static int yop_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt) { YopDecContext *s = avctx->priv_data; int tag, firstcolor, is_odd_frame; int ret, i, x, y; uint32_t *palette; if (s->frame.data[0]) avctx->release_buffer(avctx, &s->frame); ret = ff_get_buffer(avctx, &s->frame); if (ret < 0) { av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return ret; } s->dstbuf = s->frame.data[0]; s->dstptr = s->frame.data[0]; s->srcptr = avpkt->data + 4; s->low_nibble = NULL; is_odd_frame = avpkt->data[0]; 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); s->frame.palette_has_changed = 1; for (y = 0; y < avctx->height; y += 2) { for (x = 0; x < avctx->width; x += 2) { if (s->srcptr - avpkt->data >= avpkt->size) { av_log(avctx, AV_LOG_ERROR, "Packet too small.\n"); return AVERROR_INVALIDDATA; } 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; } } s->dstptr += 2; } s->dstptr += 2*s->frame.linesize[0] - x; } *got_frame = 1; *(AVFrame *) data = s->frame; return avpkt->size; }