/*
  * Intel MediaSDK QSV codec-independent code
  *
  * copyright (c) 2013 Luca Barbato
  * copyright (c) 2015 Anton Khirnov <anton@khirnov.net>
  *

  * 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 <string.h>
 #include <sys/types.h>
 
 #include <mfx/mfxvideo.h>
 
 #include "libavutil/common.h"

 #include "libavutil/hwcontext.h"
 #include "libavutil/hwcontext_qsv.h"

 #include "libavutil/mem.h"
 #include "libavutil/log.h"

 #include "libavutil/pixdesc.h"

 #include "libavutil/pixfmt.h"
 #include "libavutil/time.h"
 
 #include "avcodec.h"
 #include "internal.h"

 #include "qsv.h"

 #include "qsv_internal.h"

 #include "qsvdec.h"

 static int qsv_init_session(AVCodecContext *avctx, QSVContext *q, mfxSession session,

                             AVBufferRef *hw_frames_ref, AVBufferRef *hw_device_ref)

 {

     int ret;
 
     if (session) {
         q->session = session;
     } else if (hw_frames_ref) {
         if (q->internal_session) {
             MFXClose(q->internal_session);
             q->internal_session = NULL;
         }
         av_buffer_unref(&q->frames_ctx.hw_frames_ctx);
 
         q->frames_ctx.hw_frames_ctx = av_buffer_ref(hw_frames_ref);
         if (!q->frames_ctx.hw_frames_ctx)
             return AVERROR(ENOMEM);
 

         ret = ff_qsv_init_session_frames(avctx, &q->internal_session,
                                          &q->frames_ctx, q->load_plugins,
                                          q->iopattern == MFX_IOPATTERN_OUT_OPAQUE_MEMORY);

         if (ret < 0) {
             av_buffer_unref(&q->frames_ctx.hw_frames_ctx);
             return ret;
         }
 
         q->session = q->internal_session;

     } else if (hw_device_ref) {
         if (q->internal_session) {
             MFXClose(q->internal_session);
             q->internal_session = NULL;
         }
 
         ret = ff_qsv_init_session_device(avctx, &q->internal_session,
                                          hw_device_ref, q->load_plugins);
         if (ret < 0)
             return ret;
 
         q->session = q->internal_session;

     } else {
         if (!q->internal_session) {
             ret = ff_qsv_init_internal_session(avctx, &q->internal_session,
                                                q->load_plugins);

             if (ret < 0)
                 return ret;

         }
 

         q->session = q->internal_session;

     }
 

     /* make sure the decoder is uninitialized */
     MFXVideoDECODE_Close(q->session);
 
     return 0;

 }
 

 static int qsv_decode_init(AVCodecContext *avctx, QSVContext *q)

 {

     const AVPixFmtDescriptor *desc;

     mfxSession session = NULL;

     int iopattern = 0;

     mfxVideoParam param = { 0 };

     int frame_width  = avctx->coded_width;
     int frame_height = avctx->coded_height;

     int ret;
 

     desc = av_pix_fmt_desc_get(avctx->sw_pix_fmt);
     if (!desc)
         return AVERROR_BUG;
 

     if (!q->async_fifo) {
         q->async_fifo = av_fifo_alloc((1 + q->async_depth) *
                                       (sizeof(mfxSyncPoint*) + sizeof(QSVFrame*)));
         if (!q->async_fifo)
             return AVERROR(ENOMEM);
     }

     if (avctx->pix_fmt == AV_PIX_FMT_QSV && avctx->hwaccel_context) {

         AVQSVContext *user_ctx = avctx->hwaccel_context;
         session           = user_ctx->session;
         iopattern         = user_ctx->iopattern;
         q->ext_buffers    = user_ctx->ext_buffers;
         q->nb_ext_buffers = user_ctx->nb_ext_buffers;
     }

     if (avctx->hw_frames_ctx) {
         AVHWFramesContext    *frames_ctx = (AVHWFramesContext*)avctx->hw_frames_ctx->data;
         AVQSVFramesContext *frames_hwctx = frames_ctx->hwctx;
 
         if (!iopattern) {
             if (frames_hwctx->frame_type & MFX_MEMTYPE_OPAQUE_FRAME)
                 iopattern = MFX_IOPATTERN_OUT_OPAQUE_MEMORY;
             else if (frames_hwctx->frame_type & MFX_MEMTYPE_VIDEO_MEMORY_DECODER_TARGET)
                 iopattern = MFX_IOPATTERN_OUT_VIDEO_MEMORY;
         }

 
         frame_width  = frames_hwctx->surfaces[0].Info.Width;
         frame_height = frames_hwctx->surfaces[0].Info.Height;

