static int rl2_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
Rl2Context *s = avctx->priv_data;
if(s->frame.data[0])
avctx->release_buffer(avctx, &s->frame);
/** get buffer */
s->frame.reference= 0;
if(avctx->get_buffer(avctx, &s->frame)) {
av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
/** run length decode */
rl2_rle_decode(s,buf,buf_size,s->frame.data[0],s->frame.linesize[0],s->video_base);
/** make the palette available on the way out */
memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
*data_size = sizeof(AVFrame);
*(AVFrame*)data = s->frame;
/** report that the buffer was completely consumed */
return buf_size;
}
/**
* Initialize the decoder
* @param avctx decoder context
* @return 0 success, -1 on error
*/
static av_cold int rl2_decode_init(AVCodecContext *avctx)
{
Rl2Context *s = avctx->priv_data;
int back_size;
int i;
s->avctx = avctx;
avctx->pix_fmt = PIX_FMT_PAL8;
/** parse extra data */
if(!avctx->extradata || avctx->extradata_size < EXTRADATA1_SIZE)
{
av_log(avctx, AV_LOG_ERROR, "invalid extradata size\n");
return -1;
}
/** get frame_offset */
s->video_base = AV_RL16(&avctx->extradata[0]);
s->clr_count = AV_RL32(&avctx->extradata[2]);
if(s->video_base >= avctx->width * avctx->height)
{
av_log(avctx, AV_LOG_ERROR, "invalid video_base\n");
return -1;
}
/** initialize palette */
for(i=0; i<AVPALETTE_COUNT; i++)
s->palette[i] = AV_RB24(&avctx->extradata[6 + i * 3]);
/** decode background frame if present */
back_size = avctx->extradata_size - EXTRADATA1_SIZE;
if(back_size > 0)
{
unsigned char* back_frame = av_mallocz(avctx->width*avctx->height);
if(!back_frame)
return -1;
rl2_rle_decode(s,avctx->extradata + EXTRADATA1_SIZE,back_size,
back_frame,avctx->width,0);
s->back_frame = back_frame;
}
return 0;
}