libavcodec/libfaac.c

   1 /*
   2  * Interface to libfaac for aac encoding
   3  * Copyright (c) 2002 Gildas Bazin <gbazin@netcourrier.com>
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file libavcodec/libfaac.c
  24  * Interface to libfaac for aac encoding.
  25  */
  26
  27 #include "avcodec.h"
  28 #include <faac.h>
  29
  30 typedef struct FaacAudioContext {
  31     faacEncHandle faac_handle;
  32 } FaacAudioContext;
  33
  34 static av_cold int Faac_encode_init(AVCodecContext *avctx)
  35 {
  36     FaacAudioContext *s = avctx->priv_data;
  37     faacEncConfigurationPtr faac_cfg;
  38     unsigned long samples_input, max_bytes_output;
  39
  40     /* number of channels */
  41     if (avctx->channels < 1 || avctx->channels > 6) {
  42         av_log(avctx, AV_LOG_ERROR, "encoding %d channel(s) is not allowed\n", avctx->channels);
  43         return -1;
  44     }
  45
  46     s->faac_handle = faacEncOpen(avctx->sample_rate,
  47                                  avctx->channels,
  48                                  &samples_input, &max_bytes_output);
  49
  50     /* check faac version */
  51     faac_cfg = faacEncGetCurrentConfiguration(s->faac_handle);
  52     if (faac_cfg->version != FAAC_CFG_VERSION) {
  53         av_log(avctx, AV_LOG_ERROR, "wrong libfaac version (compiled for: %d, using %d)\n", FAAC_CFG_VERSION, faac_cfg->version);
  54         faacEncClose(s->faac_handle);
  55         return -1;
  56     }
  57
  58     /* put the options in the configuration struct */
  59     switch(avctx->profile) {
  60         case FF_PROFILE_AAC_MAIN:
  61             faac_cfg->aacObjectType = MAIN;
  62             break;
  63         case FF_PROFILE_UNKNOWN:
  64         case FF_PROFILE_AAC_LOW:
  65             faac_cfg->aacObjectType = LOW;
  66             break;
  67         case FF_PROFILE_AAC_SSR:
  68             faac_cfg->aacObjectType = SSR;
  69             break;
  70         case FF_PROFILE_AAC_LTP:
  71             faac_cfg->aacObjectType = LTP;
  72             break;
  73         default:
  74             av_log(avctx, AV_LOG_ERROR, "invalid AAC profile\n");
  75             faacEncClose(s->faac_handle);
  76             return -1;
  77     }
  78     faac_cfg->mpegVersion = MPEG4;
  79     faac_cfg->useTns = 0;
  80     faac_cfg->allowMidside = 1;
  81     faac_cfg->bitRate = avctx->bit_rate / avctx->channels;
  82     faac_cfg->bandWidth = avctx->cutoff;
  83     if(avctx->flags & CODEC_FLAG_QSCALE) {
  84         faac_cfg->bitRate = 0;
  85         faac_cfg->quantqual = avctx->global_quality / FF_QP2LAMBDA;
  86     }
  87     faac_cfg->outputFormat = 1;
  88     faac_cfg->inputFormat = FAAC_INPUT_16BIT;
  89
  90     avctx->frame_size = samples_input / avctx->channels;
  91
  92     avctx->coded_frame= avcodec_alloc_frame();
  93     avctx->coded_frame->key_frame= 1;
  94
  95     /* Set decoder specific info */
  96     avctx->extradata_size = 0;
  97     if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
  98
  99         unsigned char *buffer = NULL;
 100         unsigned long decoder_specific_info_size;
 101
 102         if (!faacEncGetDecoderSpecificInfo(s->faac_handle, &buffer,
 103                                            &decoder_specific_info_size)) {
 104             avctx->extradata = av_malloc(decoder_specific_info_size + FF_INPUT_BUFFER_PADDING_SIZE);
 105             avctx->extradata_size = decoder_specific_info_size;
 106             memcpy(avctx->extradata, buffer, avctx->extradata_size);
 107             faac_cfg->outputFormat = 0;
 108         }
 109 #undef free
 110         free(buffer);
 111 #define free please_use_av_free
 112     }
 113
 114     if (!faacEncSetConfiguration(s->faac_handle, faac_cfg)) {
 115         av_log(avctx, AV_LOG_ERROR, "libfaac doesn't support this output format!\n");
 116         return -1;
 117     }
 118
 119     return 0;
 120 }
 121
 122 static int Faac_encode_frame(AVCodecContext *avctx,
 123                              unsigned char *frame, int buf_size, void *data)
 124 {
 125     FaacAudioContext *s = avctx->priv_data;
 126     int bytes_written;
 127
 128     bytes_written = faacEncEncode(s->faac_handle,
 129                                   data,
 130                                   avctx->frame_size * avctx->channels,
 131                                   frame,
 132                                   buf_size);
 133
 134     return bytes_written;
 135 }
 136
 137 static av_cold int Faac_encode_close(AVCodecContext *avctx)
 138 {
 139     FaacAudioContext *s = avctx->priv_data;
 140
 141     av_freep(&avctx->coded_frame);
 142     av_freep(&avctx->extradata);
 143
 144     faacEncClose(s->faac_handle);
 145     return 0;
 146 }
 147
 148 AVCodec libfaac_encoder = {
 149     "libfaac",
 150     CODEC_TYPE_AUDIO,
 151     CODEC_ID_AAC,
 152     sizeof(FaacAudioContext),
 153     Faac_encode_init,
 154     Faac_encode_frame,
 155     Faac_encode_close,
 156     .sample_fmts = (const enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
 157     .long_name = NULL_IF_CONFIG_SMALL("libfaac AAC (Advanced Audio Codec)"),
 158 };