2 * Interface to libaacplus for aac+ (sbr+ps) encoding
3 * Copyright (c) 2010 tipok <piratfm@gmail.com>
5 * This file is part of FFmpeg.
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.
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.
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
24 * Interface to libaacplus for aac+ (sbr+ps) encoding.
32 typedef struct aacPlusAudioContext {
33 aacplusEncHandle aacplus_handle;
34 unsigned long max_output_bytes;
35 unsigned long samples_input;
36 } aacPlusAudioContext;
38 static av_cold int aacPlus_encode_init(AVCodecContext *avctx)
40 aacPlusAudioContext *s = avctx->priv_data;
41 aacplusEncConfiguration *aacplus_cfg;
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);
49 s->aacplus_handle = aacplusEncOpen(avctx->sample_rate, avctx->channels,
50 &s->samples_input, &s->max_output_bytes);
51 if(!s->aacplus_handle) {
52 av_log(avctx, AV_LOG_ERROR, "can't open encoder\n");
56 /* check aacplus version */
57 aacplus_cfg = aacplusEncGetCurrentConfiguration(s->aacplus_handle);
59 /* put the options in the configuration struct */
60 if(avctx->profile != FF_PROFILE_AAC_LOW && avctx->profile != FF_PROFILE_UNKNOWN) {
61 av_log(avctx, AV_LOG_ERROR, "invalid AAC profile: %d, only LC supported\n", avctx->profile);
62 aacplusEncClose(s->aacplus_handle);
66 aacplus_cfg->bitRate = avctx->bit_rate;
67 aacplus_cfg->bandWidth = avctx->cutoff;
68 aacplus_cfg->outputFormat = !(avctx->flags & CODEC_FLAG_GLOBAL_HEADER);
69 aacplus_cfg->inputFormat = AACPLUS_INPUT_16BIT;
70 if (!aacplusEncSetConfiguration(s->aacplus_handle, aacplus_cfg)) {
71 av_log(avctx, AV_LOG_ERROR, "libaacplus doesn't support this output format!\n");
75 avctx->frame_size = s->samples_input / avctx->channels;
77 #if FF_API_OLD_ENCODE_AUDIO
78 avctx->coded_frame= avcodec_alloc_frame();
79 avctx->coded_frame->key_frame= 1;
82 /* Set decoder specific info */
83 avctx->extradata_size = 0;
84 if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
86 unsigned char *buffer = NULL;
87 unsigned long decoder_specific_info_size;
89 if (aacplusEncGetDecoderSpecificInfo(s->aacplus_handle, &buffer,
90 &decoder_specific_info_size) == 1) {
91 avctx->extradata = av_malloc(decoder_specific_info_size + FF_INPUT_BUFFER_PADDING_SIZE);
92 avctx->extradata_size = decoder_specific_info_size;
93 memcpy(avctx->extradata, buffer, avctx->extradata_size);
100 static int aacPlus_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
101 const AVFrame *frame, int *got_packet)
103 aacPlusAudioContext *s = avctx->priv_data;
104 int32_t *input_buffer = (int32_t *)frame->data[0];
107 if ((ret = ff_alloc_packet2(avctx, pkt, s->max_output_bytes)) < 0)
110 pkt->size = aacplusEncEncode(s->aacplus_handle, input_buffer,
111 s->samples_input, pkt->data, pkt->size);
113 pkt->pts = frame->pts;
117 static av_cold int aacPlus_encode_close(AVCodecContext *avctx)
119 aacPlusAudioContext *s = avctx->priv_data;
121 #if FF_API_OLD_ENCODE_AUDIO
122 av_freep(&avctx->coded_frame);
124 av_freep(&avctx->extradata);
126 aacplusEncClose(s->aacplus_handle);
130 AVCodec ff_libaacplus_encoder = {
131 .name = "libaacplus",
132 .type = AVMEDIA_TYPE_AUDIO,
133 .id = AV_CODEC_ID_AAC,
134 .priv_data_size = sizeof(aacPlusAudioContext),
135 .init = aacPlus_encode_init,
136 .encode2 = aacPlus_encode_frame,
137 .close = aacPlus_encode_close,
138 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
139 AV_SAMPLE_FMT_NONE },
140 .long_name = NULL_IF_CONFIG_SMALL("libaacplus AAC+ (Advanced Audio Codec with SBR+PS)"),