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/*
* 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 PixelFormat vda_pixfmts_prior_10_7[] = {
PIX_FMT_UYVY422,
PIX_FMT_YUV420P,
PIX_FMT_NONE
};
static const enum PixelFormat vda_pixfmts[] = {
PIX_FMT_UYVY422,
PIX_FMT_YUYV422,
PIX_FMT_NV12,
PIX_FMT_YUV420P,
PIX_FMT_NONE
};
typedef struct {
H264Context h264ctx;
int h264_initialized;
struct vda_context vda_ctx;
enum PixelFormat pix_fmt;
} VDADecoderContext;
static enum PixelFormat get_format(struct AVCodecContext *avctx,
const enum PixelFormat *fmt)
{
return PIX_FMT_VDA_VLD;
}
static int get_buffer(AVCodecContext *avctx, AVFrame *pic)
{
pic->type = FF_BUFFER_TYPE_USER;
pic->data[0] = (void *)1;
return 0;
}
static void release_buffer(AVCodecContext *avctx, AVFrame *pic)
{
int i;
CVPixelBufferRef cv_buffer = (CVPixelBufferRef)pic->data[3];
CVPixelBufferUnlockBaseAddress(cv_buffer, 0);
CVPixelBufferRelease(cv_buffer);
for (i = 0; i < 4; i++)
pic->data[i] = NULL;
}
static int vdadec_decode(AVCodecContext *avctx,
void *data, int *data_size, AVPacket *avpkt)
{
VDADecoderContext *ctx = avctx->priv_data;
AVFrame *pic = data;
int ret;
ret = ff_h264_decoder.decode(avctx, data, data_size, avpkt);
if (*data_size) {
CVPixelBufferRef cv_buffer = (CVPixelBufferRef)pic->data[3];
CVPixelBufferLockBaseAddress(cv_buffer, 0);
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 check_format(AVCodecContext *avctx)
{
AVCodecParserContext *parser;
uint8_t *pout;
int psize;
int index;
H264Context *h;
int ret = -1;
/* init parser & parse file */
parser = av_parser_init(avctx->codec->id);
if (!parser) {
av_log(avctx, AV_LOG_ERROR, "Failed to open H.264 parser.\n");
goto final;
}
parser->flags = PARSER_FLAG_COMPLETE_FRAMES;
index = av_parser_parse2(parser, avctx, &pout, &psize, NULL, 0, 0, 0, 0);
if (index < 0) {
av_log(avctx, AV_LOG_ERROR, "Failed to parse this file.\n");
goto release_parser;
}
/* check if support */
h = parser->priv_data;
switch (h->sps.bit_depth_luma) {
case 8:
if (!CHROMA444 && !CHROMA422) {
// only this will H.264 decoder switch to hwaccel
ret = 0;
break;
}
default:
av_log(avctx, AV_LOG_ERROR, "Unsupported file.\n");
}
release_parser:
av_parser_close(parser);
final:
return ret;
}
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;
}
/* check if VDA supports this file */
if (check_format(avctx) < 0)
goto failed;
/* 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;
ctx->pix_fmt = avctx->get_format(avctx, avctx->codec->pix_fmts);
switch (ctx->pix_fmt) {
case PIX_FMT_UYVY422:
vda_ctx->cv_pix_fmt_type = '2vuy';
break;
case PIX_FMT_YUYV422:
vda_ctx->cv_pix_fmt_type = 'yuvs';
break;
case PIX_FMT_NV12:
vda_ctx->cv_pix_fmt_type = '420v';
break;
case 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_buffer = get_buffer;
avctx->release_buffer = release_buffer;
/* 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)"),
};
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