2 * Interface to libfaac for aac encoding
3 * Copyright (c) 2002 Gildas Bazin <gbazin@netcourrier.com>
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 * Interface to libfaac for aac encoding.
28 typedef struct FaacAudioContext {
29 faacEncHandle faac_handle;
32 static int Faac_encode_init(AVCodecContext *avctx)
34 FaacAudioContext *s = avctx->priv_data;
35 faacEncConfigurationPtr faac_cfg;
36 unsigned long samples_input, max_bytes_output;
38 /* number of channels */
39 if (avctx->channels < 1 || avctx->channels > 6)
42 s->faac_handle = faacEncOpen(avctx->sample_rate,
44 &samples_input, &max_bytes_output);
46 /* check faac version */
47 faac_cfg = faacEncGetCurrentConfiguration(s->faac_handle);
48 if (faac_cfg->version != FAAC_CFG_VERSION) {
49 av_log(avctx, AV_LOG_ERROR, "wrong libfaac version (compiled for: %d, using %d)\n", FAAC_CFG_VERSION, faac_cfg->version);
50 faacEncClose(s->faac_handle);
54 /* put the options in the configuration struct */
55 faac_cfg->aacObjectType = LOW;
56 faac_cfg->mpegVersion = MPEG4;
58 faac_cfg->allowMidside = 1;
59 faac_cfg->bitRate = avctx->bit_rate / avctx->channels;
60 faac_cfg->bandWidth = avctx->cutoff;
61 if(avctx->flags & CODEC_FLAG_QSCALE) {
62 faac_cfg->bitRate = 0;
63 faac_cfg->quantqual = avctx->global_quality / FF_QP2LAMBDA;
65 faac_cfg->outputFormat = 0;
66 faac_cfg->inputFormat = FAAC_INPUT_16BIT;
68 if (!faacEncSetConfiguration(s->faac_handle, faac_cfg)) {
69 av_log(avctx, AV_LOG_ERROR, "libfaac doesn't support this output format!\n");
73 avctx->frame_size = samples_input / avctx->channels;
75 avctx->coded_frame= avcodec_alloc_frame();
76 avctx->coded_frame->key_frame= 1;
78 /* Set decoder specific info */
79 avctx->extradata_size = 0;
80 if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
82 unsigned char *buffer;
83 unsigned long decoder_specific_info_size;
85 if (!faacEncGetDecoderSpecificInfo(s->faac_handle, &buffer,
86 &decoder_specific_info_size)) {
87 avctx->extradata = buffer;
88 avctx->extradata_size = decoder_specific_info_size;
95 int Faac_encode_frame(AVCodecContext *avctx,
96 unsigned char *frame, int buf_size, void *data)
98 FaacAudioContext *s = avctx->priv_data;
101 bytes_written = faacEncEncode(s->faac_handle,
103 avctx->frame_size * avctx->channels,
107 return bytes_written;
110 int Faac_encode_close(AVCodecContext *avctx)
112 FaacAudioContext *s = avctx->priv_data;
114 av_freep(&avctx->coded_frame);
116 //if (avctx->extradata_size) free(avctx->extradata);
118 faacEncClose(s->faac_handle);
122 AVCodec faac_encoder = {
126 sizeof(FaacAudioContext),