HWAccel: adds Video Decoder Acceleration (VDA) module for Mac OS X.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 271 insertions, 0 deletions

diff --git a/libavcodec/vda.c b/libavcodec/vda.c
new file mode 100644
index 0000000000..5fe8a48fa4
--- /dev/null
+++ b/libavcodec/vda.c
@@ -0,0 +1,271 @@
+/*
+ * VDA HW acceleration.
+ *
+ * copyright (c) 2011 Sebastien Zwickert
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "vda_internal.h"
+
+/**
+ * \addtogroup VDA_Decoding
+ *
+ * @{
+ */
+
+/* Mutex manager callback. */
+static int vda_lock_operation(void **mtx, enum AVLockOp op)
+{
+    switch(op)
+    {
+        case AV_LOCK_CREATE:
+            *mtx = av_malloc(sizeof(pthread_mutex_t));
+            if(!*mtx)
+                return 1;
+            return !!pthread_mutex_init(*mtx, NULL);
+        case AV_LOCK_OBTAIN:
+            return !!pthread_mutex_lock(*mtx);
+        case AV_LOCK_RELEASE:
+            return !!pthread_mutex_unlock(*mtx);
+        case AV_LOCK_DESTROY:
+            pthread_mutex_destroy(*mtx);
+            av_freep(mtx);
+            return 0;
+    }
+    return 1;
+}
+
+/* Helper to create a dictionary according to the given pts. */
+static CFDictionaryRef vda_dictionary_with_pts(int64_t i_pts)
+{
+    CFStringRef key = CFSTR("FF_VDA_DECODER_PTS_KEY");
+    CFNumberRef value = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt64Type, &i_pts);
+    CFDictionaryRef user_info = CFDictionaryCreate( kCFAllocatorDefault,
+                                                    (const void **)&key,
+                                                    (const void **)&value,
+                                                    1,
+                                                    &kCFTypeDictionaryKeyCallBacks,
+                                                    &kCFTypeDictionaryValueCallBacks);
+    CFRelease(value);
+    return user_info;
+}
+
+/* Helper to retrieve the pts from the given dictionary. */
+static int64_t vda_pts_from_dictionary(CFDictionaryRef user_info)
+{
+    CFNumberRef pts;
+    int64_t outValue = 0;
+
+    if (NULL == user_info)
+        return 0;
+
+    pts = CFDictionaryGetValue(user_info, CFSTR("FF_VDA_DECODER_PTS_KEY"));
+
+    if (pts)
+        CFNumberGetValue(pts, kCFNumberSInt64Type, &outValue);
+
+    return outValue;
+}
+
+/* Removes and releases all frames from the queue. */
+static void vda_clear_queue(struct vda_context *vda_ctx)
+{
+    vda_frame *top_frame;
+
+    vda_lock_operation(&vda_ctx->queue_mutex, AV_LOCK_OBTAIN);
+
+    while (vda_ctx->queue != NULL)
+    {
+        top_frame = vda_ctx->queue;
+        vda_ctx->queue = top_frame->next_frame;
+        ff_vda_release_vda_frame(top_frame);
+    }
+
+    vda_lock_operation(&vda_ctx->queue_mutex, AV_LOCK_RELEASE);
+}
+
+
+/* Decoder callback that adds the vda frame to the queue in display order. */
+static void vda_decoder_callback (void *vda_hw_ctx,
+                                  CFDictionaryRef user_info,
+                                  OSStatus status,
+                                  uint32_t infoFlags,
+                                  CVImageBufferRef image_buffer)
+{
+    struct vda_context *vda_ctx = (struct vda_context*)vda_hw_ctx;
+    vda_frame *new_frame;
+    vda_frame *queue_walker;
+
+    if (NULL == image_buffer)
+        return;
+
+    if (kCVPixelFormatType_422YpCbCr8 != CVPixelBufferGetPixelFormatType(image_buffer))
+        return;
+
+    new_frame = (vda_frame *)av_mallocz(sizeof(vda_frame));
+    new_frame->next_frame = NULL;
+    new_frame->cv_buffer = CVPixelBufferRetain(image_buffer);
+    new_frame->pts = vda_pts_from_dictionary(user_info);
+
+    vda_lock_operation(&vda_ctx->queue_mutex, AV_LOCK_OBTAIN);
+
+    queue_walker = vda_ctx->queue;
+
+    if (!queue_walker || (new_frame->pts < queue_walker->pts))
+    {
+        /* we have an empty queue, or this frame earlier than the current queue head */
+        new_frame->next_frame = queue_walker;
+        vda_ctx->queue = new_frame;
+    }
+    else
+    {
