/*
  * Android MediaCodec decoder
  *
  * Copyright (c) 2015-2016 Matthieu Bouron <matthieu.bouron stupeflix.com>
  *
  * 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 "libavutil/common.h"

 #include "libavutil/hwcontext_mediacodec.h"

 #include "libavutil/mem.h"
 #include "libavutil/log.h"
 #include "libavutil/pixfmt.h"
 #include "libavutil/time.h"
 #include "libavutil/timestamp.h"
 
 #include "avcodec.h"
 #include "internal.h"
 
 #include "mediacodec.h"
 #include "mediacodec_surface.h"
 #include "mediacodec_sw_buffer.h"
 #include "mediacodec_wrapper.h"
 #include "mediacodecdec_common.h"
 
 /**
  * OMX.k3.video.decoder.avc, OMX.NVIDIA.* OMX.SEC.avc.dec and OMX.google
  * codec workarounds used in various place are taken from the Gstreamer
  * project.
  *
  * Gstreamer references:
  * https://cgit.freedesktop.org/gstreamer/gst-plugins-bad/tree/sys/androidmedia/
  *
  * Gstreamer copyright notice:
  *
  * Copyright (C) 2012, Collabora Ltd.
  *   Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>
  *
  * Copyright (C) 2012, Rafaël Carré <funman@videolanorg>
  *
  * Copyright (C) 2015, Sebastian Dröge <sebastian@centricular.com>
  *
  * Copyright (C) 2014-2015, Collabora Ltd.
  *   Author: Matthieu Bouron <matthieu.bouron@gcollabora.com>
  *
  * Copyright (C) 2015, Edward Hervey
  *   Author: Edward Hervey <bilboed@gmail.com>
  *
  * Copyright (C) 2015, Matthew Waters <matthew@centricular.com>
  *
  * This library 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
  * version 2.1 of the License.
  *
  * This library 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 this library; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  *
  */
 
 #define INPUT_DEQUEUE_TIMEOUT_US 8000
 #define OUTPUT_DEQUEUE_TIMEOUT_US 8000
 #define OUTPUT_DEQUEUE_BLOCK_TIMEOUT_US 1000000
 
 enum {
     COLOR_FormatYUV420Planar                              = 0x13,
     COLOR_FormatYUV420SemiPlanar                          = 0x15,
     COLOR_FormatYCbYCr                                    = 0x19,
     COLOR_FormatAndroidOpaque                             = 0x7F000789,
     COLOR_QCOM_FormatYUV420SemiPlanar                     = 0x7fa30c00,
     COLOR_QCOM_FormatYUV420SemiPlanar32m                  = 0x7fa30c04,
     COLOR_QCOM_FormatYUV420PackedSemiPlanar64x32Tile2m8ka = 0x7fa30c03,
     COLOR_TI_FormatYUV420PackedSemiPlanar                 = 0x7f000100,
     COLOR_TI_FormatYUV420PackedSemiPlanarInterlaced       = 0x7f000001,
 };
 
 static const struct {
 
     int color_format;
     enum AVPixelFormat pix_fmt;
 
 } color_formats[] = {
 
     { COLOR_FormatYUV420Planar,                              AV_PIX_FMT_YUV420P },
     { COLOR_FormatYUV420SemiPlanar,                          AV_PIX_FMT_NV12    },
     { COLOR_QCOM_FormatYUV420SemiPlanar,                     AV_PIX_FMT_NV12    },
     { COLOR_QCOM_FormatYUV420SemiPlanar32m,                  AV_PIX_FMT_NV12    },
     { COLOR_QCOM_FormatYUV420PackedSemiPlanar64x32Tile2m8ka, AV_PIX_FMT_NV12    },
     { COLOR_TI_FormatYUV420PackedSemiPlanar,                 AV_PIX_FMT_NV12    },
     { COLOR_TI_FormatYUV420PackedSemiPlanarInterlaced,       AV_PIX_FMT_NV12    },
     { 0 }
 };
 
