Function cinepak_decode

libavcodec/cinepak.c:369–422

}

static int cinepak_decode (CinepakContext *s)
{
    const uint8_t  *eod = (s->data + s->size);
    int           i, result, strip_size, frame_flags, num_strips;
    int           y0 = 0;

    frame_flags = s->data[0];
    num_strips  = AV_RB16 (&s->data[8]);

    s->data += 10 + s->sega_film_skip_bytes;

    num_strips = FFMIN(num_strips, MAX_STRIPS);

    s->frame->flags &= ~AV_FRAME_FLAG_KEY;

    for (i=0; i < num_strips; i++) {
        if ((s->data + 12) > eod)
            return AVERROR_INVALIDDATA;

        s->strips[i].id = s->data[0];
/* zero y1 means "relative to the previous stripe" */
        if (!(s->strips[i].y1 = AV_RB16 (&s->data[4])))
            s->strips[i].y2 = (s->strips[i].y1 = y0) + AV_RB16 (&s->data[8]);
        else
            s->strips[i].y2 = AV_RB16 (&s->data[8]);
        s->strips[i].x1 = AV_RB16 (&s->data[6]);
        s->strips[i].x2 = AV_RB16 (&s->data[10]);

        if (s->strips[i].id == 0x10)
            s->frame->flags |= AV_FRAME_FLAG_KEY;

        strip_size = AV_RB24 (&s->data[1]) - 12;
        if (strip_size < 0)
            return AVERROR_INVALIDDATA;
        s->data   += 12;
        strip_size = ((s->data + strip_size) > eod) ? (eod - s->data) : strip_size;

        if ((i > 0) && !(frame_flags & 0x01)) {
            memcpy (s->strips[i].v4_codebook, s->strips[i-1].v4_codebook,
                sizeof(s->strips[i].v4_codebook));
            memcpy (s->strips[i].v1_codebook, s->strips[i-1].v1_codebook,
                sizeof(s->strips[i].v1_codebook));
        }

        result = cinepak_decode_strip (s, &s->strips[i], s->data, strip_size);

        if (result != 0)
            return result;

        s->data += strip_size;
        y0    = s->strips[i].y2;
    }
    return 0;
}

static av_cold int cinepak_decode_init(AVCodecContext *avctx)
{