static int yop_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) { YopDecContext *s = avctx->priv_data; int tag, firstcolor, is_odd_frame; int ret, i; uint32_t *palette; if (s->frame.data[0]) avctx->release_buffer(avctx, &s->frame); if (avpkt->size < 4 + 3*s->num_pal_colors) { av_log(avctx, AV_LOG_ERROR, "packet of size %d too small\n", avpkt->size); return AVERROR_INVALIDDATA; } ret = avctx->get_buffer(avctx, &s->frame); if (ret < 0) { av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return ret; } s->frame.linesize[0] = avctx->width; s->dstbuf = s->frame.data[0]; s->dstptr = s->frame.data[0]; s->srcptr = avpkt->data + 4; s->row_pos = 0; s->low_nibble = NULL; is_odd_frame = avpkt->data[0]; if(is_odd_frame>1){ av_log(avctx, AV_LOG_ERROR, "frame is too odd %d\n", is_odd_frame); return AVERROR_INVALIDDATA; } firstcolor = s->first_color[is_odd_frame]; palette = (uint32_t *)s->frame.data[1]; for (i = 0; i < s->num_pal_colors; i++, s->srcptr += 3) { palette[i + firstcolor] = (s->srcptr[0] << 18) | (s->srcptr[1] << 10) | (s->srcptr[2] << 2); palette[i + firstcolor] |= 0xFF << 24 | (palette[i + firstcolor] >> 6) & 0x30303; } s->frame.palette_has_changed = 1; while (s->dstptr - s->dstbuf < avctx->width * avctx->height && s->srcptr - avpkt->data < avpkt->size) { tag = yop_get_next_nibble(s); if (tag != 0xf) { yop_paint_block(s, tag); }else { tag = yop_get_next_nibble(s); ret = yop_copy_previous_block(s, tag); if (ret < 0) { avctx->release_buffer(avctx, &s->frame); return ret; } } yop_next_macroblock(s); } *data_size = sizeof(AVFrame); *(AVFrame *) data = s->frame; return avpkt->size; }