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/*

 * Intel MediaSDK QSV based H.264 / HEVC decoder

 *

 * copyright (c) 2013 Luca Barbato

 * copyright (c) 2015 Anton Khirnov

 *

 * 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 

#include 

#include 

#include "libavutil/common.h"

#include "libavutil/fifo.h"

#include "libavutil/opt.h"

#include "avcodec.h"

#include "internal.h"

#include "qsvdec.h"

enum LoadPlugin {

    LOAD_PLUGIN_NONE,

    LOAD_PLUGIN_HEVC_SW,

};

typedef struct QSVH2645Context {

    AVClass *class;

    QSVContext qsv;

    int load_plugin;

    // the filter for converting to Annex B

    AVBitStreamFilterContext *bsf;

} QSVH2645Context;

static av_cold int qsv_decode_close(AVCodecContext *avctx)

{

    QSVH2645Context *s = avctx->priv_data;

    ff_qsv_decode_close(&s->qsv);

    av_bitstream_filter_close(s->bsf);

    return 0;

}

static av_cold int qsv_decode_init(AVCodecContext *avctx)

{

    QSVH2645Context *s = avctx->priv_data;

    int ret;

    if (avctx->codec_id == AV_CODEC_ID_HEVC && s->load_plugin != LOAD_PLUGIN_NONE) {

        static const char *uid_hevcenc_sw = "15dd936825ad475ea34e35f3f54217a6";

        if (s->qsv.load_plugins[0]) {

            av_log(avctx, AV_LOG_WARNING,

                   "load_plugins is not empty, but load_plugin is not set to 'none'."

                   "The load_plugin value will be ignored.\n");

        } else {

            av_freep(&s->qsv.load_plugins);

            s->qsv.load_plugins = av_strdup(uid_hevcenc_sw);

            if (!s->qsv.load_plugins)

                return AVERROR(ENOMEM);

        }

    }

    if (avctx->codec_id == AV_CODEC_ID_H264)

        s->bsf = av_bitstream_filter_init("h264_mp4toannexb");

    else

        s->bsf = av_bitstream_filter_init("hevc_mp4toannexb");

    if (!s->bsf) {

        ret = AVERROR(ENOMEM);

        goto fail;

    }

    return 0;

fail:

    qsv_decode_close(avctx);

    return ret;

}

static int qsv_decode_frame(AVCodecContext *avctx, void *data,

                            int *got_frame, AVPacket *avpkt)

{

    QSVH2645Context *s = avctx->priv_data;

    AVFrame *frame    = data;

    int ret;

    uint8_t *p_filtered = NULL;

    int      n_filtered = NULL;

    AVPacket pkt_filtered = { 0 };

    if (avpkt->size) {

        if (avpkt->size > 3 && !avpkt->data[0] &&

            !avpkt->data[1] && !avpkt->data[2] && 1==avpkt->data[3]) {

            /* we already have annex-b prefix */

            return ff_qsv_decode(avctx, &s->qsv, frame, got_frame, avpkt);

        } else {

            /* no annex-b prefix. try to restore: */

            ret = av_bitstream_filter_filter(s->bsf, avctx, "private_spspps_buf",

                                         &p_filtered, &n_filtered,

                                         avpkt->data, avpkt->size, 0);

            if (ret>=0) {

                pkt_filtered.pts  = avpkt->pts;

                pkt_filtered.data = p_filtered;

                pkt_filtered.size = n_filtered;

                ret = ff_qsv_decode(avctx, &s->qsv, frame, got_frame, &pkt_filtered);

                if (p_filtered != avpkt->data)

                    av_free(p_filtered);

                return ret > 0 ? avpkt->size : ret;

            }

        }

    }

    return ff_qsv_decode(avctx, &s->qsv, frame, got_frame, avpkt);

}

static void qsv_decode_flush(AVCodecContext *avctx)

{

//    QSVH2645Context *s = avctx->priv_data;

