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 #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;
43 static av_cold int Faac_encode_close(AVCodecContext *avctx)
45 FaacAudioContext *s = avctx->priv_data;
47 #if FF_API_OLD_ENCODE_AUDIO
48 av_freep(&avctx->coded_frame);
50 av_freep(&avctx->extradata);
51 ff_af_queue_close(&s->afq);
54 faacEncClose(s->faac_handle);
59 static const int channel_maps[][6] = {
60 { 2, 0, 1 }, //< C L R
61 { 2, 0, 1, 3 }, //< C L R Cs
62 { 2, 0, 1, 3, 4 }, //< C L R Ls Rs
63 { 2, 0, 1, 4, 5, 3 }, //< C L R Ls Rs LFE
66 static av_cold int Faac_encode_init(AVCodecContext *avctx)
68 FaacAudioContext *s = avctx->priv_data;
69 faacEncConfigurationPtr faac_cfg;
70 unsigned long samples_input, max_bytes_output;
73 /* number of channels */
74 if (avctx->channels < 1 || avctx->channels > 6) {
75 av_log(avctx, AV_LOG_ERROR, "encoding %d channel(s) is not allowed\n", avctx->channels);
76 ret = AVERROR(EINVAL);
80 s->faac_handle = faacEncOpen(avctx->sample_rate,
82 &samples_input, &max_bytes_output);
83 if (!s->faac_handle) {
84 av_log(avctx, AV_LOG_ERROR, "error in faacEncOpen()\n");
85 ret = AVERROR_UNKNOWN;
89 /* check faac version */
90 faac_cfg = faacEncGetCurrentConfiguration(s->faac_handle);
91 if (faac_cfg->version != FAAC_CFG_VERSION) {
92 av_log(avctx, AV_LOG_ERROR, "wrong libfaac version (compiled for: %d, using %d)\n", FAAC_CFG_VERSION, faac_cfg->version);
93 ret = AVERROR(EINVAL);
97 /* put the options in the configuration struct */
98 switch(avctx->profile) {
99 case FF_PROFILE_AAC_MAIN:
100 faac_cfg->aacObjectType = MAIN;
102 case FF_PROFILE_UNKNOWN:
103 case FF_PROFILE_AAC_LOW:
104 faac_cfg->aacObjectType = LOW;
106 case FF_PROFILE_AAC_SSR:
107 faac_cfg->aacObjectType = SSR;
109 case FF_PROFILE_AAC_LTP:
110 faac_cfg->aacObjectType = LTP;
113 av_log(avctx, AV_LOG_ERROR, "invalid AAC profile\n");
114 ret = AVERROR(EINVAL);
117 faac_cfg->mpegVersion = MPEG4;
118 faac_cfg->useTns = 0;
119 faac_cfg->allowMidside = 1;
120 faac_cfg->bitRate = avctx->bit_rate / avctx->channels;
121 faac_cfg->bandWidth = avctx->cutoff;
122 if(avctx->flags & CODEC_FLAG_QSCALE) {
123 faac_cfg->bitRate = 0;
124 faac_cfg->quantqual = avctx->global_quality / FF_QP2LAMBDA;
126 faac_cfg->outputFormat = 1;
127 faac_cfg->inputFormat = FAAC_INPUT_16BIT;
128 if (avctx->channels > 2)
129 memcpy(faac_cfg->channel_map, channel_maps[avctx->channels-3],
130 avctx->channels * sizeof(int));
132 avctx->frame_size = samples_input / avctx->channels;
134 #if FF_API_OLD_ENCODE_AUDIO
135 avctx->coded_frame= avcodec_alloc_frame();
136 if (!avctx->coded_frame) {
137 ret = AVERROR(ENOMEM);
142 /* Set decoder specific info */
143 avctx->extradata_size = 0;
144 if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
146 unsigned char *buffer = NULL;
147 unsigned long decoder_specific_info_size;
149 if (!faacEncGetDecoderSpecificInfo(s->faac_handle, &buffer,
150 &decoder_specific_info_size)) {
151 avctx->extradata = av_malloc(decoder_specific_info_size + FF_INPUT_BUFFER_PADDING_SIZE);
152 if (!avctx->extradata) {
153 ret = AVERROR(ENOMEM);
156 avctx->extradata_size = decoder_specific_info_size;
157 memcpy(avctx->extradata, buffer, avctx->extradata_size);
158 faac_cfg->outputFormat = 0;
162 #define free please_use_av_free
165 if (!faacEncSetConfiguration(s->faac_handle, faac_cfg)) {
166 av_log(avctx, AV_LOG_ERROR, "libfaac doesn't support this output format!\n");
167 ret = AVERROR(EINVAL);
171 avctx->delay = FAAC_DELAY_SAMPLES;
172 ff_af_queue_init(avctx, &s->afq);
176 Faac_encode_close(avctx);
180 static int Faac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
181 const AVFrame *frame, int *got_packet_ptr)
183 FaacAudioContext *s = avctx->priv_data;
184 int bytes_written, ret;
185 int num_samples = frame ? frame->nb_samples : 0;
186 void *samples = frame ? frame->data[0] : NULL;
188 if ((ret = ff_alloc_packet2(avctx, avpkt, (7 + 768) * avctx->channels))) {
189 av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
193 bytes_written = faacEncEncode(s->faac_handle, samples,
194 num_samples * avctx->channels,
195 avpkt->data, avpkt->size);
196 if (bytes_written < 0) {
197 av_log(avctx, AV_LOG_ERROR, "faacEncEncode() error\n");
198 return bytes_written;
201 /* add current frame to the queue */
203 if ((ret = ff_af_queue_add(&s->afq, frame) < 0))
210 /* Get the next frame pts/duration */
211 ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
214 avpkt->size = bytes_written;
219 static const AVProfile profiles[] = {
220 { FF_PROFILE_AAC_MAIN, "Main" },
221 { FF_PROFILE_AAC_LOW, "LC" },
222 { FF_PROFILE_AAC_SSR, "SSR" },
223 { FF_PROFILE_AAC_LTP, "LTP" },
224 { FF_PROFILE_UNKNOWN },
227 static const uint64_t faac_channel_layouts[] = {
230 AV_CH_LAYOUT_SURROUND,
231 AV_CH_LAYOUT_4POINT0,
232 AV_CH_LAYOUT_5POINT0_BACK,
233 AV_CH_LAYOUT_5POINT1_BACK,
237 AVCodec ff_libfaac_encoder = {
239 .type = AVMEDIA_TYPE_AUDIO,
241 .priv_data_size = sizeof(FaacAudioContext),
242 .init = Faac_encode_init,
243 .encode2 = Faac_encode_frame,
244 .close = Faac_encode_close,
245 .capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY,
246 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
247 AV_SAMPLE_FMT_NONE },
248 .long_name = NULL_IF_CONFIG_SMALL("libfaac AAC (Advanced Audio Codec)"),
249 .profiles = NULL_IF_CONFIG_SMALL(profiles),
250 .channel_layouts = faac_channel_layouts,