/*
* Copyright (c) 2012, Xidorn Quan
*
* 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
*/
/**
* @file
* H.264 decoder via VDA
* @author Xidorn Quan <quanxunzhen@gmail.com>
*/
#include <string.h>
#include <CoreFoundation/CoreFoundation.h>
#include "vda.h"
#include "h264.h"
#include "avcodec.h"
#ifndef kCFCoreFoundationVersionNumber10_7
#define kCFCoreFoundationVersionNumber10_7 635.00
#endif
extern AVCodec ff_h264_decoder, ff_h264_vda_decoder;
static const enum AVPixelFormat vda_pixfmts_prior_10_7[] = {
AV_PIX_FMT_UYVY422,
AV_PIX_FMT_YUV420P,
AV_PIX_FMT_NONE
};
static const enum AVPixelFormat vda_pixfmts[] = {
AV_PIX_FMT_UYVY422,
AV_PIX_FMT_YUYV422,
AV_PIX_FMT_NV12,
AV_PIX_FMT_YUV420P,
AV_PIX_FMT_NONE
};
typedef struct {
H264Context h264ctx;
int h264_initialized;
struct vda_context vda_ctx;
enum AVPixelFormat pix_fmt;
} VDADecoderContext;
static enum AVPixelFormat get_format(struct AVCodecContext *avctx,
const enum AVPixelFormat *fmt)
{
return AV_PIX_FMT_VDA_VLD;
}
typedef struct {
CVPixelBufferRef cv_buffer;
} VDABufferContext;
static void release_buffer(void *opaque, uint8_t *data)
{
VDABufferContext *context = opaque;
CVPixelBufferUnlockBaseAddress(context->cv_buffer, 0);
CVPixelBufferRelease(context->cv_buffer);
av_free(context);
}
static int get_buffer2(AVCodecContext *avctx, AVFrame *pic, int flag)
{
VDABufferContext *context = av_mallocz(sizeof(VDABufferContext));
AVBufferRef *buffer = av_buffer_create(NULL, 0, release_buffer, context, 0);
if (!context || !buffer) {
av_free(context);
return AVERROR(ENOMEM);
}
pic->buf[0] = buffer;
pic->data[0] = (void *)1;
return 0;
}
static int vdadec_decode(AVCodecContext *avctx,
void *data, int *got_frame, AVPacket *avpkt)
{
VDADecoderContext *ctx = avctx->priv_data;
AVFrame *pic = data;
int ret;
ret = ff_h264_decoder.decode(avctx, data, got_frame, avpkt);
if (*got_frame) {
AVBufferRef *buffer = pic->buf[0];
VDABufferContext *context = av_buffer_get_opaque(buffer);
CVPixelBufferRef cv_buffer = (CVPixelBufferRef)pic->data[3];
CVPixelBufferRetain(cv_buffer);
CVPixelBufferLockBaseAddress(cv_buffer, 0);
context->cv_buffer = cv_buffer;
pic->format = ctx->pix_fmt;
if (CVPixelBufferIsPlanar(cv_buffer)) {
int i, count = CVPixelBufferGetPlaneCount(cv_buffer);
av_assert0(count < 4);
for (i = 0; i < count; i++) {
pic->data[i] = CVPixelBufferGetBaseAddressOfPlane(cv_buffer, i);
pic->linesize[i] = CVPixelBufferGetBytesPerRowOfPlane(cv_buffer, i);
}
} else {
pic->data[0] = CVPixelBufferGetBaseAddress(cv_buffer);
pic->linesize[0] = CVPixelBufferGetBytesPerRow(cv_buffer);
}
}
avctx->pix_fmt = ctx->pix_fmt;
return ret;
}
static av_cold int vdadec_close(AVCodecContext *avctx)
{
VDADecoderContext *ctx = avctx->priv_data;
/* release buffers and decoder */
ff_vda_destroy_decoder(&ctx->vda_ctx);
/* close H.264 decoder */
if (ctx->h264_initialized)
ff_h264_decoder.close(avctx);
return 0;
}
static av_cold int vdadec_init(AVCodecContext *avctx)
{
VDADecoderContext *ctx = avctx->priv_data;
struct vda_context *vda_ctx = &ctx->vda_ctx;
OSStatus status;
int ret;
ctx->h264_initialized = 0;
/* init pix_fmts of codec */
if (!ff_h264_vda_decoder.pix_fmts) {
if (kCFCoreFoundationVersionNumber < kCFCoreFoundationVersionNumber10_7)
ff_h264_vda_decoder.pix_fmts = vda_pixfmts_prior_10_7;
else
ff_h264_vda_decoder.pix_fmts = vda_pixfmts;
}
/* init vda */
memset(vda_ctx
, 0, sizeof(struct vda_context
)); vda_ctx->width = avctx->width;
vda_ctx->height = avctx->height;
vda_ctx->format = 'avc1';
vda_ctx->use_sync_decoding = 1;
vda_ctx->use_ref_buffer = 1;
ctx->pix_fmt = avctx->get_format(avctx, avctx->codec->pix_fmts);
switch (ctx->pix_fmt) {
case AV_PIX_FMT_UYVY422:
vda_ctx->cv_pix_fmt_type = '2vuy';
break;
case AV_PIX_FMT_YUYV422:
vda_ctx->cv_pix_fmt_type = 'yuvs';
break;
case AV_PIX_FMT_NV12:
vda_ctx->cv_pix_fmt_type = '420v';
break;
case AV_PIX_FMT_YUV420P:
vda_ctx->cv_pix_fmt_type = 'y420';
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format: %d\n", avctx->pix_fmt);
goto failed;
}
status = ff_vda_create_decoder(vda_ctx,
avctx->extradata, avctx->extradata_size);
if (status != kVDADecoderNoErr) {
av_log(avctx, AV_LOG_ERROR,
"Failed to init VDA decoder: %d.\n", status);
goto failed;
}
avctx->hwaccel_context = vda_ctx;
/* changes callback functions */
avctx->get_format = get_format;
avctx->get_buffer2 = get_buffer2;
#if FF_API_GET_BUFFER
// force the old get_buffer to be empty
avctx->get_buffer = NULL;
#endif
/* init H.264 decoder */
ret = ff_h264_decoder.init(avctx);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Failed to open H.264 decoder.\n");
goto failed;
}
ctx->h264_initialized = 1;
return 0;
failed:
vdadec_close(avctx);
return -1;
}
static void vdadec_flush(AVCodecContext *avctx)
{
return ff_h264_decoder.flush(avctx);
}
AVCodec ff_h264_vda_decoder = {
.name = "h264_vda",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_H264,
.priv_data_size = sizeof(VDADecoderContext),
.init = vdadec_init,
.close = vdadec_close,
.decode = vdadec_decode,
.capabilities = CODEC_CAP_DELAY,
.flush = vdadec_flush,
.long_name = NULL_IF_CONFIG_SMALL("H.264 (VDA acceleration)"),
};