static int ptx_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; PTXContext * const s = avctx->priv_data; AVFrame *picture = data; AVFrame * const p = &s->picture; unsigned int offset, w, h, y, stride, bytes_per_pixel; uint8_t *ptr; offset = AV_RL16(buf); w = AV_RL16(buf+8); h = AV_RL16(buf+10); bytes_per_pixel = AV_RL16(buf+12) >> 3; if (bytes_per_pixel != 2) { av_log_ask_for_sample(avctx, "Image format is not RGB15.\n"); return -1; } avctx->pix_fmt = PIX_FMT_RGB555; if (buf_end - buf < offset) if (offset != 0x2c) av_log_ask_for_sample(avctx, "offset != 0x2c\n"); buf += offset; if (p->data[0]) avctx->release_buffer(avctx, p); if (av_image_check_size(w, h, 0, avctx)) return -1; if (w != avctx->width || h != avctx->height) avcodec_set_dimensions(avctx, w, h); if (avctx->get_buffer(avctx, p) < 0) { av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return -1; } p->pict_type = AV_PICTURE_TYPE_I; ptr = p->data[0]; stride = p->linesize[0]; for (y=0; y<h; y++) { if (buf_end - buf < w * bytes_per_pixel) break; #if HAVE_BIGENDIAN unsigned int x; for (x=0; x<w*bytes_per_pixel; x+=bytes_per_pixel) AV_WN16(ptr+x, AV_RL16(buf+x)); #else memcpy(ptr, buf, w*bytes_per_pixel); #endif ptr += stride; buf += w*bytes_per_pixel; } *picture = s->picture; *data_size = sizeof(AVPicture); return offset + w*h*bytes_per_pixel; }