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https://github.com/FFmpeg/FFmpeg.git
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4243da4ff4
This is possible, because every given FFCodec has to implement exactly one of these. Doing so decreases sizeof(FFCodec) and therefore decreases the size of the binary. Notice that in case of position-independent code the decrease is in .data.rel.ro, so that this translates to decreased memory consumption. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
132 lines
3.9 KiB
C
132 lines
3.9 KiB
C
/*
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* FLV decoding.
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 "libavutil/imgutils.h"
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#include "codec_internal.h"
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#include "flvdec.h"
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#include "h263dec.h"
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#include "mpegvideo.h"
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#include "mpegvideodata.h"
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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(&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 AVERROR_INVALIDDATA;
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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 AVERROR_INVALIDDATA;
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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 AVERROR(EINVAL);
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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->h263_long_vectors = 0;
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/* PEI */
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if (skip_1stop_8data_bits(&s->gb) < 0)
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return AVERROR_INVALIDDATA;
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s->f_code = 1;
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if (s->ehc_mode)
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s->avctx->sample_aspect_ratio= (AVRational){1,2};
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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 = s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
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return 0;
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}
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const FFCodec ff_flv_decoder = {
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.p.name = "flv",
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.p.long_name = NULL_IF_CONFIG_SMALL("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.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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FF_CODEC_DECODE_CB(ff_h263_decode_frame),
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.p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
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FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
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.p.max_lowres = 3,
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.p.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
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AV_PIX_FMT_NONE },
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};
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