Function decode_frame

libavcodec/prores_raw.c:322–516

}

static int decode_frame(AVCodecContext *avctx,
                        AVFrame *frame, int *got_frame_ptr,
                        AVPacket *avpkt)
{
    ProResRAWContext *s = avctx->priv_data;
    int ret, dimensions_changed = 0, old_version = s->version;
    DECLARE_ALIGNED(32, uint8_t, qmat)[64];
    memset(qmat, 1, 64);

    if (avctx->skip_frame >= AVDISCARD_ALL)
        return avpkt->size;

    switch (avctx->codec_tag) {
    case 0:
        break;
    case MKTAG('a','p','r','n'):
        avctx->profile = AV_PROFILE_PRORES_RAW;
        break;
    case MKTAG('a','p','r','h'):
        avctx->profile = AV_PROFILE_PRORES_RAW_HQ;
        break;
    default:
        avpriv_request_sample(avctx, "Profile %d", avctx->codec_tag);
        return AVERROR_PATCHWELCOME;
        break;
    }

    GetByteContext gb;
    bytestream2_init(&gb, avpkt->data, avpkt->size);
    if (bytestream2_get_be32(&gb) != avpkt->size)
        return AVERROR_INVALIDDATA;

    /* ProRes RAW frame */
    if (bytestream2_get_be32(&gb) != MKBETAG('p','r','r','f'))
        return AVERROR_INVALIDDATA;

    int header_len = bytestream2_get_be16(&gb);
    if (header_len < 62 || bytestream2_get_bytes_left(&gb) < header_len - 2)
        return AVERROR_INVALIDDATA;

    GetByteContext gb_hdr;
    bytestream2_init(&gb_hdr, gb.buffer, header_len - 2);
    bytestream2_skip(&gb, header_len - 2);

    bytestream2_skip(&gb_hdr, 1);
    s->version = bytestream2_get_byte(&gb_hdr);
    if (s->version > 1) {
        avpriv_request_sample(avctx, "Version %d", s->version);
        return AVERROR_PATCHWELCOME;
    }

    /* Vendor header (e.g. "peac" for Panasonic or "atm0" for Atmos) */
    bytestream2_skip(&gb_hdr, 4);

    /* Width and height must always be even */
    int w = bytestream2_get_be16(&gb_hdr);
    int h = bytestream2_get_be16(&gb_hdr);
    if ((w & 1) || (h & 1))