 static enum AVPixelFormat mcdec_map_color_format(AVCodecContext *avctx,
                                                  MediaCodecDecContext *s,
                                                  int color_format)
 {
     int i;
     enum AVPixelFormat ret = AV_PIX_FMT_NONE;
 
     if (s->surface) {
         return AV_PIX_FMT_MEDIACODEC;
     }
 
     if (!strcmp(s->codec_name, "OMX.k3.video.decoder.avc") && color_format == COLOR_FormatYCbYCr) {
         s->color_format = color_format = COLOR_TI_FormatYUV420PackedSemiPlanar;
     }
 
     for (i = 0; i < FF_ARRAY_ELEMS(color_formats); i++) {
         if (color_formats[i].color_format == color_format) {
             return color_formats[i].pix_fmt;
         }
     }
 
     av_log(avctx, AV_LOG_ERROR, "Output color format 0x%x (value=%d) is not supported\n",
         color_format, color_format);
 
     return ret;
 }
 
 static void ff_mediacodec_dec_ref(MediaCodecDecContext *s)
 {

     atomic_fetch_add(&s->refcount, 1);

 }
 
 static void ff_mediacodec_dec_unref(MediaCodecDecContext *s)
 {
     if (!s)
         return;
 

     if (atomic_fetch_sub(&s->refcount, 1) == 1) {

         if (s->codec) {
             ff_AMediaCodec_delete(s->codec);
             s->codec = NULL;
         }
 
         if (s->format) {
             ff_AMediaFormat_delete(s->format);
             s->format = NULL;
         }
 
         if (s->surface) {
             ff_mediacodec_surface_unref(s->surface, NULL);
             s->surface = NULL;
         }
 
         av_freep(&s->codec_name);
         av_freep(&s);
     }
 }
 
 static void mediacodec_buffer_release(void *opaque, uint8_t *data)
 {
     AVMediaCodecBuffer *buffer = opaque;
     MediaCodecDecContext *ctx = buffer->ctx;

     int released = atomic_load(&buffer->released);

     if (!released && (ctx->delay_flush || buffer->serial == atomic_load(&ctx->serial))) {

         atomic_fetch_sub(&ctx->hw_buffer_count, 1);
         av_log(ctx->avctx, AV_LOG_DEBUG,
                "Releasing output buffer %zd (%p) ts=%"PRId64" on free() [%d pending]\n",
                buffer->index, buffer, buffer->pts, atomic_load(&ctx->hw_buffer_count));

         ff_AMediaCodec_releaseOutputBuffer(ctx->codec, buffer->index, 0);
     }
 

     if (ctx->delay_flush)
         ff_mediacodec_dec_unref(ctx);

     av_freep(&buffer);
 }
 
 static int mediacodec_wrap_hw_buffer(AVCodecContext *avctx,
                                   MediaCodecDecContext *s,
                                   ssize_t index,
                                   FFAMediaCodecBufferInfo *info,
                                   AVFrame *frame)
 {
     int ret = 0;
     int status = 0;
     AVMediaCodecBuffer *buffer = NULL;
 
     frame->buf[0] = NULL;
     frame->width = avctx->width;
     frame->height = avctx->height;
     frame->format = avctx->pix_fmt;

     frame->sample_aspect_ratio = avctx->sample_aspect_ratio;

 
     if (avctx->pkt_timebase.num && avctx->pkt_timebase.den) {
         frame->pts = av_rescale_q(info->presentationTimeUs,

