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  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. };
  142.