     }
 

     if (!iopattern)
         iopattern = MFX_IOPATTERN_OUT_SYSTEM_MEMORY;
     q->iopattern = iopattern;
 

     ret = qsv_init_session(avctx, q, session, avctx->hw_frames_ctx, avctx->hw_device_ctx);

     if (ret < 0) {
         av_log(avctx, AV_LOG_ERROR, "Error initializing an MFX session\n");
         return ret;

     }

     ret = ff_qsv_codec_id_to_mfx(avctx->codec_id);

     if (ret < 0)

         return ret;
 

     param.mfx.CodecId      = ret;
     param.mfx.CodecProfile = ff_qsv_profile_to_mfx(avctx->codec_id, avctx->profile);
     param.mfx.CodecLevel   = avctx->level == FF_LEVEL_UNKNOWN ? MFX_LEVEL_UNKNOWN : avctx->level;

     param.mfx.FrameInfo.BitDepthLuma   = desc->comp[0].depth;
     param.mfx.FrameInfo.BitDepthChroma = desc->comp[0].depth;
     param.mfx.FrameInfo.Shift          = desc->comp[0].depth > 8;

     param.mfx.FrameInfo.FourCC         = q->fourcc;

     param.mfx.FrameInfo.Width          = frame_width;
     param.mfx.FrameInfo.Height         = frame_height;

     param.mfx.FrameInfo.ChromaFormat   = MFX_CHROMAFORMAT_YUV420;
 
     switch (avctx->field_order) {
     case AV_FIELD_PROGRESSIVE:
         param.mfx.FrameInfo.PicStruct = MFX_PICSTRUCT_PROGRESSIVE;
         break;
     case AV_FIELD_TT:
         param.mfx.FrameInfo.PicStruct = MFX_PICSTRUCT_FIELD_TFF;
         break;
     case AV_FIELD_BB:
         param.mfx.FrameInfo.PicStruct = MFX_PICSTRUCT_FIELD_BFF;
         break;
     default:
         param.mfx.FrameInfo.PicStruct = MFX_PICSTRUCT_UNKNOWN;
         break;

     }

     param.IOPattern   = q->iopattern;
     param.AsyncDepth  = q->async_depth;
     param.ExtParam    = q->ext_buffers;
     param.NumExtParam = q->nb_ext_buffers;
 
     ret = MFXVideoDECODE_Init(q->session, &param);

     if (ret < 0)
         return ff_qsv_print_error(avctx, ret,
                                   "Error initializing the MFX video decoder");

     q->frame_info = param.mfx.FrameInfo;
 

     return 0;
 }
 

 static int alloc_frame(AVCodecContext *avctx, QSVContext *q, QSVFrame *frame)

 {
     int ret;
 
     ret = ff_get_buffer(avctx, frame->frame, AV_GET_BUFFER_FLAG_REF);
     if (ret < 0)
         return ret;
 
     if (frame->frame->format == AV_PIX_FMT_QSV) {

         frame->surface = *(mfxFrameSurface1*)frame->frame->data[3];

     } else {

         frame->surface.Info = q->frame_info;

         frame->surface.Data.PitchLow = frame->frame->linesize[0];
         frame->surface.Data.Y        = frame->frame->data[0];
         frame->surface.Data.UV       = frame->frame->data[1];

     }
 

     if (q->frames_ctx.mids) {
         ret = ff_qsv_find_surface_idx(&q->frames_ctx, frame);
         if (ret < 0)
             return ret;
 
         frame->surface.Data.MemId = &q->frames_ctx.mids[ret];
     }
 

     frame->used = 1;
 

     return 0;
 }
 
 static void qsv_clear_unused_frames(QSVContext *q)
 {
     QSVFrame *cur = q->work_frames;
     while (cur) {

         if (cur->used && !cur->surface.Data.Locked && !cur->queued) {
             cur->used = 0;

             av_frame_unref(cur->frame);
         }
         cur = cur->next;
     }
 }
 
 static int get_surface(AVCodecContext *avctx, QSVContext *q, mfxFrameSurface1 **surf)
 {
     QSVFrame *frame, **last;
     int ret;
 
     qsv_clear_unused_frames(q);
 
     frame = q->work_frames;
     last  = &q->work_frames;
     while (frame) {

         if (!frame->used) {

             ret = alloc_frame(avctx, q, frame);

             if (ret < 0)
                 return ret;

             *surf = &frame->surface;

             return 0;
         }
 
         last  = &frame->next;
         frame = frame->next;
     }
 
     frame = av_mallocz(sizeof(*frame));
     if (!frame)
         return AVERROR(ENOMEM);
     frame->frame = av_frame_alloc();
     if (!frame->frame) {
         av_freep(&frame);
         return AVERROR(ENOMEM);
     }
     *last = frame;
 

     ret = alloc_frame(avctx, q, frame);

     if (ret < 0)
         return ret;
 