                                       AV_TIME_BASE_Q,

                                       avctx->pkt_timebase);
     } else {
         frame->pts = info->presentationTimeUs;
     }
 #if FF_API_PKT_PTS
 FF_DISABLE_DEPRECATION_WARNINGS
     frame->pkt_pts = frame->pts;
 FF_ENABLE_DEPRECATION_WARNINGS
 #endif
     frame->pkt_dts = AV_NOPTS_VALUE;
 
     buffer = av_mallocz(sizeof(AVMediaCodecBuffer));
     if (!buffer) {
         ret = AVERROR(ENOMEM);
         goto fail;
     }
 

     atomic_init(&buffer->released, 0);

 
     frame->buf[0] = av_buffer_create(NULL,
                                      0,
                                      mediacodec_buffer_release,
                                      buffer,
                                      AV_BUFFER_FLAG_READONLY);
 
     if (!frame->buf[0]) {
         ret = AVERROR(ENOMEM);
         goto fail;
 
     }
 
     buffer->ctx = s;

     buffer->serial = atomic_load(&s->serial);
     if (s->delay_flush)
         ff_mediacodec_dec_ref(s);

 
     buffer->index = index;
     buffer->pts = info->presentationTimeUs;
 
     frame->data[3] = (uint8_t *)buffer;
 

     atomic_fetch_add(&s->hw_buffer_count, 1);
     av_log(avctx, AV_LOG_DEBUG,
             "Wrapping output buffer %zd (%p) ts=%"PRId64" [%d pending]\n",
             buffer->index, buffer, buffer->pts, atomic_load(&s->hw_buffer_count));
 

     return 0;
 fail:
     av_freep(buffer);
     av_buffer_unref(&frame->buf[0]);
     status = ff_AMediaCodec_releaseOutputBuffer(s->codec, index, 0);
     if (status < 0) {
         av_log(avctx, AV_LOG_ERROR, "Failed to release output buffer\n");
         ret = AVERROR_EXTERNAL;
     }
 
     return ret;
 }
 
 static int mediacodec_wrap_sw_buffer(AVCodecContext *avctx,
                                   MediaCodecDecContext *s,
                                   uint8_t *data,
                                   size_t size,
                                   ssize_t index,
                                   FFAMediaCodecBufferInfo *info,
                                   AVFrame *frame)
 {
     int ret = 0;
     int status = 0;
 
     frame->width = avctx->width;
     frame->height = avctx->height;
     frame->format = avctx->pix_fmt;
 
     /* MediaCodec buffers needs to be copied to our own refcounted buffers
      * because the flush command invalidates all input and output buffers.
      */
     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
         av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer\n");
         goto done;
     }
 
     /* Override frame->pkt_pts as ff_get_buffer will override its value based
      * on the last avpacket received which is not in sync with the frame:
      *   * N avpackets can be pushed before 1 frame is actually returned
      *   * 0-sized avpackets are pushed to flush remaining frames at EOS */

     if (avctx->pkt_timebase.num && avctx->pkt_timebase.den) {
         frame->pts = av_rescale_q(info->presentationTimeUs,

                                       AV_TIME_BASE_Q,

                                       avctx->pkt_timebase);
     } else {
         frame->pts = info->presentationTimeUs;
     }

 #if FF_API_PKT_PTS
 FF_DISABLE_DEPRECATION_WARNINGS

     frame->pkt_pts = frame->pts;

 FF_ENABLE_DEPRECATION_WARNINGS
 #endif
     frame->pkt_dts = AV_NOPTS_VALUE;
 

     av_log(avctx, AV_LOG_TRACE,

             "Frame: width=%d stride=%d height=%d slice-height=%d "
             "crop-top=%d crop-bottom=%d crop-left=%d crop-right=%d encoder=%s\n"
             "destination linesizes=%d,%d,%d\n" ,
             avctx->width, s->stride, avctx->height, s->slice_height,
             s->crop_top, s->crop_bottom, s->crop_left, s->crop_right, s->codec_name,
             frame->linesize[0], frame->linesize[1], frame->linesize[2]);
 
