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/*
* 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 <CoreFoundation/CFNumber.h>
#include <CoreFoundation/CFData.h>
#include <CoreFoundation/CFString.h>
#include "libavutil/avutil.h"
#include "h264.h"
#include "vda.h"
/* 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;
if (!image_buffer)
return;
if (vda_ctx->cv_pix_fmt_type != CVPixelBufferGetPixelFormatType(image_buffer))
return;
vda_ctx->cv_buffer = CVPixelBufferRetain(image_buffer);
}
static int vda_sync_decode(struct vda_context *vda_ctx)
{
OSStatus status;
CFDataRef coded_frame;
uint32_t flush_flags = 1 << 0; ///< kVDADecoderFlush_emitFrames
coded_frame = CFDataCreate(kCFAllocatorDefault,
vda_ctx->priv_bitstream,
vda_ctx->priv_bitstream_size);
status = VDADecoderDecode(vda_ctx->decoder, 0, coded_frame, NULL);
if (kVDADecoderNoErr == status)
status = VDADecoderFlush(vda_ctx->decoder, flush_flags);
CFRelease(coded_frame);
return status;
}
static int vda_h264_start_frame(AVCodecContext *avctx,
av_unused const uint8_t *buffer,
av_unused uint32_t size)
{
struct vda_context *vda_ctx = avctx->hwaccel_context;
if (!vda_ctx->decoder)
return -1;
vda_ctx->priv_bitstream_size = 0;
return 0;
}
static int vda_h264_decode_slice(AVCodecContext *avctx,
const uint8_t *buffer,
uint32_t size)
{
struct vda_context *vda_ctx = avctx->hwaccel_context;
void *tmp;
if (!vda_ctx->decoder)
return -1;
tmp = av_fast_realloc(vda_ctx->priv_bitstream,
&vda_ctx->priv_allocated_size,
vda_ctx->priv_bitstream_size + size + 4);
if (!tmp)
return AVERROR(ENOMEM);
vda_ctx->priv_bitstream = tmp;
AV_WB32(vda_ctx->priv_bitstream + vda_ctx->priv_bitstream_size, size);
memcpy(vda_ctx->priv_bitstream + vda_ctx->priv_bitstream_size + 4, buffer, size);
vda_ctx->priv_bitstream_size += size + 4;
return 0;
}
static int vda_h264_end_frame(AVCodecContext *avctx)
{
H264Context *h = avctx->priv_data;
struct vda_context *vda_ctx = avctx->hwaccel_context;
AVFrame *frame = &h->cur_pic_ptr->f;
int status;
if (!vda_ctx->decoder || !vda_ctx->priv_bitstream)
return -1;
status = vda_sync_decode(vda_ctx);
frame->data[3] = (void*)vda_ctx->cv_buffer;
if (status)
av_log(avctx, AV_LOG_ERROR, "Failed to decode frame (%d)\n", status);
return status;
}
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;
/* Each VCL NAL in the bistream sent to the decoder
* is preceded 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,
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);
return status;
}
int ff_vda_destroy_decoder(struct vda_context *vda_ctx)
{
OSStatus status = kVDADecoderNoErr;
if (vda_ctx->decoder)
status = VDADecoderDestroy(vda_ctx->decoder);
av_freep(&vda_ctx->priv_bitstream);
return status;
}
AVHWAccel ff_h264_vda_hwaccel = {
.name = "h264_vda",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_H264,
.pix_fmt = AV_PIX_FMT_VDA_VLD,
.start_frame = vda_h264_start_frame,
.decode_slice = vda_h264_decode_slice,
.end_frame = vda_h264_end_frame,
};
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