Function decode_frame

libavcodec/iff.c:1523–1901

}

static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
                        int *got_frame, AVPacket *avpkt)
{
    IffContext *s          = avctx->priv_data;
    const uint8_t *buf     = avpkt->data;
    int buf_size           = avpkt->size;
    const uint8_t *buf_end = buf + buf_size;
    int y, plane, res;
    GetByteContext gb0, *const gb = &gb0;
    const AVPixFmtDescriptor *desc;

    bytestream2_init(gb, avpkt->data, avpkt->size);

    if ((res = parse_packet_header(avctx, gb)) < 0)
        return res;

    if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
        return res;

    buf      += bytestream2_tell(gb);
    buf_size -= bytestream2_tell(gb);
    desc = av_pix_fmt_desc_get(avctx->pix_fmt);

    if (!s->init && avctx->bits_per_coded_sample <= 8 - (s->masking == MASK_HAS_MASK) &&
        avctx->pix_fmt == AV_PIX_FMT_PAL8) {
        if ((res = cmap_read_palette(avctx, (uint32_t *)frame->data[1])) < 0)
            return res;
    } else if (!s->init && avctx->bits_per_coded_sample <= 8 &&
               avctx->pix_fmt == AV_PIX_FMT_RGB32) {
        if ((res = cmap_read_palette(avctx, s->mask_palbuf)) < 0)
            return res;
    }
    s->init = 1;

    if (s->compression <= 0xff && (avctx->codec_tag == MKTAG('A', 'N', 'I', 'M'))) {
        if (avctx->pix_fmt == AV_PIX_FMT_PAL8)
            memcpy(s->pal, frame->data[1], 256 * 4);
    }

    switch (s->compression) {
    case 0x0:
        if (avctx->codec_tag == MKTAG('A', 'C', 'B', 'M')) {
            if (avctx->pix_fmt == AV_PIX_FMT_PAL8 || avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
                memset(frame->data[0], 0, avctx->height * frame->linesize[0]);
                for (plane = 0; plane < s->bpp; plane++) {
                    for (y = 0; y < avctx->height && buf < buf_end; y++) {
                        uint8_t *row = &frame->data[0][y * frame->linesize[0]];
                        decodeplane8(row, buf, FFMIN(s->planesize, buf_end - buf), plane);
                        buf += s->planesize;
                    }
                }
            } else if (s->ham) { // HAM to AV_PIX_FMT_BGR32
                memset(frame->data[0], 0, avctx->height * frame->linesize[0]);
                for (y = 0; y < avctx->height; y++) {
                    uint8_t *row = &frame->data[0][y * frame->linesize[0]];
                    memset(s->ham_buf, 0, s->planesize * 8);
                    for (plane = 0; plane < s->bpp; plane++) {
                        const uint8_t * start = buf + (plane * avctx->height + y) * s->planesize;