     switch (s->color_format) {
     case COLOR_FormatYUV420Planar:
         ff_mediacodec_sw_buffer_copy_yuv420_planar(avctx, s, data, size, info, frame);
         break;
     case COLOR_FormatYUV420SemiPlanar:
     case COLOR_QCOM_FormatYUV420SemiPlanar:
     case COLOR_QCOM_FormatYUV420SemiPlanar32m:
         ff_mediacodec_sw_buffer_copy_yuv420_semi_planar(avctx, s, data, size, info, frame);
         break;
     case COLOR_TI_FormatYUV420PackedSemiPlanar:
     case COLOR_TI_FormatYUV420PackedSemiPlanarInterlaced:
         ff_mediacodec_sw_buffer_copy_yuv420_packed_semi_planar(avctx, s, data, size, info, frame);
         break;
     case COLOR_QCOM_FormatYUV420PackedSemiPlanar64x32Tile2m8ka:
         ff_mediacodec_sw_buffer_copy_yuv420_packed_semi_planar_64x32Tile2m8ka(avctx, s, data, size, info, frame);
         break;
     default:
         av_log(avctx, AV_LOG_ERROR, "Unsupported color format 0x%x (value=%d)\n",
             s->color_format, s->color_format);
         ret = AVERROR(EINVAL);
         goto done;
     }
 
     ret = 0;
 done:
     status = ff_AMediaCodec_releaseOutputBuffer(s->codec, index, 0);
     if (status < 0) {
         av_log(avctx, AV_LOG_ERROR, "Failed to release output buffer\n");
         ret = AVERROR_EXTERNAL;
     }
 
     return ret;
 }
 

 #define AMEDIAFORMAT_GET_INT32(name, key, mandatory) do {                              \
     int32_t value = 0;                                                                 \
     if (ff_AMediaFormat_getInt32(s->format, key, &value)) {                            \
         (name) = value;                                                                \
     } else if (mandatory) {                                                            \
         av_log(avctx, AV_LOG_ERROR, "Could not get %s from format %s\n", key, format); \
         ret = AVERROR_EXTERNAL;                                                        \
         goto fail;                                                                     \
     }                                                                                  \
 } while (0)                                                                            \
 

 static int mediacodec_dec_parse_format(AVCodecContext *avctx, MediaCodecDecContext *s)
 {

     int ret = 0;

     int width = 0;
     int height = 0;
     char *format = NULL;
 
     if (!s->format) {
         av_log(avctx, AV_LOG_ERROR, "Output MediaFormat is not set\n");
         return AVERROR(EINVAL);
     }
 
     format = ff_AMediaFormat_toString(s->format);
     if (!format) {
         return AVERROR_EXTERNAL;
     }
     av_log(avctx, AV_LOG_DEBUG, "Parsing MediaFormat %s\n", format);
 
     /* Mandatory fields */

     AMEDIAFORMAT_GET_INT32(s->width,  "width", 1);
     AMEDIAFORMAT_GET_INT32(s->height, "height", 1);

     AMEDIAFORMAT_GET_INT32(s->stride, "stride", 0);

     s->stride = s->stride > 0 ? s->stride : s->width;

     AMEDIAFORMAT_GET_INT32(s->slice_height, "slice-height", 0);

     if (strstr(s->codec_name, "OMX.Nvidia.") && s->slice_height == 0) {

         s->slice_height = FFALIGN(s->height, 16);
     } else if (strstr(s->codec_name, "OMX.SEC.avc.dec")) {
         s->slice_height = avctx->height;
         s->stride = avctx->width;

     } else if (s->slice_height == 0) {
         s->slice_height = s->height;

     }
 

     AMEDIAFORMAT_GET_INT32(s->color_format, "color-format", 1);

     avctx->pix_fmt = mcdec_map_color_format(avctx, s, s->color_format);

     if (avctx->pix_fmt == AV_PIX_FMT_NONE) {
         av_log(avctx, AV_LOG_ERROR, "Output color format is not supported\n");

         ret = AVERROR(EINVAL);
         goto fail;

