On 09/12/11 11:07, Kostya Shishkov wrote:
+static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
+ AVPacket *avpkt)
+{
+ int h, w;
+ AVFrame *pic = avctx->coded_frame;
+ const uint8_t* src = avpkt->data;
uint8_t *src
+ uint8_t *Y1, *Y2, *U, *V;
+ int ret;
+
+ if (pic->data[0])
+ avctx->release_buffer(avctx, pic);
+
+ if (avpkt->size< avctx->width * avctx->height * 3 / 2 + 16) {
+ av_log(avctx, AV_LOG_ERROR, "packet too small\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ pic->reference = 0;
+ if ((ret = avctx->get_buffer(avctx, pic))< 0)
+ return ret;
+
+ pic->pict_type = AV_PICTURE_TYPE_I;
+ pic->key_frame = 1;
+
+ if (AV_RL32(src) != 0x01000002) {
+ av_log_ask_for_sample(avctx, "Unknown frame header %X\n",
AV_RL32(src));
+ return AVERROR_PATCHWELCOME;
+ }
+ src += 16;
+
+ Y1 = pic->data[0];
+ Y2 = pic->data[0] + pic->linesize[0];
+ U = pic->data[1];
+ V = pic->data[2];
+ for (h = 0; h< avctx->height; h += 2) {
+ for (w = 0; w< avctx->width; w += 2) {
+ AV_WN16A(Y1 + w, AV_RN16A(src));
+ AV_WN16A(Y2 + w, AV_RN16A(src + 2));
+ U[w>> 1] = src[4] + 0x80;
+ V[w>> 1] = src[5] + 0x80;
+ src += 6;
+ }
+ Y1 += pic->linesize[0]<< 1;
+ Y2 += pic->linesize[0]<< 1;
+ U += pic->linesize[1];
+ V += pic->linesize[2];
+ }
+
+ *data_size = sizeof(AVFrame);
+ *(AVFrame*)data = *avctx->coded_frame;
Uhm...
--
Luca Barbato
Gentoo/linux
http://dev.gentoo.org/~lu_zero
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