/*
  * Interface to libaacplus for aac+ (sbr+ps) encoding
  * Copyright (c) 2010 tipok <piratfm@gmail.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
  */
 
 /**
  * @file
  * Interface to libaacplus for aac+ (sbr+ps) encoding.
  */
 
 #include <aacplus.h>
 

 #include "avcodec.h"
 #include "internal.h"
 

 typedef struct aacPlusAudioContext {
     aacplusEncHandle aacplus_handle;

     unsigned long max_output_bytes;
     unsigned long samples_input;

 } aacPlusAudioContext;
 
 static av_cold int aacPlus_encode_init(AVCodecContext *avctx)
 {
     aacPlusAudioContext *s = avctx->priv_data;
     aacplusEncConfiguration *aacplus_cfg;
 
     /* number of channels */
     if (avctx->channels < 1 || avctx->channels > 2) {
         av_log(avctx, AV_LOG_ERROR, "encoding %d channel(s) is not allowed\n", avctx->channels);

         return AVERROR(EINVAL);

     }
 

     if (avctx->profile != FF_PROFILE_AAC_LOW && avctx->profile != FF_PROFILE_UNKNOWN) {
         av_log(avctx, AV_LOG_ERROR, "invalid AAC profile: %d, only LC supported\n", avctx->profile);

         return AVERROR(EINVAL);

     }
 

     s->aacplus_handle = aacplusEncOpen(avctx->sample_rate, avctx->channels,
                                        &s->samples_input, &s->max_output_bytes);

     if (!s->aacplus_handle) {
         av_log(avctx, AV_LOG_ERROR, "can't open encoder\n");

         return AVERROR(EINVAL);

     }
 
     /* check aacplus version */
     aacplus_cfg = aacplusEncGetCurrentConfiguration(s->aacplus_handle);
 
     aacplus_cfg->bitRate = avctx->bit_rate;
     aacplus_cfg->bandWidth = avctx->cutoff;

     aacplus_cfg->outputFormat = !(avctx->flags & CODEC_FLAG_GLOBAL_HEADER);

     aacplus_cfg->inputFormat = avctx->sample_fmt == AV_SAMPLE_FMT_FLT ? AACPLUS_INPUT_FLOAT : AACPLUS_INPUT_16BIT;

     if (!aacplusEncSetConfiguration(s->aacplus_handle, aacplus_cfg)) {
         av_log(avctx, AV_LOG_ERROR, "libaacplus doesn't support this output format!\n");

         return AVERROR(EINVAL);

     }
 

     avctx->frame_size = s->samples_input / avctx->channels;

 
     /* Set decoder specific info */
     avctx->extradata_size = 0;
     if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
 
         unsigned char *buffer = NULL;
         unsigned long decoder_specific_info_size;
 
         if (aacplusEncGetDecoderSpecificInfo(s->aacplus_handle, &buffer,
                                            &decoder_specific_info_size) == 1) {
             avctx->extradata = av_malloc(decoder_specific_info_size + FF_INPUT_BUFFER_PADDING_SIZE);
             avctx->extradata_size = decoder_specific_info_size;
             memcpy(avctx->extradata, buffer, avctx->extradata_size);
         }
         free(buffer);
     }
     return 0;
 }
 

 static int aacPlus_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                                 const AVFrame *frame, int *got_packet)

 {
     aacPlusAudioContext *s = avctx->priv_data;

     int32_t *input_buffer = (int32_t *)frame->data[0];
     int ret;

     if ((ret = ff_alloc_packet2(avctx, pkt, s->max_output_bytes)) < 0)

         return ret;

     pkt->size = aacplusEncEncode(s->aacplus_handle, input_buffer,
                                  s->samples_input, pkt->data, pkt->size);
     *got_packet   = 1;
     pkt->pts      = frame->pts;
     return 0;

 }
 
 static av_cold int aacPlus_encode_close(AVCodecContext *avctx)
 {
     aacPlusAudioContext *s = avctx->priv_data;
 
     av_freep(&avctx->extradata);
     aacplusEncClose(s->aacplus_handle);

     return 0;
 }
 

 static const AVProfile profiles[] = {
     { FF_PROFILE_AAC_LOW, "LC" },
     { FF_PROFILE_UNKNOWN },
 };
 

 AVCodec ff_libaacplus_encoder = {

     .name           = "libaacplus",

     .long_name      = NULL_IF_CONFIG_SMALL("libaacplus AAC+ (Advanced Audio Codec with SBR+PS)"),

     .type           = AVMEDIA_TYPE_AUDIO,

     .id             = AV_CODEC_ID_AAC,

     .priv_data_size = sizeof(aacPlusAudioContext),
     .init           = aacPlus_encode_init,

     .encode2        = aacPlus_encode_frame,

     .close          = aacPlus_encode_close,

     .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,

                                                      AV_SAMPLE_FMT_FLT,

                                                      AV_SAMPLE_FMT_NONE },

     .profiles       = profiles,

     .channel_layouts = (const uint64_t[]) { AV_CH_LAYOUT_MONO,
                                             AV_CH_LAYOUT_STEREO,
                                             0 },

 };