     }
 
     /* Optional fields */

     AMEDIAFORMAT_GET_INT32(s->crop_top,    "crop-top",    0);
     AMEDIAFORMAT_GET_INT32(s->crop_bottom, "crop-bottom", 0);
     AMEDIAFORMAT_GET_INT32(s->crop_left,   "crop-left",   0);
     AMEDIAFORMAT_GET_INT32(s->crop_right,  "crop-right",  0);

 
     width = s->crop_right + 1 - s->crop_left;
     height = s->crop_bottom + 1 - s->crop_top;
 

     AMEDIAFORMAT_GET_INT32(s->display_width,  "display-width",  0);
     AMEDIAFORMAT_GET_INT32(s->display_height, "display-height", 0);
 
     if (s->display_width && s->display_height) {
         AVRational sar = av_div_q(
             (AVRational){ s->display_width, s->display_height },
             (AVRational){ width, height });
         ff_set_sar(avctx, sar);
     }
 

     av_log(avctx, AV_LOG_INFO,
         "Output crop parameters top=%d bottom=%d left=%d right=%d, "
         "resulting dimensions width=%d height=%d\n",
         s->crop_top, s->crop_bottom, s->crop_left, s->crop_right,
         width, height);
 

     av_freep(&format);

     return ff_set_dimensions(avctx, width, height);

 fail:
     av_freep(&format);
     return ret;

 }
 
 static int mediacodec_dec_flush_codec(AVCodecContext *avctx, MediaCodecDecContext *s)
 {
     FFAMediaCodec *codec = s->codec;
     int status;
 

     s->output_buffer_count = 0;
 

     s->draining = 0;
     s->flushing = 0;
     s->eos = 0;

     atomic_fetch_add(&s->serial, 1);

     atomic_init(&s->hw_buffer_count, 0);

     s->current_input_buffer = -1;

 
     status = ff_AMediaCodec_flush(codec);
     if (status < 0) {
         av_log(avctx, AV_LOG_ERROR, "Failed to flush codec\n");
         return AVERROR_EXTERNAL;
     }
 
     return 0;
 }
 
 int ff_mediacodec_dec_init(AVCodecContext *avctx, MediaCodecDecContext *s,
                            const char *mime, FFAMediaFormat *format)
 {
     int ret = 0;
     int status;
     int profile;
 
     enum AVPixelFormat pix_fmt;
     static const enum AVPixelFormat pix_fmts[] = {
         AV_PIX_FMT_MEDIACODEC,
         AV_PIX_FMT_NONE,
     };
 

     s->avctx = avctx;

     atomic_init(&s->refcount, 1);

     atomic_init(&s->hw_buffer_count, 0);

     atomic_init(&s->serial, 1);

     s->current_input_buffer = -1;

 
     pix_fmt = ff_get_format(avctx, pix_fmts);
     if (pix_fmt == AV_PIX_FMT_MEDIACODEC) {
         AVMediaCodecContext *user_ctx = avctx->hwaccel_context;
 

         if (avctx->hw_device_ctx) {
             AVHWDeviceContext *device_ctx = (AVHWDeviceContext*)(avctx->hw_device_ctx->data);
             if (device_ctx->type == AV_HWDEVICE_TYPE_MEDIACODEC) {
                 if (device_ctx->hwctx) {
                     AVMediaCodecDeviceContext *mediacodec_ctx = (AVMediaCodecDeviceContext *)device_ctx->hwctx;
                     s->surface = ff_mediacodec_surface_ref(mediacodec_ctx->surface, avctx);
                     av_log(avctx, AV_LOG_INFO, "Using surface %p\n", s->surface);
                 }
             }
         }
 
         if (!s->surface && user_ctx && user_ctx->surface) {

             s->surface = ff_mediacodec_surface_ref(user_ctx->surface, avctx);
             av_log(avctx, AV_LOG_INFO, "Using surface %p\n", s->surface);
         }
     }
 
     profile = ff_AMediaCodecProfile_getProfileFromAVCodecContext(avctx);
     if (profile < 0) {

         av_log(avctx, AV_LOG_WARNING, "Unsupported or unknown profile\n");

