GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/truemotion2rt.c Lines: 94 106 88.7 %
Date: 2020-09-25 14:59:26 Branches: 62 72 86.1 %

Line Branch Exec Source
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/*
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 * Duck TrueMotion 2.0 Real Time decoder
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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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "libavutil/imgutils.h"
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#include "libavutil/internal.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/mem.h"
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#define BITSTREAM_READER_LE
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#include "avcodec.h"
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#include "get_bits.h"
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#include "internal.h"
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typedef struct TrueMotion2RTContext {
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    GetBitContext gb;
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    int delta_size;
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    int hscale;
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} TrueMotion2RTContext;
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static const int16_t delta_tab2[] = {
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    5, -7, 36, -36,
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};
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static const int16_t delta_tab3[] = {
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    2, -3, 8, -8, 18, -18, 36, -36,
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};
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static const int16_t delta_tab4[] = {
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    1, -1, 2, -3, 8, -8, 18, -18, 36, -36, 54, -54, 96, -96, 144, -144,
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};
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static const int16_t *const delta_tabs[] = {
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    delta_tab2, delta_tab3, delta_tab4,
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};
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/* Returns the number of bytes consumed from the bytestream, or
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 * AVERROR_INVALIDDATA if there was an error while decoding the header. */
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3
static int truemotion2rt_decode_header(AVCodecContext *avctx, const AVPacket *avpkt)
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{
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3
    TrueMotion2RTContext *s = avctx->priv_data;
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    int header_size;
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3
    uint8_t header_buffer[128] = { 0 };  /* logical maximum header size */
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3
    const uint8_t *buf = avpkt->data;
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3
    int size = avpkt->size;
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    int width, height;
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    int ret, i;
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3
    if (size < 1) {
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        av_log(avctx, AV_LOG_ERROR, "input packet too small (%d)\n", size);
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        return AVERROR_INVALIDDATA;
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    }
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3
    header_size = ((buf[0] >> 5) | (buf[0] << 3)) & 0x7f;
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3
    if (header_size < 10) {
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        av_log(avctx, AV_LOG_ERROR, "invalid header size (%d)\n", header_size);
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        return AVERROR_INVALIDDATA;
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    }
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3
    if (header_size + 1 > size) {
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        av_log(avctx, AV_LOG_ERROR, "input packet too small (%d)\n", size);
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        return AVERROR_INVALIDDATA;
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    }
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    /* unscramble the header bytes with a XOR operation */
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    for (i = 1; i < header_size; i++)
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        header_buffer[i - 1] = buf[i] ^ buf[i + 1];
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3
    s->delta_size = header_buffer[1];
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3
    s->hscale = 1 + !!header_buffer[3];
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    if (s->delta_size < 2 || s->delta_size > 4)
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        return AVERROR_INVALIDDATA;
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3
    height = AV_RL16(header_buffer + 5);
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3
    width  = AV_RL16(header_buffer + 7);
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    ret = ff_set_dimensions(avctx, width, height);
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3
    if (ret < 0)
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        return ret;
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    av_log(avctx, AV_LOG_DEBUG, "Header size: %d\n", header_size);
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3
    return header_size;
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}
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3
static int truemotion2rt_decode_frame(AVCodecContext *avctx, void *data,
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                                      int *got_frame, AVPacket *avpkt)
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{
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3
    TrueMotion2RTContext *s = avctx->priv_data;
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3
    AVFrame * const p = data;
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3
    GetBitContext *gb = &s->gb;
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    uint8_t *dst;
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    int x, y, delta_mode;
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    int ret;
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3
    ret = truemotion2rt_decode_header(avctx, avpkt);
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3
    if (ret < 0)
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        return ret;
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3
    if ((avctx->width + s->hscale - 1)/ s->hscale * avctx->height * s->delta_size > avpkt->size * 8LL * 4)
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        return AVERROR_INVALIDDATA;
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3
    ret = init_get_bits8(gb, avpkt->data + ret, avpkt->size - ret);
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3
    if (ret < 0)
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        return ret;
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3
    ret = ff_get_buffer(avctx, p, 0);
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3
    if (ret < 0)
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        return ret;
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3
    skip_bits(gb, 32);
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3
    delta_mode = s->delta_size - 2;
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    dst = p->data[0];