    /* TODO: flush qsv engine if necessary */

}

#define OFFSET(x) offsetof(QSVH2645Context, x)

#define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM

#if CONFIG_HEVC_QSV_DECODER

AVHWAccel ff_hevc_qsv_hwaccel = {

    .name           = "hevc_qsv",

    .type           = AVMEDIA_TYPE_VIDEO,

    .id             = AV_CODEC_ID_HEVC,

    .pix_fmt        = AV_PIX_FMT_QSV,

};

static const AVOption hevc_options[] = {

    { "async_depth", "Internal parallelization depth, the higher the value the higher the latency.", OFFSET(qsv.async_depth), AV_OPT_TYPE_INT, { .i64 = ASYNC_DEPTH_DEFAULT }, 0, INT_MAX, VD },

    { "load_plugin", "A user plugin to load in an internal session", OFFSET(load_plugin), AV_OPT_TYPE_INT, { .i64 = LOAD_PLUGIN_HEVC_SW }, LOAD_PLUGIN_NONE, LOAD_PLUGIN_HEVC_SW, VD, "load_plugin" },

    { "none",     NULL, 0, AV_OPT_TYPE_CONST, { .i64 = LOAD_PLUGIN_NONE },    0, 0, VD, "load_plugin" },

    { "hevc_sw",  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = LOAD_PLUGIN_HEVC_SW }, 0, 0, VD, "load_plugin" },

    { "load_plugins", "A :-separate list of hexadecimal plugin UIDs to load in an internal session",

        OFFSET(qsv.load_plugins), AV_OPT_TYPE_STRING, { .str = "" }, 0, 0, VD },

    { NULL },

};

static const AVClass hevc_class = {

    .class_name = "hevc_qsv",

    .item_name  = av_default_item_name,

    .option     = hevc_options,

    .version    = LIBAVUTIL_VERSION_INT,

};

AVCodec ff_hevc_qsv_decoder = {

    .name           = "hevc_qsv",

    .long_name      = NULL_IF_CONFIG_SMALL("HEVC (Intel Quick Sync Video acceleration)"),

    .priv_data_size = sizeof(QSVH2645Context),

    .type           = AVMEDIA_TYPE_VIDEO,

    .id             = AV_CODEC_ID_HEVC,

    .init           = qsv_decode_init,

    .decode         = qsv_decode_frame,

    .flush          = qsv_decode_flush,

    .close          = qsv_decode_close,

    .capabilities   = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_DR1,

    .priv_class     = &hevc_class,

};

#endif

#if CONFIG_H264_QSV_DECODER

AVHWAccel ff_h264_qsv_hwaccel = {

    .name           = "h264_qsv",

    .type           = AVMEDIA_TYPE_VIDEO,

    .id             = AV_CODEC_ID_H264,

    .pix_fmt        = AV_PIX_FMT_QSV,

};

static const AVOption options[] = {

    { "async_depth", "Internal parallelization depth, the higher the value the higher the latency.", OFFSET(qsv.async_depth), AV_OPT_TYPE_INT, { .i64 = ASYNC_DEPTH_DEFAULT }, 0, INT_MAX, VD },

    { NULL },

};

static const AVClass class = {

    .class_name = "h264_qsv",

    .item_name  = av_default_item_name,

    .option     = options,

    .version    = LIBAVUTIL_VERSION_INT,

};

AVCodec ff_h264_qsv_decoder = {

    .name           = "h264_qsv",

    .long_name      = NULL_IF_CONFIG_SMALL("H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (Intel Quick Sync Video acceleration)"),

    .priv_data_size = sizeof(QSVH2645Context),

    .type           = AVMEDIA_TYPE_VIDEO,

    .id             = AV_CODEC_ID_H264,

    .init           = qsv_decode_init,

    .decode         = qsv_decode_frame,

    .flush          = qsv_decode_flush,

    .close          = qsv_decode_close,

    .capabilities   = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_DR1,

    .priv_class     = &class,

};

#endif