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ffmpeg/libavcodec/vda.c

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/*
* 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 <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;
}
/* Removes and releases 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 = (struct vda_context*)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;
new_frame = av_mallocz(sizeof(vda_frame));
if (!new_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;
vda_ctx->bitstream = NULL;
vda_ctx->ref_size = 0;
pthread_mutex_init(&vda_ctx->queue_mutex, NULL);
/* Each VCL NAL in the bistream sent to the decoder
* is preceeded by a 4 bytes length header.
* Change the avcC atom header if needed, to signal headers of 4 bytes. */
if (extradata_size >= 4 && (extradata[4] & 0x03) != 0x03) {
uint8_t *rw_extradata;
if (!(rw_extradata = av_malloc(extradata_size)))
return AVERROR(ENOMEM);
memcpy(rw_extradata, extradata, extradata_size);
rw_extradata[4] |= 0x03;
avc_data = CFDataCreate(kCFAllocatorDefault, rw_extradata, extradata_size);
av_freep(&rw_extradata);
} else {
avc_data = CFDataCreate(kCFAllocatorDefault, extradata, extradata_size);
}
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);
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,
(VDADecoderOutputCallback *)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 (vda_ctx->bitstream)
av_freep(&vda_ctx->bitstream);
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;
}
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