2 * Interface to libfaac for aac encoding
3 * Copyright (c) 2002 Gildas Bazin <gbazin@netcourrier.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 libfaac for aac encoding.
30 typedef struct FaacAudioContext {
31 faacEncHandle faac_handle;
34 static int Faac_encode_init(AVCodecContext *avctx)
36 FaacAudioContext *s = avctx->priv_data;
37 faacEncConfigurationPtr faac_cfg;
38 unsigned long samples_input, max_bytes_output;
40 /* number of channels */
41 if (avctx->channels < 1 || avctx->channels > 6)
44 s->faac_handle = faacEncOpen(avctx->sample_rate,
46 &samples_input, &max_bytes_output);
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);
56 /* put the options in the configuration struct */
57 faac_cfg->aacObjectType = LOW;
58 faac_cfg->mpegVersion = MPEG4;
60 faac_cfg->allowMidside = 1;
61 faac_cfg->bitRate = avctx->bit_rate / avctx->channels;
62 faac_cfg->bandWidth = avctx->cutoff;
63 if(avctx->flags & CODEC_FLAG_QSCALE) {
64 faac_cfg->bitRate = 0;
65 faac_cfg->quantqual = avctx->global_quality / FF_QP2LAMBDA;
67 faac_cfg->outputFormat = 1;
68 faac_cfg->inputFormat = FAAC_INPUT_16BIT;
70 avctx->frame_size = samples_input / avctx->channels;
72 avctx->coded_frame= avcodec_alloc_frame();
73 avctx->coded_frame->key_frame= 1;
75 /* Set decoder specific info */
76 avctx->extradata_size = 0;
77 if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
79 unsigned char *buffer;
80 unsigned long decoder_specific_info_size;
82 if (!faacEncGetDecoderSpecificInfo(s->faac_handle, &buffer,
83 &decoder_specific_info_size)) {
84 avctx->extradata = buffer;
85 avctx->extradata_size = decoder_specific_info_size;
86 faac_cfg->outputFormat = 0;
90 if (!faacEncSetConfiguration(s->faac_handle, faac_cfg)) {
91 av_log(avctx, AV_LOG_ERROR, "libfaac doesn't support this output format!\n");
98 int Faac_encode_frame(AVCodecContext *avctx,
99 unsigned char *frame, int buf_size, void *data)
101 FaacAudioContext *s = avctx->priv_data;
104 bytes_written = faacEncEncode(s->faac_handle,
106 avctx->frame_size * avctx->channels,
110 return bytes_written;
113 int Faac_encode_close(AVCodecContext *avctx)
115 FaacAudioContext *s = avctx->priv_data;
117 av_freep(&avctx->coded_frame);
119 //if (avctx->extradata_size) free(avctx->extradata);
121 faacEncClose(s->faac_handle);
125 AVCodec faac_encoder = {
129 sizeof(FaacAudioContext),