GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/flvdec.c Lines: 37 67 55.2 %
Date: 2019-11-22 03:34:36 Branches: 11 26 42.3 %

Line Branch Exec Source
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/*
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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 "flv.h"
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#include "h263.h"
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#include "mpegvideo.h"
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#include "mpegvideodata.h"
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414
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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414
    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 AVERROR_INVALIDDATA;
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    }
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414
    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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414
    s->h263_flv       = format + 1;
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414
    s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */
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414
    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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362
    case 2:
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362
        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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1
    case 5:
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1
        width  = 320;
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1
        height = 240;
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1
        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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414
    if (av_image_check_size(width, height, 0, s->avctx))
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        return AVERROR(EINVAL);
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414
    s->width  = width;
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414
    s->height = height;
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414
    s->pict_type = AV_PICTURE_TYPE_I + get_bits(&s->gb, 2);
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414
    s->droppable = s->pict_type > AV_PICTURE_TYPE_P;
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414
    if (s->droppable)
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        s->pict_type = AV_PICTURE_TYPE_P;
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414
    skip_bits1(&s->gb); /* deblocking flag */
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414
    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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414
    s->h263_long_vectors = 0;
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    /* PEI */
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414
    if (skip_1stop_8data_bits(&s->gb) < 0)
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        return AVERROR_INVALIDDATA;
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414
    s->f_code = 1;
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414
    if (s->ehc_mode)
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        s->avctx->sample_aspect_ratio= (AVRational){1,2};
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414
    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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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   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
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    .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
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    .max_lowres     = 3,
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    .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
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                                                     AV_PIX_FMT_NONE },
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};