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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 

 */

#include 

#include 

#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)"),

};