+static AVHWAccel *find_hwaccel(enum AVCodecID codec_id,
+ enum AVPixelFormat pix_fmt)
+{
+ AVHWAccel *hwaccel = NULL;
+
+ while ((hwaccel = av_hwaccel_next(hwaccel)))
+ if (hwaccel->id == codec_id
+ && hwaccel->pix_fmt == pix_fmt)
+ return hwaccel;
+ return NULL;
+}
+
+
+int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
+{
+ const AVPixFmtDescriptor *desc;
+ enum AVPixelFormat ret = avctx->get_format(avctx, fmt);
+
+ desc = av_pix_fmt_desc_get(ret);
+ if (!desc)
+ return AV_PIX_FMT_NONE;
+
+ if (avctx->hwaccel && avctx->hwaccel->uninit)
+ avctx->hwaccel->uninit(avctx);
+ av_freep(&avctx->internal->hwaccel_priv_data);
+ avctx->hwaccel = NULL;
+
+ if (desc->flags & AV_PIX_FMT_FLAG_HWACCEL) {
+ AVHWAccel *hwaccel;
+ int err;
+
+ hwaccel = find_hwaccel(avctx->codec_id, ret);
+ if (!hwaccel) {
+ av_log(avctx, AV_LOG_ERROR,
+ "Could not find an AVHWAccel for the pixel format: %s",
+ desc->name);
+ return AV_PIX_FMT_NONE;
+ }
+
+ if (hwaccel->priv_data_size) {
+ avctx->internal->hwaccel_priv_data = av_mallocz(hwaccel->priv_data_size);
+ if (!avctx->internal->hwaccel_priv_data)
+ return AV_PIX_FMT_NONE;
+ }
+
+ if (hwaccel->init) {
+ err = hwaccel->init(avctx);
+ if (err < 0) {
+ av_freep(&avctx->internal->hwaccel_priv_data);
+ return AV_PIX_FMT_NONE;
+ }
+ }
+ avctx->hwaccel = hwaccel;
+ }
+
+ return ret;
+}
+