/*
  * 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 "avcodec.h"
 #include <aacplus.h>
 
 typedef struct aacPlusAudioContext {
     aacplusEncHandle aacplus_handle;
 } aacPlusAudioContext;
 
 static av_cold int aacPlus_encode_init(AVCodecContext *avctx)
 {
     aacPlusAudioContext *s = avctx->priv_data;
     aacplusEncConfiguration *aacplus_cfg;
     unsigned long samples_input, max_bytes_output;
 
     /* 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 -1;
     }
 
     s->aacplus_handle = aacplusEncOpen(avctx->sample_rate,
                                  avctx->channels,
                                  &samples_input, &max_bytes_output);
     if(!s->aacplus_handle) {
             av_log(avctx, AV_LOG_ERROR, "can't open encoder\n");
             return -1;
     }
 
     /* check aacplus version */
     aacplus_cfg = aacplusEncGetCurrentConfiguration(s->aacplus_handle);
 
     /* put the options in the configuration struct */
     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);
             aacplusEncClose(s->aacplus_handle);
             return -1;
     }
 
     aacplus_cfg->bitRate = avctx->bit_rate;
     aacplus_cfg->bandWidth = avctx->cutoff;

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

     aacplus_cfg->inputFormat = 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 -1;
     }
 
     avctx->frame_size = samples_input / avctx->channels;
 
     avctx->coded_frame= avcodec_alloc_frame();
     avctx->coded_frame->key_frame= 1;
 
     /* 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);
         }
 #undef free
         free(buffer);
 #define free please_use_av_free
     }
     return 0;
 }
 
 static int aacPlus_encode_frame(AVCodecContext *avctx,
                              unsigned char *frame, int buf_size, void *data)
 {
     aacPlusAudioContext *s = avctx->priv_data;
     int bytes_written;
 
     bytes_written = aacplusEncEncode(s->aacplus_handle,
                                   data,
                                   avctx->frame_size * avctx->channels,
                                   frame,
                                   buf_size);
 
     return bytes_written;
 }
 
 static av_cold int aacPlus_encode_close(AVCodecContext *avctx)
 {
     aacPlusAudioContext *s = avctx->priv_data;
 
     av_freep(&avctx->coded_frame);
     av_freep(&avctx->extradata);
 
     aacplusEncClose(s->aacplus_handle);
     return 0;
 }
 
 AVCodec ff_libaacplus_encoder = {
     "libaacplus",
     AVMEDIA_TYPE_AUDIO,
     CODEC_ID_AAC,
     sizeof(aacPlusAudioContext),
     aacPlus_encode_init,
     aacPlus_encode_frame,
     aacPlus_encode_close,
     .sample_fmts = (const enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
     .long_name = NULL_IF_CONFIG_SMALL("libaacplus AAC+ (Advanced Audio Codec with SBR+PS)"),
 };