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663
    for (y = 0; y < avctx->height; y++) {
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        int diff = 0;
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93428
        for (x = 0; x < avctx->width; x += s->hscale) {
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92768
            diff  += delta_tabs[delta_mode][get_bits(gb, s->delta_size)];
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92768
            dst[x] = av_clip_uint8((y ? dst[x - p->linesize[0]] : 0) + diff);
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        }
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        dst += p->linesize[0];
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    }
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    if (s->hscale > 1) {
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        dst = p->data[0];
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        for (y = 0; y < avctx->height; y++) {
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            for (x = 1; x < avctx->width; x += s->hscale)
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                dst[x] = dst[x - 1];
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            dst += p->linesize[0];
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        }
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    }
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    dst = p->data[0];
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663
    for (y = 0; y < avctx->height; y++) {
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        for (x = 0; x < avctx->width; x++)
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137280
            dst[x] = av_clip_uint8(dst[x] + (dst[x] - 128) / 3);
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        dst += p->linesize[0];
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    }
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    dst = p->data[1];
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    for (y = 0; y < avctx->height >> 2; y++) {
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        int diff = 0;
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5963
        for (x = 0; x < avctx->width >> 2; x += s->hscale) {
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5798
            diff  += delta_tabs[delta_mode][get_bits(gb, s->delta_size)];
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5798
            dst[x] = av_clip_uint8((y ? dst[x - p->linesize[1]] : 128) + diff);
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        }
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        dst += p->linesize[1];
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    }
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3
    if (s->hscale > 1) {
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2
        dst = p->data[1];
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        for (y = 0; y < avctx->height >> 2; y++) {
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2889
            for (x = 1; x < avctx->width >> 2; x += s->hscale)
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2782
                dst[x] = dst[x - 1];
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107
            dst += p->linesize[1];
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        }
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    }
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3
    dst = p->data[1];
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    for (y = 0; y < avctx->height >> 2; y++) {
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8745
        for (x = 0; x < avctx->width >> 2; x++)
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8580
            dst[x] += (dst[x] - 128) / 8;
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        dst += p->linesize[1];
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    }
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3
    dst = p->data[2];
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    for (y = 0; y < avctx->height >> 2; y++) {
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        int diff = 0;
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5963
        for (x = 0; x < avctx->width >> 2; x += s->hscale) {
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5798
            diff  += delta_tabs[delta_mode][get_bits(gb, s->delta_size)];
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5798
            dst[x] = av_clip_uint8((y ? dst[x - p->linesize[2]] : 128) + diff);
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        }
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        dst += p->linesize[2];
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    }
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3
    if (s->hscale > 1) {
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2
        dst = p->data[2];
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        for (y = 0; y < avctx->height >> 2; y++) {
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2889
            for (x = 1; x < avctx->width >> 2; x += s->hscale)
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2782
                dst[x] = dst[x - 1];
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            dst += p->linesize[2];
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        }
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    }
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    dst = p->data[2];
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    for (y = 0; y < avctx->height >> 2; y++) {
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8745
        for (x = 0; x < avctx->width >> 2; x++)
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8580
            dst[x] += (dst[x] - 128) / 8;
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165
        dst += p->linesize[2];
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    }
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3
    p->pict_type = AV_PICTURE_TYPE_I;
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3
    p->key_frame = 1;
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3
    *got_frame = 1;
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    return avpkt->size;
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}
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static av_cold int truemotion2rt_decode_init(AVCodecContext *avctx)
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{
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6
    avctx->pix_fmt = AV_PIX_FMT_YUV410P;
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6
    return 0;
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}
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AVCodec ff_truemotion2rt_decoder = {
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    .name           = "truemotion2rt",
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    .long_name      = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0 Real Time"),
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    .type           = AVMEDIA_TYPE_VIDEO,
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    .id             = AV_CODEC_ID_TRUEMOTION2RT,
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    .priv_data_size = sizeof(TrueMotion2RTContext),
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    .init           = truemotion2rt_decode_init,
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    .decode         = truemotion2rt_decode_frame,
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    .capabilities   = AV_CODEC_CAP_DR1,
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    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
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};