static int zero12v_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt) { int line = 0, ret; const int width = avctx->width; AVFrame *pic = data; uint16_t *y, *u, *v; const uint8_t *line_end, *src = avpkt->data; int stride = avctx->width * 8 / 3; if (width == 1) { av_log(avctx, AV_LOG_ERROR, "Width 1 not supported.\n"); return AVERROR_INVALIDDATA; } if ( avctx->codec_tag == MKTAG('0', '1', '2', 'v') && avpkt->size % avctx->height == 0 && avpkt->size / avctx->height * 3 >= width * 8) stride = avpkt->size / avctx->height; if (avpkt->size < avctx->height * stride) { av_log(avctx, AV_LOG_ERROR, "Packet too small: %d instead of %d\n", avpkt->size, avctx->height * stride); return AVERROR_INVALIDDATA; } if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) return ret; pic->pict_type = AV_PICTURE_TYPE_I; pic->key_frame = 1; y = (uint16_t *)pic->data[0]; u = (uint16_t *)pic->data[1]; v = (uint16_t *)pic->data[2]; line_end = avpkt->data + stride; while (line++ < avctx->height) { while (1) { uint32_t t = AV_RL32(src); src += 4; *u++ = t << 6 & 0xFFC0; *y++ = t >> 4 & 0xFFC0; *v++ = t >> 14 & 0xFFC0; if (src >= line_end - 1) { *y = 0x80; src++; line_end += stride; y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]); u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]); v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]); break; } t = AV_RL32(src); src += 4; *y++ = t << 6 & 0xFFC0; *u++ = t >> 4 & 0xFFC0; *y++ = t >> 14 & 0xFFC0; if (src >= line_end - 2) { if (!(width & 1)) { *y = 0x80; src += 2; } line_end += stride; y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]); u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]); v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]); break; } t = AV_RL32(src); src += 4; *v++ = t << 6 & 0xFFC0; *y++ = t >> 4 & 0xFFC0; *u++ = t >> 14 & 0xFFC0; if (src >= line_end - 1) { *y = 0x80; src++; line_end += stride; y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]); u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]); v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]); break; } t = AV_RL32(src); src += 4; *y++ = t << 6 & 0xFFC0; *v++ = t >> 4 & 0xFFC0; *y++ = t >> 14 & 0xFFC0; if (src >= line_end - 2) { if (width & 1) { *y = 0x80; src += 2; } line_end += stride; y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]); u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]); v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]); break; } } } *got_frame = 1; return avpkt->size; }