/*
  * Interface to libfaac for aac encoding
  * Copyright (c) 2002 Gildas Bazin <gbazin@netcourrier.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 libfaac for aac encoding.
  */
 
 #include "avcodec.h"
 #include <faac.h>
 
 typedef struct FaacAudioContext {
     faacEncHandle faac_handle;
 } FaacAudioContext;
 

 static const int channel_maps[][6] = {
     { 2, 0, 1 },          //< C L R
     { 2, 0, 1, 3 },       //< C L R Cs
     { 2, 0, 1, 3, 4 },    //< C L R Ls Rs
     { 2, 0, 1, 4, 5, 3 }, //< C L R Ls Rs LFE
 };
 

 static av_cold int Faac_encode_init(AVCodecContext *avctx)

 {
     FaacAudioContext *s = avctx->priv_data;
     faacEncConfigurationPtr faac_cfg;
     unsigned long samples_input, max_bytes_output;
 
     /* number of channels */

     if (avctx->channels < 1 || avctx->channels > 6) {
         av_log(avctx, AV_LOG_ERROR, "encoding %d channel(s) is not allowed\n", avctx->channels);

         return -1;

     }

 
     s->faac_handle = faacEncOpen(avctx->sample_rate,
                                  avctx->channels,
                                  &samples_input, &max_bytes_output);
 
     /* check faac version */
     faac_cfg = faacEncGetCurrentConfiguration(s->faac_handle);
     if (faac_cfg->version != FAAC_CFG_VERSION) {

         av_log(avctx, AV_LOG_ERROR, "wrong libfaac version (compiled for: %d, using %d)\n", FAAC_CFG_VERSION, faac_cfg->version);

         faacEncClose(s->faac_handle);
         return -1;
     }
 
     /* put the options in the configuration struct */

     switch(avctx->profile) {
         case FF_PROFILE_AAC_MAIN:
             faac_cfg->aacObjectType = MAIN;
             break;
         case FF_PROFILE_UNKNOWN:
         case FF_PROFILE_AAC_LOW:
             faac_cfg->aacObjectType = LOW;
             break;
         case FF_PROFILE_AAC_SSR:
             faac_cfg->aacObjectType = SSR;
             break;
         case FF_PROFILE_AAC_LTP:
             faac_cfg->aacObjectType = LTP;
             break;
         default:
             av_log(avctx, AV_LOG_ERROR, "invalid AAC profile\n");
             faacEncClose(s->faac_handle);
             return -1;
     }

     faac_cfg->mpegVersion = MPEG4;
     faac_cfg->useTns = 0;
     faac_cfg->allowMidside = 1;

     faac_cfg->bitRate = avctx->bit_rate / avctx->channels;

     faac_cfg->bandWidth = avctx->cutoff;

     if(avctx->flags & CODEC_FLAG_QSCALE) {
         faac_cfg->bitRate = 0;
         faac_cfg->quantqual = avctx->global_quality / FF_QP2LAMBDA;
     }

     faac_cfg->outputFormat = 1;

     faac_cfg->inputFormat = FAAC_INPUT_16BIT;

     if (avctx->channels > 2)
         memcpy(faac_cfg->channel_map, channel_maps[avctx->channels-3],
                avctx->channels * sizeof(int));

 
     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 (!faacEncGetDecoderSpecificInfo(s->faac_handle, &buffer,
                                            &decoder_specific_info_size)) {

             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);

             faac_cfg->outputFormat = 0;

         }

 #undef free
         free(buffer);
 #define free please_use_av_free

     }
 

     if (!faacEncSetConfiguration(s->faac_handle, faac_cfg)) {
         av_log(avctx, AV_LOG_ERROR, "libfaac doesn't support this output format!\n");
         return -1;
     }
 

     return 0;
 }
 

 static int Faac_encode_frame(AVCodecContext *avctx,
                              unsigned char *frame, int buf_size, void *data)

 {
     FaacAudioContext *s = avctx->priv_data;
     int bytes_written;

     int num_samples = data ? avctx->frame_size : 0;

 
     bytes_written = faacEncEncode(s->faac_handle,
                                   data,

                                   num_samples * avctx->channels,

                                   frame,
                                   buf_size);
 
     return bytes_written;
 }
 

 static av_cold int Faac_encode_close(AVCodecContext *avctx)

 {
     FaacAudioContext *s = avctx->priv_data;
 
     av_freep(&avctx->coded_frame);

     av_freep(&avctx->extradata);

 
     faacEncClose(s->faac_handle);
     return 0;
 }
 

 static const AVProfile profiles[] = {
     { FF_PROFILE_AAC_MAIN, "Main" },
     { FF_PROFILE_AAC_LOW,  "LC"   },
     { FF_PROFILE_AAC_SSR,  "SSR"  },
     { FF_PROFILE_AAC_LTP,  "LTP"  },
     { FF_PROFILE_UNKNOWN },
 };
 

 AVCodec ff_libfaac_encoder = {

     "libfaac",

     AVMEDIA_TYPE_AUDIO,

     CODEC_ID_AAC,
     sizeof(FaacAudioContext),
     Faac_encode_init,
     Faac_encode_frame,

     Faac_encode_close,

     .capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY,

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

     .long_name = NULL_IF_CONFIG_SMALL("libfaac AAC (Advanced Audio Codec)"),

     .profiles = NULL_IF_CONFIG_SMALL(profiles),

 };