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 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         return -1;
  43
  44     s->faac_handle = faacEncOpen(avctx->sample_rate,
  45                                  avctx->channels,
  46                                  &samples_input, &max_bytes_output);
  47
  48     /* check faac version */
  49     faac_cfg = faacEncGetCurrentConfiguration(s->faac_handle);
  50     if (faac_cfg->version != FAAC_CFG_VERSION) {
  51         av_log(avctx, AV_LOG_ERROR, "wrong libfaac version (compiled for: %d, using %d)\n", FAAC_CFG_VERSION, faac_cfg->version);
  52         faacEncClose(s->faac_handle);
  53         return -1;
  54     }
  55
  56     /* put the options in the configuration struct */
  57     switch(avctx->profile) {
  58         case FF_PROFILE_AAC_MAIN:
  59             faac_cfg->aacObjectType = MAIN;
  60             break;
  61         case FF_PROFILE_UNKNOWN:
  62         case FF_PROFILE_AAC_LOW:
  63             faac_cfg->aacObjectType = LOW;
  64             break;
  65         case FF_PROFILE_AAC_SSR:
  66             faac_cfg->aacObjectType = SSR;
  67             break;
  68         case FF_PROFILE_AAC_LTP:
  69             faac_cfg->aacObjectType = LTP;
  70             break;
  71         default:
  72             av_log(avctx, AV_LOG_ERROR, "invalid AAC profile\n");
  73             faacEncClose(s->faac_handle);
  74             return -1;
  75     }
  76     faac_cfg->mpegVersion = MPEG4;
  77     faac_cfg->useTns = 0;
  78     faac_cfg->allowMidside = 1;
  79     faac_cfg->bitRate = avctx->bit_rate / avctx->channels;
  80     faac_cfg->bandWidth = avctx->cutoff;
  81     if(avctx->flags & CODEC_FLAG_QSCALE) {
  82         faac_cfg->bitRate = 0;
  83         faac_cfg->quantqual = avctx->global_quality / FF_QP2LAMBDA;
  84     }
  85     faac_cfg->outputFormat = 1;
  86     faac_cfg->inputFormat = FAAC_INPUT_16BIT;
  87
  88     avctx->frame_size = samples_input / avctx->channels;
  89
  90     avctx->coded_frame= avcodec_alloc_frame();
  91     avctx->coded_frame->key_frame= 1;
  92
  93     /* Set decoder specific info */
  94     avctx->extradata_size = 0;
  95     if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
  96
  97         unsigned char *buffer = NULL;
  98         unsigned long decoder_specific_info_size;
  99
 100         if (!faacEncGetDecoderSpecificInfo(s->faac_handle, &buffer,
 101                                            &decoder_specific_info_size)) {
 102             avctx->extradata = av_malloc(decoder_specific_info_size + FF_INPUT_BUFFER_PADDING_SIZE);
 103             avctx->extradata_size = decoder_specific_info_size;
 104             memcpy(avctx->extradata, buffer, avctx->extradata_size);
 105             faac_cfg->outputFormat = 0;
 106         }
 107 #undef free
 108         free(buffer);
 109 #define free please_use_av_free
 110     }
 111
 112     if (!faacEncSetConfiguration(s->faac_handle, faac_cfg)) {
 113         av_log(avctx, AV_LOG_ERROR, "libfaac doesn't support this output format!\n");
 114         return -1;
 115     }
 116
 117     return 0;
 118 }
 119
 120 static int Faac_encode_frame(AVCodecContext *avctx,
 121                              unsigned char *frame, int buf_size, void *data)
 122 {
 123     FaacAudioContext *s = avctx->priv_data;
 124     int bytes_written;
 125
 126     bytes_written = faacEncEncode(s->faac_handle,
 127                                   data,
 128                                   avctx->frame_size * avctx->channels,
 129                                   frame,
 130                                   buf_size);
 131
 132     return bytes_written;
 133 }
 134
 135 static av_cold int Faac_encode_close(AVCodecContext *avctx)
 136 {
 137     FaacAudioContext *s = avctx->priv_data;
 138
 139     av_freep(&avctx->coded_frame);
 140     av_freep(&avctx->extradata);
 141
 142     faacEncClose(s->faac_handle);
 143     return 0;
 144 }
 145
 146 AVCodec libfaac_encoder = {
 147     "libfaac",
 148     CODEC_TYPE_AUDIO,
 149     CODEC_ID_AAC,
 150     sizeof(FaacAudioContext),
 151     Faac_encode_init,
 152     Faac_encode_frame,
 153     Faac_encode_close,
 154     .long_name = "libfaac AAC (Advanced Audio Codec)",
 155 };