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 #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 const int channel_maps[][6] = {
61 { 2, 0, 1 }, //< C L R
62 { 2, 0, 1, 3 }, //< C L R Cs
63 { 2, 0, 1, 3, 4 }, //< C L R Ls Rs
64 { 2, 0, 1, 4, 5, 3 }, //< C L R Ls Rs LFE
67 static av_cold int Faac_encode_init(AVCodecContext *avctx)
69 FaacAudioContext *s = avctx->priv_data;
70 faacEncConfigurationPtr faac_cfg;
71 unsigned long samples_input, max_bytes_output;
74 /* number of channels */
75 if (avctx->channels < 1 || avctx->channels > 6) {
76 av_log(avctx, AV_LOG_ERROR, "encoding %d channel(s) is not allowed\n", avctx->channels);
77 ret = AVERROR(EINVAL);
81 s->faac_handle = faacEncOpen(avctx->sample_rate,
83 &samples_input, &max_bytes_output);
84 if (!s->faac_handle) {
85 av_log(avctx, AV_LOG_ERROR, "error in faacEncOpen()\n");
86 ret = AVERROR_UNKNOWN;
90 /* check faac version */
91 faac_cfg = faacEncGetCurrentConfiguration(s->faac_handle);
92 if (faac_cfg->version != FAAC_CFG_VERSION) {
93 av_log(avctx, AV_LOG_ERROR, "wrong libfaac version (compiled for: %d, using %d)\n", FAAC_CFG_VERSION, faac_cfg->version);
94 ret = AVERROR(EINVAL);
98 /* put the options in the configuration struct */
99 switch(avctx->profile) {
100 case FF_PROFILE_AAC_MAIN:
101 faac_cfg->aacObjectType = MAIN;
103 case FF_PROFILE_UNKNOWN:
104 case FF_PROFILE_AAC_LOW:
105 faac_cfg->aacObjectType = LOW;
107 case FF_PROFILE_AAC_SSR:
108 faac_cfg->aacObjectType = SSR;
110 case FF_PROFILE_AAC_LTP:
111 faac_cfg->aacObjectType = LTP;
114 av_log(avctx, AV_LOG_ERROR, "invalid AAC profile\n");
115 ret = AVERROR(EINVAL);
118 faac_cfg->mpegVersion = MPEG4;
119 faac_cfg->useTns = 0;
120 faac_cfg->allowMidside = 1;
121 faac_cfg->bitRate = avctx->bit_rate / avctx->channels;
122 faac_cfg->bandWidth = avctx->cutoff;
123 if(avctx->flags & CODEC_FLAG_QSCALE) {
124 faac_cfg->bitRate = 0;
125 faac_cfg->quantqual = avctx->global_quality / FF_QP2LAMBDA;
127 faac_cfg->outputFormat = 1;
128 faac_cfg->inputFormat = FAAC_INPUT_16BIT;
129 if (avctx->channels > 2)
130 memcpy(faac_cfg->channel_map, channel_maps[avctx->channels-3],
131 avctx->channels * sizeof(int));
133 avctx->frame_size = samples_input / avctx->channels;
135 #if FF_API_OLD_ENCODE_AUDIO
136 avctx->coded_frame= avcodec_alloc_frame();
137 if (!avctx->coded_frame) {
138 ret = AVERROR(ENOMEM);
143 /* Set decoder specific info */
144 avctx->extradata_size = 0;
145 if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
147 unsigned char *buffer = NULL;
148 unsigned long decoder_specific_info_size;
150 if (!faacEncGetDecoderSpecificInfo(s->faac_handle, &buffer,
151 &decoder_specific_info_size)) {
152 avctx->extradata = av_malloc(decoder_specific_info_size + FF_INPUT_BUFFER_PADDING_SIZE);
153 if (!avctx->extradata) {
154 ret = AVERROR(ENOMEM);
157 avctx->extradata_size = decoder_specific_info_size;
158 memcpy(avctx->extradata, buffer, avctx->extradata_size);
159 faac_cfg->outputFormat = 0;
164 if (!faacEncSetConfiguration(s->faac_handle, faac_cfg)) {
165 av_log(avctx, AV_LOG_ERROR, "libfaac doesn't support this output format!\n");
166 ret = AVERROR(EINVAL);
170 avctx->delay = 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))) {
188 av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
192 bytes_written = faacEncEncode(s->faac_handle, samples,
193 num_samples * avctx->channels,
194 avpkt->data, avpkt->size);
195 if (bytes_written < 0) {
196 av_log(avctx, AV_LOG_ERROR, "faacEncEncode() error\n");
197 return bytes_written;
200 /* add current frame to the queue */
202 if ((ret = ff_af_queue_add(&s->afq, frame) < 0))
209 /* Get the next frame pts/duration */
210 ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
213 avpkt->size = bytes_written;
218 static const AVProfile profiles[] = {
219 { FF_PROFILE_AAC_MAIN, "Main" },
220 { FF_PROFILE_AAC_LOW, "LC" },
221 { FF_PROFILE_AAC_SSR, "SSR" },
222 { FF_PROFILE_AAC_LTP, "LTP" },
223 { FF_PROFILE_UNKNOWN },
226 static const uint64_t faac_channel_layouts[] = {
229 AV_CH_LAYOUT_SURROUND,
230 AV_CH_LAYOUT_4POINT0,
231 AV_CH_LAYOUT_5POINT0_BACK,
232 AV_CH_LAYOUT_5POINT1_BACK,
236 AVCodec ff_libfaac_encoder = {
238 .type = AVMEDIA_TYPE_AUDIO,
239 .id = AV_CODEC_ID_AAC,
240 .priv_data_size = sizeof(FaacAudioContext),
241 .init = Faac_encode_init,
242 .encode2 = Faac_encode_frame,
243 .close = Faac_encode_close,
244 .capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY,
245 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
246 AV_SAMPLE_FMT_NONE },
247 .long_name = NULL_IF_CONFIG_SMALL("libfaac AAC (Advanced Audio Coding)"),
248 .profiles = NULL_IF_CONFIG_SMALL(profiles),
249 .channel_layouts = faac_channel_layouts,