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

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

1 files changed, 259 insertions, 0 deletions

diff --git a/libavcodec/vda.c b/libavcodec/vda.c
new file mode 100644
index 0000000000..34739f8e0c
--- /dev/null
+++ b/libavcodec/vda.c
@@ -0,0 +1,259 @@
+/*
+ * VDA 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 <pthread.h>
+#include <CoreFoundation/CFDictionary.h>
+#include <CoreFoundation/CFNumber.h>
+#include <CoreFoundation/CFData.h>
+#include <CoreFoundation/CFString.h>
+
+#include "libavutil/avutil.h"
+#include "vda_internal.h"
+
+/* 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 (!user_info)
+        return 0;
+
+    pts = CFDictionaryGetValue(user_info, CFSTR("FF_VDA_DECODER_PTS_KEY"));
+
+    if (pts)
+        CFNumberGetValue(pts, kCFNumberSInt64Type, &outValue);
+
+    return outValue;
+}
+
+/* Remove and release all frames from the queue. */
+static void vda_clear_queue(struct vda_context *vda_ctx)
+{
+    vda_frame *top_frame;
+
+    pthread_mutex_lock(&vda_ctx->queue_mutex);
+
+    while (vda_ctx->queue) {
+        top_frame      = vda_ctx->queue;
+        vda_ctx->queue = top_frame->next_frame;
+        ff_vda_release_vda_frame(top_frame);
+    }
+
+    pthread_mutex_unlock(&vda_ctx->queue_mutex);
+}
+
+/* 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 = vda_hw_ctx;
+    vda_frame *new_frame;
+    vda_frame *queue_walker;
+
+    if (!image_buffer)
+        return;
+
+    if (vda_ctx->cv_pix_fmt_type != CVPixelBufferGetPixelFormatType(image_buffer))
+        return;
+
+    if (!(new_frame = av_mallocz(sizeof(vda_frame))))
+        return;
+    new_frame->next_frame = NULL;
+    new_frame->cv_buffer  = CVPixelBufferRetain(image_buffer);
+    new_frame->pts        = vda_pts_from_dictionary(user_info);
+
+    pthread_mutex_lock(&vda_ctx->queue_mutex);
+
+    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;
+        }
+    }
+
+    pthread_mutex_unlock(&vda_ctx->queue_mutex);
+}
+
+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;
+    CFMutableDictionaryRef buffer_attributes;
+    CFMutableDictionaryRef io_surface_properties;
+    CFNumberRef cv_pix_fmt;
+
+    pthread_mutex_init(&vda_ctx->queue_mutex, NULL);
+
+    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);
+
+    buffer_attributes = CFDictionaryCreateMutable(kCFAllocatorDefault,
+                                                  2,
+                                                  &kCFTypeDictionaryKeyCallBacks,
+                                                  &kCFTypeDictionaryValueCallBacks);
+    io_surface_properties = CFDictionaryCreateMutable(kCFAllocatorDefault,
+                                                      0,
+                                                      &kCFTypeDictionaryKeyCallBacks,
+                                                      &kCFTypeDictionaryValueCallBacks);
+    cv_pix_fmt      = CFNumberCreate(kCFAllocatorDefault,
+                                     kCFNumberSInt32Type,
+                                     &vda_ctx->cv_pix_fmt_type);
+    CFDictionarySetValue(buffer_attributes,
+                         kCVPixelBufferPixelFormatTypeKey,
+                         cv_pix_fmt);
+    CFDictionarySetValue(buffer_attributes,
+                         kCVPixelBufferIOSurfacePropertiesKey,
+                         io_surface_properties);
+
+    status = VDADecoderCreate(config_info,
+                              buffer_attributes,
+                              vda_decoder_callback,
+                              vda_ctx,
+                              &vda_ctx->decoder);
+
+    CFRelease(height);
+    CFRelease(width);
+    CFRelease(format);
+    CFRelease(avc_data);
+    CFRelease(config_info);
+    CFRelease(io_surface_properties);
+    CFRelease(cv_pix_fmt);
+    CFRelease(buffer_attributes);
+
+    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);
+
+    pthread_mutex_destroy(&vda_ctx->queue_mutex);
+
+    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;
+
+    pthread_mutex_lock(&vda_ctx->queue_mutex);
+    top_frame      = vda_ctx->queue;
+    vda_ctx->queue = top_frame->next_frame;
+    pthread_mutex_unlock(&vda_ctx->queue_mutex);
+
+    return top_frame;
+}
+
+void ff_vda_release_vda_frame(vda_frame *frame)
+{
+    if (frame) {
+        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;
+}