GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/zerocodec.c Lines: 51 65 78.5 %
Date: 2020-09-25 23:16:12 Branches: 17 24 70.8 %

Line Branch Exec Source
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/*
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 * ZeroCodec Decoder
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 *
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 * Copyright (c) 2012, Derek Buitenhuis
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 *
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 * Permission to use, copy, modify, and/or distribute this software for any
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 * purpose with or without fee is hereby granted, provided that the above
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 * copyright notice and this permission notice appear in all copies.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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 */
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#include <zlib.h>
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#include "avcodec.h"
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#include "internal.h"
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#include "libavutil/common.h"
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typedef struct ZeroCodecContext {
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    AVFrame  *previous_frame;
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    z_stream zstream;
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} ZeroCodecContext;
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static int zerocodec_decode_frame(AVCodecContext *avctx, void *data,
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                                  int *got_frame, AVPacket *avpkt)
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{
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    ZeroCodecContext *zc = avctx->priv_data;
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    AVFrame *pic         = data;
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    AVFrame *prev_pic    = zc->previous_frame;
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    z_stream *zstream    = &zc->zstream;
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    uint8_t *prev        = prev_pic->data[0];
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    uint8_t *dst;
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    int i, j, zret, ret;
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    if (avpkt->flags & AV_PKT_FLAG_KEY) {
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3
        pic->key_frame = 1;
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        pic->pict_type = AV_PICTURE_TYPE_I;
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    } else {
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        if (!prev) {
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            av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
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            return AVERROR_INVALIDDATA;
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        }
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        prev += (avctx->height - 1) * prev_pic->linesize[0];
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        pic->key_frame = 0;
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        pic->pict_type = AV_PICTURE_TYPE_P;
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    }
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    zret = inflateReset(zstream);
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    if (zret != Z_OK) {
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        av_log(avctx, AV_LOG_ERROR, "Could not reset inflate: %d.\n", zret);
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        return AVERROR_INVALIDDATA;
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    }
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    if ((ret = ff_get_buffer(avctx, pic, AV_GET_BUFFER_FLAG_REF)) < 0)
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        return ret;
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    zstream->next_in  = avpkt->data;
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    zstream->avail_in = avpkt->size;
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    dst = pic->data[0] + (avctx->height - 1) * pic->linesize[0];
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    /**
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     * ZeroCodec has very simple interframe compression. If a value
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     * is the same as the previous frame, set it to 0.
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     */
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    for (i = 0; i < avctx->height; i++) {
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27360
        zstream->next_out  = dst;
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        zstream->avail_out = avctx->width << 1;
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        zret = inflate(zstream, Z_SYNC_FLUSH);
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        if (zret != Z_OK && zret != Z_STREAM_END) {
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            av_log(avctx, AV_LOG_ERROR,
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                   "Inflate failed with return code: %d.\n", zret);
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            return AVERROR_INVALIDDATA;
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        }
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        if (!(avpkt->flags & AV_PKT_FLAG_KEY))
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            for (j = 0; j < avctx->width << 1; j++)
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64512000
                dst[j] += prev[j] & -!dst[j];
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        prev -= prev_pic->linesize[0];
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        dst  -= pic->linesize[0];
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    }
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    av_frame_unref(zc->previous_frame);
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    if ((ret = av_frame_ref(zc->previous_frame, pic)) < 0)
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        return ret;
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    *got_frame = 1;
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    return avpkt->size;
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}
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static av_cold int zerocodec_decode_close(AVCodecContext *avctx)
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{
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    ZeroCodecContext *zc = avctx->priv_data;
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    av_frame_free(&zc->previous_frame);
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    inflateEnd(&zc->zstream);
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    return 0;
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}
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static av_cold int zerocodec_decode_init(AVCodecContext *avctx)
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{
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    ZeroCodecContext *zc = avctx->priv_data;
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    z_stream *zstream    = &zc->zstream;
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    int zret;
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    avctx->pix_fmt             = AV_PIX_FMT_UYVY422;
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    avctx->bits_per_raw_sample = 8;
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    zstream->zalloc = Z_NULL;
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    zstream->zfree  = Z_NULL;
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    zstream->opaque = Z_NULL;
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    zret = inflateInit(zstream);
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    if (zret != Z_OK) {
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        av_log(avctx, AV_LOG_ERROR, "Could not initialize inflate: %d.\n", zret);
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        return AVERROR(ENOMEM);
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    }
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    zc->previous_frame = av_frame_alloc();
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    if (!zc->previous_frame)
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        return AVERROR(ENOMEM);
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    return 0;
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}
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static void zerocodec_decode_flush(AVCodecContext *avctx)
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{
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    ZeroCodecContext *zc = avctx->priv_data;
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    av_frame_unref(zc->previous_frame);
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}
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AVCodec ff_zerocodec_decoder = {
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    .type           = AVMEDIA_TYPE_VIDEO,
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    .name           = "zerocodec",
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    .long_name      = NULL_IF_CONFIG_SMALL("ZeroCodec Lossless Video"),
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    .id             = AV_CODEC_ID_ZEROCODEC,
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    .priv_data_size = sizeof(ZeroCodecContext),
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    .init           = zerocodec_decode_init,
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    .decode         = zerocodec_decode_frame,
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    .flush          = zerocodec_decode_flush,
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    .close          = zerocodec_decode_close,
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    .capabilities   = AV_CODEC_CAP_DR1,
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    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE |
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                      FF_CODEC_CAP_INIT_CLEANUP,
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};