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136 lines
3.8 KiB
136 lines
3.8 KiB
/* |
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* FLV decoding. |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "mpegvideo.h" |
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#include "h263.h" |
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#include "flv.h" |
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#include "libavutil/imgutils.h" |
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void ff_flv2_decode_ac_esc(GetBitContext *gb, int *level, int *run, int *last){ |
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int is11 = get_bits1(gb); |
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*last = get_bits1(gb); |
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*run = get_bits(gb, 6); |
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if(is11){ |
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*level = get_sbits(gb, 11); |
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} else { |
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*level = get_sbits(gb, 7); |
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} |
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} |
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int ff_flv_decode_picture_header(MpegEncContext *s) |
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{ |
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int format, width, height; |
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/* picture header */ |
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if (get_bits_long(&s->gb, 17) != 1) { |
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av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n"); |
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return -1; |
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} |
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format = get_bits(&s->gb, 5); |
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if (format != 0 && format != 1) { |
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av_log(s->avctx, AV_LOG_ERROR, "Bad picture format\n"); |
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return -1; |
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} |
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s->h263_flv = format+1; |
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s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */ |
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format = get_bits(&s->gb, 3); |
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switch (format) { |
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case 0: |
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width = get_bits(&s->gb, 8); |
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height = get_bits(&s->gb, 8); |
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break; |
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case 1: |
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width = get_bits(&s->gb, 16); |
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height = get_bits(&s->gb, 16); |
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break; |
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case 2: |
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width = 352; |
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height = 288; |
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break; |
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case 3: |
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width = 176; |
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height = 144; |
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break; |
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case 4: |
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width = 128; |
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height = 96; |
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break; |
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case 5: |
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width = 320; |
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height = 240; |
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break; |
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case 6: |
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width = 160; |
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height = 120; |
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break; |
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default: |
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width = height = 0; |
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break; |
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} |
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if(av_image_check_size(width, height, 0, s->avctx)) |
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return -1; |
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s->width = width; |
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s->height = height; |
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s->pict_type = AV_PICTURE_TYPE_I + get_bits(&s->gb, 2); |
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s->droppable = s->pict_type > AV_PICTURE_TYPE_P; |
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if (s->droppable) |
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s->pict_type = AV_PICTURE_TYPE_P; |
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skip_bits1(&s->gb); /* deblocking flag */ |
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s->chroma_qscale= s->qscale = get_bits(&s->gb, 5); |
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s->h263_plus = 0; |
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s->unrestricted_mv = 1; |
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s->h263_long_vectors = 0; |
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/* PEI */ |
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while (get_bits1(&s->gb) != 0) { |
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skip_bits(&s->gb, 8); |
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} |
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s->f_code = 1; |
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if(s->avctx->debug & FF_DEBUG_PICT_INFO){ |
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av_log(s->avctx, AV_LOG_DEBUG, "%c esc_type:%d, qp:%d num:%d\n", |
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s->droppable ? 'D' : av_get_picture_type_char(s->pict_type), |
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s->h263_flv - 1, s->qscale, s->picture_number); |
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} |
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s->y_dc_scale_table= |
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s->c_dc_scale_table= ff_mpeg1_dc_scale_table; |
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return 0; |
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} |
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AVCodec ff_flv_decoder = { |
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.name = "flv", |
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.long_name = NULL_IF_CONFIG_SMALL("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_FLV1, |
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.priv_data_size = sizeof(MpegEncContext), |
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.init = ff_h263_decode_init, |
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.close = ff_h263_decode_end, |
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.decode = ff_h263_decode_frame, |
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.capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1, |
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.pix_fmts = (const enum AVPixelFormat[]) { |
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AV_PIX_FMT_YUV420P, |
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AV_PIX_FMT_NONE |
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}, |
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};
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