hwaccel: OS X Video Decoder Acceleration (VDA) support.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

1 files changed, 110 insertions, 0 deletions

diff --git a/libavcodec/vda_h264.c b/libavcodec/vda_h264.c
new file mode 100644
index 0000000000..c9022673fc
--- /dev/null
+++ b/libavcodec/vda_h264.c
@@ -0,0 +1,110 @@
+/*
+ * VDA H.264 hardware acceleration
+ *
+ * copyright (c) 2011 Sebastien Zwickert
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "h264.h"
+#include "h264data.h"
+
+#include "vda_internal.h"
+
+/* This structure is used to store the bitstream of the current frame. */
+struct vda_picture_context {
+    uint8_t *bitstream;
+    int      bitstream_size;
+};
+
+static int start_frame(AVCodecContext *avctx,
+                       av_unused const uint8_t *buffer,
+                       av_unused uint32_t size)
+{
+    const H264Context *h                = avctx->priv_data;
+    struct vda_context *vda_ctx         = avctx->hwaccel_context;
+    struct vda_picture_context *pic_ctx = h->s.current_picture_ptr->f.hwaccel_picture_private;
+
+    if (!vda_ctx->decoder)
+        return -1;
+
+    pic_ctx->bitstream      = NULL;
+    pic_ctx->bitstream_size = 0;
+
+    return 0;
+}
+
+static int decode_slice(AVCodecContext *avctx,
+                        const uint8_t *buffer,
+                        uint32_t size)
+{
+    H264Context *h                      = avctx->priv_data;
+    struct vda_context *vda_ctx         = avctx->hwaccel_context;
+    struct vda_picture_context *pic_ctx = h->s.current_picture_ptr->f.hwaccel_picture_private;
+    void *tmp;
+
+    if (!vda_ctx->decoder)
+        return -1;
+
+    tmp = av_realloc(pic_ctx->bitstream, pic_ctx->bitstream_size+size+4);
+    if (!tmp)
+        return AVERROR(ENOMEM);
+
+    pic_ctx->bitstream = tmp;
+
+    AV_WB32(pic_ctx->bitstream + pic_ctx->bitstream_size, size);
+    memcpy(pic_ctx->bitstream + pic_ctx->bitstream_size + 4, buffer, size);
+
+    pic_ctx->bitstream_size += size + 4;
+
+    return 0;
+}
+
+static int end_frame(AVCodecContext *avctx)
+{
+    H264Context *h                      = avctx->priv_data;
+    struct vda_context *vda_ctx         = avctx->hwaccel_context;
+    struct vda_picture_context *pic_ctx = h->s.current_picture_ptr->f.hwaccel_picture_private;
+    AVFrame *frame                      = &h->s.current_picture_ptr->f;
+    int status;
+
+    if (!vda_ctx->decoder || !pic_ctx->bitstream)
+        return -1;
+
+    status = ff_vda_decoder_decode(vda_ctx, pic_ctx->bitstream,
+                                   pic_ctx->bitstream_size,
+                                   frame->reordered_opaque);
+
+    if (status)
+        av_log(avctx, AV_LOG_ERROR, "Failed to decode frame (%d)\n", status);
+
+    av_freep(&pic_ctx->bitstream);
+
+    return status;
+}
+
+AVHWAccel ff_h264_vda_hwaccel = {
+    .name           = "h264_vda",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = CODEC_ID_H264,
+    .pix_fmt        = PIX_FMT_VDA_VLD,
+    .capabilities   = 0,
+    .start_frame    = start_frame,
+    .decode_slice   = decode_slice,
+    .end_frame      = end_frame,
+    .priv_data_size = sizeof(struct vda_picture_context),
+};