     }
 
     s->codec_name = ff_AMediaCodecList_getCodecNameByType(mime, profile, 0, avctx);
     if (!s->codec_name) {
         ret = AVERROR_EXTERNAL;
         goto fail;
     }
 
     av_log(avctx, AV_LOG_DEBUG, "Found decoder %s\n", s->codec_name);
     s->codec = ff_AMediaCodec_createCodecByName(s->codec_name);
     if (!s->codec) {
         av_log(avctx, AV_LOG_ERROR, "Failed to create media decoder for type %s and name %s\n", mime, s->codec_name);
         ret = AVERROR_EXTERNAL;
         goto fail;
     }
 
     status = ff_AMediaCodec_configure(s->codec, format, s->surface, NULL, 0);
     if (status < 0) {
         char *desc = ff_AMediaFormat_toString(format);
         av_log(avctx, AV_LOG_ERROR,
             "Failed to configure codec (status = %d) with format %s\n",
             status, desc);
         av_freep(&desc);
 
         ret = AVERROR_EXTERNAL;
         goto fail;
     }
 
     status = ff_AMediaCodec_start(s->codec);
     if (status < 0) {
         char *desc = ff_AMediaFormat_toString(format);
         av_log(avctx, AV_LOG_ERROR,
             "Failed to start codec (status = %d) with format %s\n",
             status, desc);
         av_freep(&desc);
         ret = AVERROR_EXTERNAL;
         goto fail;
     }
 
     s->format = ff_AMediaCodec_getOutputFormat(s->codec);
     if (s->format) {
         if ((ret = mediacodec_dec_parse_format(avctx, s)) < 0) {
             av_log(avctx, AV_LOG_ERROR,
                 "Failed to configure context\n");
             goto fail;
         }
     }
 
     av_log(avctx, AV_LOG_DEBUG, "MediaCodec %p started successfully\n", s->codec);
 
     return 0;
 
 fail:
     av_log(avctx, AV_LOG_ERROR, "MediaCodec %p failed to start\n", s->codec);
     ff_mediacodec_dec_close(avctx, s);
     return ret;
 }
 

 int ff_mediacodec_dec_send(AVCodecContext *avctx, MediaCodecDecContext *s,

                            AVPacket *pkt, bool wait)

 {
     int offset = 0;
     int need_draining = 0;
     uint8_t *data;

     ssize_t index = s->current_input_buffer;

     size_t size;
     FFAMediaCodec *codec = s->codec;
     int status;

     int64_t input_dequeue_timeout_us = wait ? INPUT_DEQUEUE_TIMEOUT_US : 0;

     int64_t pts;

 
     if (s->flushing) {
         av_log(avctx, AV_LOG_ERROR, "Decoder is flushing and cannot accept new buffer "
                                     "until all output buffers have been released\n");
         return AVERROR_EXTERNAL;
     }
 
     if (pkt->size == 0) {
         need_draining = 1;
     }
 
     if (s->draining && s->eos) {

         return AVERROR_EOF;

     }
 
     while (offset < pkt->size || (need_draining && !s->draining)) {
         if (index < 0) {

             index = ff_AMediaCodec_dequeueInputBuffer(codec, input_dequeue_timeout_us);
             if (ff_AMediaCodec_infoTryAgainLater(codec, index)) {
                 av_log(avctx, AV_LOG_TRACE, "No input buffer available, try again later\n");
                 break;
             }
 
             if (index < 0) {
                 av_log(avctx, AV_LOG_ERROR, "Failed to dequeue input buffer (status=%zd)\n", index);
                 return AVERROR_EXTERNAL;
             }

