init           = ff_h263_decode_init,
yading@10:     .close          = ff_h263_decode_end,
yading@10:     .decode         = ff_h263_decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
yading@10:     .max_lowres     = 3,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"),
yading@10:     .pix_fmts       = ff_pixfmt_list_420,
yading@10: };