2 * Interface to libfaac for aac encoding
3 * Copyright (c) 2002 Gildas Bazin <gbazin@netcourrier.com>
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; 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;
35 static av_cold int Faac_encode_close(AVCodecContext *avctx)
37 FaacAudioContext *s = avctx->priv_data;
39 av_freep(&avctx->coded_frame);
40 av_freep(&avctx->extradata);
43 faacEncClose(s->faac_handle);
47 static av_cold int Faac_encode_init(AVCodecContext *avctx)
49 FaacAudioContext *s = avctx->priv_data;
50 faacEncConfigurationPtr faac_cfg;
51 unsigned long samples_input, max_bytes_output;
54 /* number of channels */
55 if (avctx->channels < 1 || avctx->channels > 6) {
56 av_log(avctx, AV_LOG_ERROR, "encoding %d channel(s) is not allowed\n", avctx->channels);
57 ret = AVERROR(EINVAL);
61 s->faac_handle = faacEncOpen(avctx->sample_rate,
63 &samples_input, &max_bytes_output);
64 if (!s->faac_handle) {
65 av_log(avctx, AV_LOG_ERROR, "error in faacEncOpen()\n");
66 ret = AVERROR_UNKNOWN;
70 /* check faac version */
71 faac_cfg = faacEncGetCurrentConfiguration(s->faac_handle);
72 if (faac_cfg->version != FAAC_CFG_VERSION) {
73 av_log(avctx, AV_LOG_ERROR, "wrong libfaac version (compiled for: %d, using %d)\n", FAAC_CFG_VERSION, faac_cfg->version);
74 ret = AVERROR(EINVAL);
78 /* put the options in the configuration struct */
79 switch(avctx->profile) {
80 case FF_PROFILE_AAC_MAIN:
81 faac_cfg->aacObjectType = MAIN;
83 case FF_PROFILE_UNKNOWN:
84 case FF_PROFILE_AAC_LOW:
85 faac_cfg->aacObjectType = LOW;
87 case FF_PROFILE_AAC_SSR:
88 faac_cfg->aacObjectType = SSR;
90 case FF_PROFILE_AAC_LTP:
91 faac_cfg->aacObjectType = LTP;
94 av_log(avctx, AV_LOG_ERROR, "invalid AAC profile\n");
95 ret = AVERROR(EINVAL);
98 faac_cfg->mpegVersion = MPEG4;
100 faac_cfg->allowMidside = 1;
101 faac_cfg->bitRate = avctx->bit_rate / avctx->channels;
102 faac_cfg->bandWidth = avctx->cutoff;
103 if(avctx->flags & CODEC_FLAG_QSCALE) {
104 faac_cfg->bitRate = 0;
105 faac_cfg->quantqual = avctx->global_quality / FF_QP2LAMBDA;
107 faac_cfg->outputFormat = 1;
108 faac_cfg->inputFormat = FAAC_INPUT_16BIT;
110 avctx->frame_size = samples_input / avctx->channels;
112 avctx->coded_frame= avcodec_alloc_frame();
113 if (!avctx->coded_frame) {
114 ret = AVERROR(ENOMEM);
118 /* Set decoder specific info */
119 avctx->extradata_size = 0;
120 if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
122 unsigned char *buffer = NULL;
123 unsigned long decoder_specific_info_size;
125 if (!faacEncGetDecoderSpecificInfo(s->faac_handle, &buffer,
126 &decoder_specific_info_size)) {
127 avctx->extradata = av_malloc(decoder_specific_info_size + FF_INPUT_BUFFER_PADDING_SIZE);
128 if (!avctx->extradata) {
129 ret = AVERROR(ENOMEM);
132 avctx->extradata_size = decoder_specific_info_size;
133 memcpy(avctx->extradata, buffer, avctx->extradata_size);
134 faac_cfg->outputFormat = 0;
138 #define free please_use_av_free
141 if (!faacEncSetConfiguration(s->faac_handle, faac_cfg)) {
142 av_log(avctx, AV_LOG_ERROR, "libfaac doesn't support this output format!\n");
143 ret = AVERROR(EINVAL);
149 Faac_encode_close(avctx);
153 static int Faac_encode_frame(AVCodecContext *avctx,
154 unsigned char *frame, int buf_size, void *data)
156 FaacAudioContext *s = avctx->priv_data;
158 int num_samples = data ? avctx->frame_size : 0;
160 bytes_written = faacEncEncode(s->faac_handle,
162 num_samples * avctx->channels,
166 return bytes_written;
169 static const AVProfile profiles[] = {
170 { FF_PROFILE_AAC_MAIN, "Main" },
171 { FF_PROFILE_AAC_LOW, "LC" },
172 { FF_PROFILE_AAC_SSR, "SSR" },
173 { FF_PROFILE_AAC_LTP, "LTP" },
174 { FF_PROFILE_UNKNOWN },
177 AVCodec ff_libfaac_encoder = {
179 .type = AVMEDIA_TYPE_AUDIO,
181 .priv_data_size = sizeof(FaacAudioContext),
182 .init = Faac_encode_init,
183 .encode = Faac_encode_frame,
184 .close = Faac_encode_close,
185 .capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY,
186 .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
187 .long_name = NULL_IF_CONFIG_SMALL("libfaac AAC (Advanced Audio Codec)"),
188 .profiles = NULL_IF_CONFIG_SMALL(profiles),