         }

         s->current_input_buffer = -1;

 
         data = ff_AMediaCodec_getInputBuffer(codec, index, &size);
         if (!data) {
             av_log(avctx, AV_LOG_ERROR, "Failed to get input buffer\n");
             return AVERROR_EXTERNAL;
         }
 

         pts = pkt->pts;
         if (pts != AV_NOPTS_VALUE && avctx->pkt_timebase.num && avctx->pkt_timebase.den) {
             pts = av_rescale_q(pts, avctx->pkt_timebase, AV_TIME_BASE_Q);
         }
 

         if (need_draining) {
             uint32_t flags = ff_AMediaCodec_getBufferFlagEndOfStream(codec);
 
             av_log(avctx, AV_LOG_DEBUG, "Sending End Of Stream signal\n");
 
             status = ff_AMediaCodec_queueInputBuffer(codec, index, 0, 0, pts, flags);
             if (status < 0) {
                 av_log(avctx, AV_LOG_ERROR, "Failed to queue input empty buffer (status = %d)\n", status);
                 return AVERROR_EXTERNAL;
             }
 

             av_log(avctx, AV_LOG_TRACE,
                    "Queued input buffer %zd size=%zd ts=%"PRIi64"\n", index, size, pts);

             s->draining = 1;
             break;
         } else {
             size = FFMIN(pkt->size - offset, size);
             memcpy(data, pkt->data + offset, size);
             offset += size;
 
             status = ff_AMediaCodec_queueInputBuffer(codec, index, 0, size, pts, 0);
             if (status < 0) {
                 av_log(avctx, AV_LOG_ERROR, "Failed to queue input buffer (status = %d)\n", status);
                 return AVERROR_EXTERNAL;
             }

 
             av_log(avctx, AV_LOG_TRACE,
                    "Queued input buffer %zd size=%zd ts=%"PRIi64"\n", index, size, pts);

         }
     }
 

     if (offset == 0)
         return AVERROR(EAGAIN);
     return offset;
 }
 
 int ff_mediacodec_dec_receive(AVCodecContext *avctx, MediaCodecDecContext *s,
                               AVFrame *frame, bool wait)
 {
     int ret;
     uint8_t *data;
     ssize_t index;
     size_t size;
     FFAMediaCodec *codec = s->codec;
     FFAMediaCodecBufferInfo info = { 0 };
     int status;
     int64_t output_dequeue_timeout_us = OUTPUT_DEQUEUE_TIMEOUT_US;
 
     if (s->draining && s->eos) {
         return AVERROR_EOF;
     }
 
     if (s->draining) {

         /* If the codec is flushing or need to be flushed, block for a fair
          * amount of time to ensure we got a frame */
         output_dequeue_timeout_us = OUTPUT_DEQUEUE_BLOCK_TIMEOUT_US;

     } else if (s->output_buffer_count == 0 || !wait) {
         /* If the codec hasn't produced any frames, do not block so we
          * can push data to it as fast as possible, and get the first
          * frame */

         output_dequeue_timeout_us = 0;
     }
 
     index = ff_AMediaCodec_dequeueOutputBuffer(codec, &info, output_dequeue_timeout_us);
     if (index >= 0) {

         av_log(avctx, AV_LOG_TRACE, "Got output buffer %zd"

                 " offset=%" PRIi32 " size=%" PRIi32 " ts=%" PRIi64
                 " flags=%" PRIu32 "\n", index, info.offset, info.size,
                 info.presentationTimeUs, info.flags);
 
         if (info.flags & ff_AMediaCodec_getBufferFlagEndOfStream(codec)) {
             s->eos = 1;
         }
 
         if (info.size) {
             if (s->surface) {
                 if ((ret = mediacodec_wrap_hw_buffer(avctx, s, index, &info, frame)) < 0) {
                     av_log(avctx, AV_LOG_ERROR, "Failed to wrap MediaCodec buffer\n");
                     return ret;
                 }
             } else {
                 data = ff_AMediaCodec_getOutputBuffer(codec, index, &size);
                 if (!data) {
                     av_log(avctx, AV_LOG_ERROR, "Failed to get output buffer\n");
                     return AVERROR_EXTERNAL;
                 }
 
                 if ((ret = mediacodec_wrap_sw_buffer(avctx, s, data, size, index, &info, frame)) < 0) {
                     av_log(avctx, AV_LOG_ERROR, "Failed to wrap MediaCodec buffer\n");
                     return ret;
                 }
             }
 

             s->output_buffer_count++;

             return 0;

