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 #include "audio_frame_queue.h"
32 #include "libavutil/audioconvert.h"
35 /* libfaac has an encoder delay of 1024 samples */
36 #define FAAC_DELAY_SAMPLES 1024
38 typedef struct FaacAudioContext {
39 faacEncHandle faac_handle;
44 static av_cold int Faac_encode_close(AVCodecContext *avctx)
46 FaacAudioContext *s = avctx->priv_data;
48 #if FF_API_OLD_ENCODE_AUDIO
49 av_freep(&avctx->coded_frame);
51 av_freep(&avctx->extradata);
52 ff_af_queue_close(&s->afq);
55 faacEncClose(s->faac_handle);
60 static av_cold int Faac_encode_init(AVCodecContext *avctx)
62 FaacAudioContext *s = avctx->priv_data;
63 faacEncConfigurationPtr faac_cfg;
64 unsigned long samples_input, max_bytes_output;
67 /* number of channels */
68 if (avctx->channels < 1 || avctx->channels > 6) {
69 av_log(avctx, AV_LOG_ERROR, "encoding %d channel(s) is not allowed\n", avctx->channels);
70 ret = AVERROR(EINVAL);
74 s->faac_handle = faacEncOpen(avctx->sample_rate,
76 &samples_input, &max_bytes_output);
77 if (!s->faac_handle) {
78 av_log(avctx, AV_LOG_ERROR, "error in faacEncOpen()\n");
79 ret = AVERROR_UNKNOWN;
83 /* check faac version */
84 faac_cfg = faacEncGetCurrentConfiguration(s->faac_handle);
85 if (faac_cfg->version != FAAC_CFG_VERSION) {
86 av_log(avctx, AV_LOG_ERROR, "wrong libfaac version (compiled for: %d, using %d)\n", FAAC_CFG_VERSION, faac_cfg->version);
87 ret = AVERROR(EINVAL);
91 /* put the options in the configuration struct */
92 switch(avctx->profile) {
93 case FF_PROFILE_AAC_MAIN:
94 faac_cfg->aacObjectType = MAIN;
96 case FF_PROFILE_UNKNOWN:
97 case FF_PROFILE_AAC_LOW:
98 faac_cfg->aacObjectType = LOW;
100 case FF_PROFILE_AAC_SSR:
101 faac_cfg->aacObjectType = SSR;
103 case FF_PROFILE_AAC_LTP:
104 faac_cfg->aacObjectType = LTP;
107 av_log(avctx, AV_LOG_ERROR, "invalid AAC profile\n");
108 ret = AVERROR(EINVAL);
111 faac_cfg->mpegVersion = MPEG4;
112 faac_cfg->useTns = 0;
113 faac_cfg->allowMidside = 1;
114 faac_cfg->bitRate = avctx->bit_rate / avctx->channels;
115 faac_cfg->bandWidth = avctx->cutoff;
116 if(avctx->flags & CODEC_FLAG_QSCALE) {
117 faac_cfg->bitRate = 0;
118 faac_cfg->quantqual = avctx->global_quality / FF_QP2LAMBDA;
120 faac_cfg->outputFormat = 1;
121 faac_cfg->inputFormat = FAAC_INPUT_16BIT;
123 avctx->frame_size = samples_input / avctx->channels;
125 #if FF_API_OLD_ENCODE_AUDIO
126 avctx->coded_frame= avcodec_alloc_frame();
127 if (!avctx->coded_frame) {
128 ret = AVERROR(ENOMEM);
133 /* Set decoder specific info */
134 avctx->extradata_size = 0;
135 if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
137 unsigned char *buffer = NULL;
138 unsigned long decoder_specific_info_size;
140 if (!faacEncGetDecoderSpecificInfo(s->faac_handle, &buffer,
141 &decoder_specific_info_size)) {
142 avctx->extradata = av_malloc(decoder_specific_info_size + FF_INPUT_BUFFER_PADDING_SIZE);
143 if (!avctx->extradata) {
144 ret = AVERROR(ENOMEM);
147 avctx->extradata_size = decoder_specific_info_size;
148 memcpy(avctx->extradata, buffer, avctx->extradata_size);
149 faac_cfg->outputFormat = 0;
153 #define free please_use_av_free
156 if (!faacEncSetConfiguration(s->faac_handle, faac_cfg)) {
157 av_log(avctx, AV_LOG_ERROR, "libfaac doesn't support this output format!\n");
158 ret = AVERROR(EINVAL);
162 avctx->delay = FAAC_DELAY_SAMPLES;
163 ff_af_queue_init(avctx, &s->afq);
167 Faac_encode_close(avctx);
171 static int Faac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
172 const AVFrame *frame, int *got_packet_ptr)
174 FaacAudioContext *s = avctx->priv_data;
175 int bytes_written, ret;
176 int num_samples = frame ? frame->nb_samples : 0;
177 void *samples = frame ? frame->data[0] : NULL;
179 if ((ret = ff_alloc_packet(avpkt, (7 + 768) * avctx->channels))) {
180 av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
184 bytes_written = faacEncEncode(s->faac_handle, samples,
185 num_samples * avctx->channels,
186 avpkt->data, avpkt->size);
187 if (bytes_written < 0) {
188 av_log(avctx, AV_LOG_ERROR, "faacEncEncode() error\n");
189 return bytes_written;
192 /* add current frame to the queue */
194 if ((ret = ff_af_queue_add(&s->afq, frame) < 0))
201 /* Get the next frame pts/duration */
202 ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
205 avpkt->size = bytes_written;
210 static const AVProfile profiles[] = {
211 { FF_PROFILE_AAC_MAIN, "Main" },
212 { FF_PROFILE_AAC_LOW, "LC" },
213 { FF_PROFILE_AAC_SSR, "SSR" },
214 { FF_PROFILE_AAC_LTP, "LTP" },
215 { FF_PROFILE_UNKNOWN },
218 static const uint64_t faac_channel_layouts[] = {
221 AV_CH_LAYOUT_SURROUND,
222 AV_CH_LAYOUT_4POINT0,
223 AV_CH_LAYOUT_5POINT0_BACK,
224 AV_CH_LAYOUT_5POINT1_BACK,
228 AVCodec ff_libfaac_encoder = {
230 .type = AVMEDIA_TYPE_AUDIO,
232 .priv_data_size = sizeof(FaacAudioContext),
233 .init = Faac_encode_init,
234 .encode2 = Faac_encode_frame,
235 .close = Faac_encode_close,
236 .capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY,
237 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
238 AV_SAMPLE_FMT_NONE },
239 .long_name = NULL_IF_CONFIG_SMALL("libfaac AAC (Advanced Audio Codec)"),
240 .profiles = NULL_IF_CONFIG_SMALL(profiles),
241 .channel_layouts = faac_channel_layouts,