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.
29 #include "libavutil/channel_layout.h"
30 #include "libavutil/common.h"
32 #include "audio_frame_queue.h"
36 /* libfaac has an encoder delay of 1024 samples */
37 #define FAAC_DELAY_SAMPLES 1024
39 typedef struct FaacAudioContext {
40 faacEncHandle faac_handle;
44 static av_cold int Faac_encode_close(AVCodecContext *avctx)
46 FaacAudioContext *s = avctx->priv_data;
48 av_freep(&avctx->extradata);
49 ff_af_queue_close(&s->afq);
52 faacEncClose(s->faac_handle);
57 static const int channel_maps[][6] = {
58 { 2, 0, 1 }, //< C L R
59 { 2, 0, 1, 3 }, //< C L R Cs
60 { 2, 0, 1, 3, 4 }, //< C L R Ls Rs
61 { 2, 0, 1, 4, 5, 3 }, //< C L R Ls Rs LFE
64 static av_cold int Faac_encode_init(AVCodecContext *avctx)
66 FaacAudioContext *s = avctx->priv_data;
67 faacEncConfigurationPtr faac_cfg;
68 unsigned long samples_input, max_bytes_output;
71 /* number of channels */
72 if (avctx->channels < 1 || avctx->channels > 6) {
73 av_log(avctx, AV_LOG_ERROR, "encoding %d channel(s) is not allowed\n", avctx->channels);
74 ret = AVERROR(EINVAL);
78 s->faac_handle = faacEncOpen(avctx->sample_rate,
80 &samples_input, &max_bytes_output);
81 if (!s->faac_handle) {
82 av_log(avctx, AV_LOG_ERROR, "error in faacEncOpen()\n");
83 ret = AVERROR_UNKNOWN;
87 /* check faac version */
88 faac_cfg = faacEncGetCurrentConfiguration(s->faac_handle);
89 if (faac_cfg->version != FAAC_CFG_VERSION) {
90 av_log(avctx, AV_LOG_ERROR, "wrong libfaac version (compiled for: %d, using %d)\n", FAAC_CFG_VERSION, faac_cfg->version);
91 ret = AVERROR(EINVAL);
95 /* put the options in the configuration struct */
96 switch(avctx->profile) {
97 case FF_PROFILE_AAC_MAIN:
98 faac_cfg->aacObjectType = MAIN;
100 case FF_PROFILE_UNKNOWN:
101 case FF_PROFILE_AAC_LOW:
102 faac_cfg->aacObjectType = LOW;
104 case FF_PROFILE_AAC_SSR:
105 faac_cfg->aacObjectType = SSR;
107 case FF_PROFILE_AAC_LTP:
108 faac_cfg->aacObjectType = LTP;
111 av_log(avctx, AV_LOG_ERROR, "invalid AAC profile\n");
112 ret = AVERROR(EINVAL);
115 faac_cfg->mpegVersion = MPEG4;
116 faac_cfg->useTns = 0;
117 faac_cfg->allowMidside = 1;
118 faac_cfg->bitRate = avctx->bit_rate / avctx->channels;
119 faac_cfg->bandWidth = avctx->cutoff;
120 if(avctx->flags & CODEC_FLAG_QSCALE) {
121 faac_cfg->bitRate = 0;
122 faac_cfg->quantqual = avctx->global_quality / FF_QP2LAMBDA;
124 faac_cfg->outputFormat = 1;
125 faac_cfg->inputFormat = FAAC_INPUT_16BIT;
126 if (avctx->channels > 2)
127 memcpy(faac_cfg->channel_map, channel_maps[avctx->channels-3],
128 avctx->channels * sizeof(int));
130 avctx->frame_size = samples_input / avctx->channels;
132 /* Set decoder specific info */
133 avctx->extradata_size = 0;
134 if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
136 unsigned char *buffer = NULL;
137 unsigned long decoder_specific_info_size;
139 if (!faacEncGetDecoderSpecificInfo(s->faac_handle, &buffer,
140 &decoder_specific_info_size)) {
141 avctx->extradata = av_malloc(decoder_specific_info_size + FF_INPUT_BUFFER_PADDING_SIZE);
142 if (!avctx->extradata) {
143 ret = AVERROR(ENOMEM);
146 avctx->extradata_size = decoder_specific_info_size;
147 memcpy(avctx->extradata, buffer, avctx->extradata_size);
148 faac_cfg->outputFormat = 0;
153 if (!faacEncSetConfiguration(s->faac_handle, faac_cfg)) {
155 for (i = avctx->bit_rate/1000; i ; i--) {
156 faac_cfg->bitRate = 1000*i / avctx->channels;
157 if (faacEncSetConfiguration(s->faac_handle, faac_cfg))
161 av_log(avctx, AV_LOG_ERROR, "libfaac doesn't support this output format!\n");
162 ret = AVERROR(EINVAL);
165 avctx->bit_rate = 1000*i;
166 av_log(avctx, AV_LOG_WARNING, "libfaac doesn't support the specified bitrate, using %dkbit/s instead\n", i);
170 avctx->initial_padding = FAAC_DELAY_SAMPLES;
171 ff_af_queue_init(avctx, &s->afq);
175 Faac_encode_close(avctx);
179 static int Faac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
180 const AVFrame *frame, int *got_packet_ptr)
182 FaacAudioContext *s = avctx->priv_data;
183 int bytes_written, ret;
184 int num_samples = frame ? frame->nb_samples : 0;
185 void *samples = frame ? frame->data[0] : NULL;
187 if ((ret = ff_alloc_packet2(avctx, avpkt, (7 + 768) * avctx->channels)) < 0)
190 bytes_written = faacEncEncode(s->faac_handle, samples,
191 num_samples * avctx->channels,
192 avpkt->data, avpkt->size);
193 if (bytes_written < 0) {
194 av_log(avctx, AV_LOG_ERROR, "faacEncEncode() error\n");
195 return bytes_written;
198 /* add current frame to the queue */
200 if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
207 /* Get the next frame pts/duration */
208 ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
211 avpkt->size = bytes_written;
216 static const AVProfile profiles[] = {
217 { FF_PROFILE_AAC_MAIN, "Main" },
218 { FF_PROFILE_AAC_LOW, "LC" },
219 { FF_PROFILE_AAC_SSR, "SSR" },
220 { FF_PROFILE_AAC_LTP, "LTP" },
221 { FF_PROFILE_UNKNOWN },
224 static const uint64_t faac_channel_layouts[] = {
227 AV_CH_LAYOUT_SURROUND,
228 AV_CH_LAYOUT_4POINT0,
229 AV_CH_LAYOUT_5POINT0_BACK,
230 AV_CH_LAYOUT_5POINT1_BACK,
234 AVCodec ff_libfaac_encoder = {
236 .long_name = NULL_IF_CONFIG_SMALL("libfaac AAC (Advanced Audio Coding)"),
237 .type = AVMEDIA_TYPE_AUDIO,
238 .id = AV_CODEC_ID_AAC,
239 .priv_data_size = sizeof(FaacAudioContext),
240 .init = Faac_encode_init,
241 .encode2 = Faac_encode_frame,
242 .close = Faac_encode_close,
243 .capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY,
244 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
245 AV_SAMPLE_FMT_NONE },
246 .profiles = NULL_IF_CONFIG_SMALL(profiles),
247 .channel_layouts = faac_channel_layouts,