     *surf = &frame->surface;

 
     return 0;
 }
 

 static QSVFrame *find_frame(QSVContext *q, mfxFrameSurface1 *surf)

 {
     QSVFrame *cur = q->work_frames;
     while (cur) {

         if (surf == &cur->surface)

             return cur;

         cur = cur->next;
     }
     return NULL;
 }
 

 static int qsv_decode(AVCodecContext *avctx, QSVContext *q,
                       AVFrame *frame, int *got_frame,
                       AVPacket *avpkt)

 {

     QSVFrame *out_frame;

     mfxFrameSurface1 *insurf;
     mfxFrameSurface1 *outsurf;

     mfxSyncPoint *sync;

     mfxBitstream bs = { { { 0 } } };
     int ret;

     if (avpkt->size) {
         bs.Data       = avpkt->data;
         bs.DataLength = avpkt->size;

         bs.MaxLength  = bs.DataLength;
         bs.TimeStamp  = avpkt->pts;
     }
 

     sync = av_mallocz(sizeof(*sync));
     if (!sync) {
         av_freep(&sync);
         return AVERROR(ENOMEM);
     }
 
     do {

         ret = get_surface(avctx, q, &insurf);

         if (ret < 0) {
             av_freep(&sync);

             return ret;

         }

         ret = MFXVideoDECODE_DecodeFrameAsync(q->session, avpkt->size ? &bs : NULL,
                                               insurf, &outsurf, sync);
         if (ret == MFX_WRN_DEVICE_BUSY)
             av_usleep(500);

     } while (ret == MFX_WRN_DEVICE_BUSY || ret == MFX_ERR_MORE_SURFACE);

     if (ret != MFX_ERR_NONE &&
         ret != MFX_ERR_MORE_DATA &&
         ret != MFX_WRN_VIDEO_PARAM_CHANGED &&
         ret != MFX_ERR_MORE_SURFACE) {
         av_freep(&sync);

         return ff_qsv_print_error(avctx, ret,
                                   "Error during QSV decoding.");

     }

     /* make sure we do not enter an infinite loop if the SDK
      * did not consume any data and did not return anything */

     if (!*sync && !bs.DataOffset) {

         bs.DataOffset = avpkt->size;

         ++q->zero_consume_run;
         if (q->zero_consume_run > 1)
             ff_qsv_print_warning(avctx, ret, "A decode call did not consume any data");
     } else {
         q->zero_consume_run = 0;

     }
 

     if (*sync) {
         QSVFrame *out_frame = find_frame(q, outsurf);

         if (!out_frame) {
             av_log(avctx, AV_LOG_ERROR,
                    "The returned surface does not correspond to any frame\n");
             av_freep(&sync);
             return AVERROR_BUG;
         }
 
         out_frame->queued = 1;
         av_fifo_generic_write(q->async_fifo, &out_frame, sizeof(out_frame), NULL);
         av_fifo_generic_write(q->async_fifo, &sync,      sizeof(sync),      NULL);
     } else {
         av_freep(&sync);

     }
 

     if (!av_fifo_space(q->async_fifo) ||
         (!avpkt->size && av_fifo_size(q->async_fifo))) {

         AVFrame *src_frame;
 
         av_fifo_generic_read(q->async_fifo, &out_frame, sizeof(out_frame), NULL);
         av_fifo_generic_read(q->async_fifo, &sync,      sizeof(sync),      NULL);
         out_frame->queued = 0;
 

         if (avctx->pix_fmt != AV_PIX_FMT_QSV) {
             do {
                 ret = MFXVideoCORE_SyncOperation(q->session, *sync, 1000);
             } while (ret == MFX_WRN_IN_EXECUTION);
         }

         av_freep(&sync);
 

         src_frame = out_frame->frame;
 

         ret = av_frame_ref(frame, src_frame);
         if (ret < 0)
             return ret;
 

         outsurf = &out_frame->surface;

 #if FF_API_PKT_PTS
 FF_DISABLE_DEPRECATION_WARNINGS
         frame->pkt_pts = outsurf->Data.TimeStamp;
 FF_ENABLE_DEPRECATION_WARNINGS
 #endif
         frame->pts = outsurf->Data.TimeStamp;

 
         frame->repeat_pict =
             outsurf->Info.PicStruct & MFX_PICSTRUCT_FRAME_TRIPLING ? 4 :
             outsurf->Info.PicStruct & MFX_PICSTRUCT_FRAME_DOUBLING ? 2 :
             outsurf->Info.PicStruct & MFX_PICSTRUCT_FIELD_REPEATED ? 1 : 0;
         frame->top_field_first =
             outsurf->Info.PicStruct & MFX_PICSTRUCT_FIELD_TFF;
         frame->interlaced_frame =
             !(outsurf->Info.PicStruct & MFX_PICSTRUCT_PROGRESSIVE);
 