+        /* walk the queue and insert this frame where it belongs in display order */
+        vda_frame *next_frame;
+
+        while (1)
+        {
+            next_frame = queue_walker->next_frame;
+
+            if (!next_frame || (new_frame->pts < next_frame->pts))
+            {
+                new_frame->next_frame = next_frame;
+                queue_walker->next_frame = new_frame;
+                break;
+            }
+            queue_walker = next_frame;
+        }
+    }
+
+    vda_lock_operation(&vda_ctx->queue_mutex, AV_LOCK_RELEASE);
+}
+
+int ff_vda_create_decoder(struct vda_context *vda_ctx,
+                          uint8_t *extradata,
+                          int extradata_size)
+{
+    OSStatus status = kVDADecoderNoErr;
+    CFNumberRef height;
+    CFNumberRef width;
+    CFNumberRef format;
+    CFDataRef avc_data;
+    CFMutableDictionaryRef config_info;
+
+    if (av_lockmgr_register(vda_lock_operation))
+        return -1;
+
+    vda_lock_operation(&vda_ctx->queue_mutex, AV_LOCK_CREATE);
+
+    config_info = (CFDictionaryCreateMutable(kCFAllocatorDefault,
+                                             4,
+                                             &kCFTypeDictionaryKeyCallBacks,
+                                             &kCFTypeDictionaryValueCallBacks));
+
+    height = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->height);
+    width = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->width);
+    format = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->format);
+    avc_data = CFDataCreate(kCFAllocatorDefault, extradata, extradata_size);
+
+    CFDictionarySetValue(config_info, kVDADecoderConfiguration_Height, height);
+    CFDictionarySetValue(config_info, kVDADecoderConfiguration_Width, width);
+    CFDictionarySetValue(config_info, kVDADecoderConfiguration_SourceFormat, format);
+    CFDictionarySetValue(config_info, kVDADecoderConfiguration_avcCData, avc_data);
+
+    status = VDADecoderCreate( config_info,
+                               NULL,
+                               (VDADecoderOutputCallback *)vda_decoder_callback,
+                               (void *)vda_ctx,
+                               &vda_ctx->decoder );
+
+    CFRelease(height);
+    CFRelease(width);
+    CFRelease(format);
+    CFRelease(avc_data);
+    CFRelease(config_info);
+
+    if (kVDADecoderNoErr != status)
+        return status;
+
+    return 0;
+}
+
+int ff_vda_destroy_decoder(struct vda_context *vda_ctx)
+{
+    OSStatus status = kVDADecoderNoErr;
+
+    if (vda_ctx->decoder)
+        status = VDADecoderDestroy(vda_ctx->decoder);
+
+    vda_clear_queue(vda_ctx);
+
+    if (vda_ctx->queue_mutex != NULL)
+        vda_lock_operation(&vda_ctx->queue_mutex, AV_LOCK_DESTROY);
+
+    if (kVDADecoderNoErr != status)
+        return status;
+
+    return 0;
+}
+
+vda_frame *ff_vda_queue_pop(struct vda_context *vda_ctx)
+{
+    vda_frame *top_frame;
+
+    if (!vda_ctx->queue)
+        return NULL;
+
+    vda_lock_operation(&vda_ctx->queue_mutex, AV_LOCK_OBTAIN);
+    top_frame = vda_ctx->queue;
+    vda_ctx->queue = top_frame->next_frame;
+    vda_lock_operation(&vda_ctx->queue_mutex, AV_LOCK_RELEASE);
+
+    return top_frame;
+}
+
+void ff_vda_release_vda_frame(vda_frame *frame)
+{
+    if (frame != NULL)
+    {
+        CVPixelBufferRelease(frame->cv_buffer);
+        av_freep(&frame);
+    }
+}
+
+int ff_vda_decoder_decode(struct vda_context *vda_ctx,
+                          uint8_t *bitstream,
+                          int bitstream_size,
+                          int64_t frame_pts)
+{
+    OSStatus status = kVDADecoderNoErr;
+    CFDictionaryRef user_info;
+    CFDataRef coded_frame;
+
+    coded_frame = CFDataCreate(kCFAllocatorDefault, bitstream, bitstream_size);
+    user_info = vda_dictionary_with_pts(frame_pts);
+
+    status = VDADecoderDecode(vda_ctx->decoder, 0, coded_frame, user_info);
+
+    CFRelease(user_info);
+    CFRelease(coded_frame);
+
+    if (kVDADecoderNoErr != status)
+        return status;
+
+    return 0;
+}
+
+/* @} */