ffmpeg/libavcodec/libaacplus.c

   1 /*
   2  * Interface to libaacplus for aac+ (sbr+ps) encoding
   3  * Copyright (c) 2010 tipok <piratfm@gmail.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
  24  * Interface to libaacplus for aac+ (sbr+ps) encoding.
  25  */
  26
  27 #include <aacplus.h>
  28
  29 #include "avcodec.h"
  30 #include "internal.h"
  31
  32 typedef struct aacPlusAudioContext {
  33     aacplusEncHandle aacplus_handle;
  34     unsigned long max_output_bytes;
  35     unsigned long samples_input;
  36 } aacPlusAudioContext;
  37
  38 static av_cold int aacPlus_encode_init(AVCodecContext *avctx)
  39 {
  40     aacPlusAudioContext *s = avctx->priv_data;
  41     aacplusEncConfiguration *aacplus_cfg;
  42
  43     /* number of channels */
  44     if (avctx->channels < 1 || avctx->channels > 2) {
  45         av_log(avctx, AV_LOG_ERROR, "encoding %d channel(s) is not allowed\n", avctx->channels);
  46         return AVERROR(EINVAL);
  47     }
  48
  49     if (avctx->profile != FF_PROFILE_AAC_LOW && avctx->profile != FF_PROFILE_UNKNOWN) {
  50         av_log(avctx, AV_LOG_ERROR, "invalid AAC profile: %d, only LC supported\n", avctx->profile);
  51         return AVERROR(EINVAL);
  52     }
  53
  54     s->aacplus_handle = aacplusEncOpen(avctx->sample_rate, avctx->channels,
  55                                        &s->samples_input, &s->max_output_bytes);
  56     if (!s->aacplus_handle) {
  57         av_log(avctx, AV_LOG_ERROR, "can't open encoder\n");
  58         return AVERROR(EINVAL);
  59     }
  60
  61     /* check aacplus version */
  62     aacplus_cfg = aacplusEncGetCurrentConfiguration(s->aacplus_handle);
  63
  64     aacplus_cfg->bitRate = avctx->bit_rate;
  65     aacplus_cfg->bandWidth = avctx->cutoff;
  66     aacplus_cfg->outputFormat = !(avctx->flags & CODEC_FLAG_GLOBAL_HEADER);
  67     aacplus_cfg->inputFormat = avctx->sample_fmt == AV_SAMPLE_FMT_FLT ? AACPLUS_INPUT_FLOAT : AACPLUS_INPUT_16BIT;
  68     if (!aacplusEncSetConfiguration(s->aacplus_handle, aacplus_cfg)) {
  69         av_log(avctx, AV_LOG_ERROR, "libaacplus doesn't support this output format!\n");
  70         return AVERROR(EINVAL);
  71     }
  72
  73     avctx->frame_size = s->samples_input / avctx->channels;
  74
  75     /* Set decoder specific info */
  76     avctx->extradata_size = 0;
  77     if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
  78
  79         unsigned char *buffer = NULL;
  80         unsigned long decoder_specific_info_size;
  81
  82         if (aacplusEncGetDecoderSpecificInfo(s->aacplus_handle, &buffer,
  83                                            &decoder_specific_info_size) == 1) {
  84             avctx->extradata = av_malloc(decoder_specific_info_size + FF_INPUT_BUFFER_PADDING_SIZE);
  85             avctx->extradata_size = decoder_specific_info_size;
  86             memcpy(avctx->extradata, buffer, avctx->extradata_size);
  87         }
  88         free(buffer);
  89     }
  90     return 0;
  91 }
  92
  93 static int aacPlus_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
  94                                 const AVFrame *frame, int *got_packet)
  95 {
  96     aacPlusAudioContext *s = avctx->priv_data;
  97     int32_t *input_buffer = (int32_t *)frame->data[0];
  98     int ret;
  99
 100     if ((ret = ff_alloc_packet2(avctx, pkt, s->max_output_bytes)) < 0)
 101         return ret;
 102
 103     pkt->size = aacplusEncEncode(s->aacplus_handle, input_buffer,
 104                                  s->samples_input, pkt->data, pkt->size);
 105     *got_packet   = 1;
 106     pkt->pts      = frame->pts;
 107     return 0;
 108 }
 109
 110 static av_cold int aacPlus_encode_close(AVCodecContext *avctx)
 111 {
 112     aacPlusAudioContext *s = avctx->priv_data;
 113
 114     av_freep(&avctx->extradata);
 115     aacplusEncClose(s->aacplus_handle);
 116
 117     return 0;
 118 }
 119
 120 static const AVProfile profiles[] = {
 121     { FF_PROFILE_AAC_LOW, "LC" },
 122     { FF_PROFILE_UNKNOWN },
 123 };
 124
 125 AVCodec ff_libaacplus_encoder = {
 126     .name           = "libaacplus",
 127     .long_name      = NULL_IF_CONFIG_SMALL("libaacplus AAC+ (Advanced Audio Codec with SBR+PS)"),
 128     .type           = AVMEDIA_TYPE_AUDIO,
 129     .id             = AV_CODEC_ID_AAC,
 130     .priv_data_size = sizeof(aacPlusAudioContext),
 131     .init           = aacPlus_encode_init,
 132     .encode2        = aacPlus_encode_frame,
 133     .close          = aacPlus_encode_close,
 134     .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
 135                                                      AV_SAMPLE_FMT_FLT,
 136                                                      AV_SAMPLE_FMT_NONE },
 137     .profiles       = profiles,
 138     .channel_layouts = (const uint64_t[]) { AV_CH_LAYOUT_MONO,
 139                                             AV_CH_LAYOUT_STEREO,
 140                                             0 },
 141 };