         /* update the surface properties */
         if (avctx->pix_fmt == AV_PIX_FMT_QSV)
             ((mfxFrameSurface1*)frame->data[3])->Info = outsurf->Info;
 

         *got_frame = 1;
     }
 

     return bs.DataOffset;

 }
 

 int ff_qsv_decode_close(QSVContext *q)

 {

     QSVFrame *cur = q->work_frames;

     if (q->session)
         MFXVideoDECODE_Close(q->session);

     while (q->async_fifo && av_fifo_size(q->async_fifo)) {
         QSVFrame *out_frame;
         mfxSyncPoint *sync;

         av_fifo_generic_read(q->async_fifo, &out_frame, sizeof(out_frame), NULL);
         av_fifo_generic_read(q->async_fifo, &sync,      sizeof(sync),      NULL);

         av_freep(&sync);
     }

     while (cur) {
         q->work_frames = cur->next;
         av_frame_free(&cur->frame);
         av_freep(&cur);

         cur = q->work_frames;
     }
 

     av_fifo_free(q->async_fifo);
     q->async_fifo = NULL;
 
     av_parser_close(q->parser);
     avcodec_free_context(&q->avctx_internal);

     if (q->internal_session)
         MFXClose(q->internal_session);

     av_buffer_unref(&q->frames_ctx.hw_frames_ctx);

     av_buffer_unref(&q->frames_ctx.mids_buf);

 
     return 0;

 }

 int ff_qsv_process_data(AVCodecContext *avctx, QSVContext *q,
                         AVFrame *frame, int *got_frame, AVPacket *pkt)

 {

     uint8_t *dummy_data;
     int dummy_size;
     int ret;

     if (!q->avctx_internal) {
         q->avctx_internal = avcodec_alloc_context3(NULL);
         if (!q->avctx_internal)
             return AVERROR(ENOMEM);

         q->parser = av_parser_init(avctx->codec_id);
         if (!q->parser)
             return AVERROR(ENOMEM);

         q->parser->flags |= PARSER_FLAG_COMPLETE_FRAMES;
         q->orig_pix_fmt   = AV_PIX_FMT_NONE;
     }
 
     if (!pkt->size)
         return qsv_decode(avctx, q, frame, got_frame, pkt);
 
     /* we assume the packets are already split properly and want
      * just the codec parameters here */
     av_parser_parse2(q->parser, q->avctx_internal,
                      &dummy_data, &dummy_size,
                      pkt->data, pkt->size, pkt->pts, pkt->dts,
                      pkt->pos);
 
     /* TODO: flush delayed frames on reinit */
     if (q->parser->format       != q->orig_pix_fmt    ||
         q->parser->coded_width  != avctx->coded_width ||
         q->parser->coded_height != avctx->coded_height) {
         enum AVPixelFormat pix_fmts[3] = { AV_PIX_FMT_QSV,
                                            AV_PIX_FMT_NONE,
                                            AV_PIX_FMT_NONE };
         enum AVPixelFormat qsv_format;
 

         qsv_format = ff_qsv_map_pixfmt(q->parser->format, &q->fourcc);

         if (qsv_format < 0) {
             av_log(avctx, AV_LOG_ERROR,

                    "Decoding pixel format '%s' is not supported\n",
                    av_get_pix_fmt_name(q->parser->format));

             ret = AVERROR(ENOSYS);
             goto reinit_fail;
         }

         q->orig_pix_fmt     = q->parser->format;
         avctx->pix_fmt      = pix_fmts[1] = qsv_format;
         avctx->width        = q->parser->width;
         avctx->height       = q->parser->height;
         avctx->coded_width  = q->parser->coded_width;
         avctx->coded_height = q->parser->coded_height;
         avctx->field_order  = q->parser->field_order;
         avctx->level        = q->avctx_internal->level;
         avctx->profile      = q->avctx_internal->profile;
 
         ret = ff_get_format(avctx, pix_fmts);
         if (ret < 0)
             goto reinit_fail;

         avctx->pix_fmt = ret;

         ret = qsv_decode_init(avctx, q);
         if (ret < 0)
             goto reinit_fail;
     }
 
     return qsv_decode(avctx, q, frame, got_frame, pkt);
 
 reinit_fail:
     q->orig_pix_fmt = q->parser->format = avctx->pix_fmt = AV_PIX_FMT_NONE;
     return ret;
 }
 
 void ff_qsv_decode_flush(AVCodecContext *avctx, QSVContext *q)
 {
     q->orig_pix_fmt = AV_PIX_FMT_NONE;

 }