         } else {
             status = ff_AMediaCodec_releaseOutputBuffer(codec, index, 0);
             if (status < 0) {
                 av_log(avctx, AV_LOG_ERROR, "Failed to release output buffer\n");
             }
         }
 
     } else if (ff_AMediaCodec_infoOutputFormatChanged(codec, index)) {
         char *format = NULL;
 
         if (s->format) {
             status = ff_AMediaFormat_delete(s->format);
             if (status < 0) {
                 av_log(avctx, AV_LOG_ERROR, "Failed to delete MediaFormat %p\n", s->format);
             }
         }
 
         s->format = ff_AMediaCodec_getOutputFormat(codec);
         if (!s->format) {
             av_log(avctx, AV_LOG_ERROR, "Failed to get output format\n");
             return AVERROR_EXTERNAL;
         }
 
         format = ff_AMediaFormat_toString(s->format);
         if (!format) {
             return AVERROR_EXTERNAL;
         }
         av_log(avctx, AV_LOG_INFO, "Output MediaFormat changed to %s\n", format);
         av_freep(&format);
 
         if ((ret = mediacodec_dec_parse_format(avctx, s)) < 0) {
             return ret;
         }
 
     } else if (ff_AMediaCodec_infoOutputBuffersChanged(codec, index)) {
         ff_AMediaCodec_cleanOutputBuffers(codec);
     } else if (ff_AMediaCodec_infoTryAgainLater(codec, index)) {
         if (s->draining) {
             av_log(avctx, AV_LOG_ERROR, "Failed to dequeue output buffer within %" PRIi64 "ms "
                                         "while draining remaining frames, output will probably lack frames\n",
                                         output_dequeue_timeout_us / 1000);
         } else {

             av_log(avctx, AV_LOG_TRACE, "No output buffer available, try again later\n");

         }
     } else {
         av_log(avctx, AV_LOG_ERROR, "Failed to dequeue output buffer (status=%zd)\n", index);
         return AVERROR_EXTERNAL;
     }
 

     return AVERROR(EAGAIN);

 }
 

 /*
 * ff_mediacodec_dec_flush returns 0 if the flush cannot be performed on
 * the codec (because the user retains frames). The codec stays in the
 * flushing state.
 *
 * ff_mediacodec_dec_flush returns 1 if the flush can actually be
 * performed on the codec. The codec leaves the flushing state and can
 * process again packets.
 *
 * ff_mediacodec_dec_flush returns a negative value if an error has
 * occurred.
 */

 int ff_mediacodec_dec_flush(AVCodecContext *avctx, MediaCodecDecContext *s)
 {

     if (!s->surface || atomic_load(&s->refcount) == 1) {

         int ret;
 
         /* No frames (holding a reference to the codec) are retained by the
          * user, thus we can flush the codec and returns accordingly */
         if ((ret = mediacodec_dec_flush_codec(avctx, s)) < 0) {
             return ret;
         }
 
         return 1;
     }
 
     s->flushing = 1;
     return 0;
 }
 
 int ff_mediacodec_dec_close(AVCodecContext *avctx, MediaCodecDecContext *s)
 {
     ff_mediacodec_dec_unref(s);
 
     return 0;
 }
 
 int ff_mediacodec_dec_is_flushing(AVCodecContext *avctx, MediaCodecDecContext *s)
 {
     return s->flushing;
 }