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1 | /* |
2 | * Interface to libfaac for aac encoding | |
3 | * Copyright (c) 2002 Gildas Bazin <gbazin@netcourrier.com> | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
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. | |
11 | * | |
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. | |
16 | * | |
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 | |
20 | */ | |
21 | ||
22 | /** | |
23 | * @file | |
24 | * Interface to libfaac for aac encoding. | |
25 | */ | |
26 | ||
27 | #include <faac.h> | |
28 | ||
29 | #include "libavutil/channel_layout.h" | |
30 | #include "libavutil/common.h" | |
31 | #include "avcodec.h" | |
32 | #include "audio_frame_queue.h" | |
33 | #include "internal.h" | |
34 | ||
35 | ||
36 | /* libfaac has an encoder delay of 1024 samples */ | |
37 | #define FAAC_DELAY_SAMPLES 1024 | |
38 | ||
39 | typedef struct FaacAudioContext { | |
40 | faacEncHandle faac_handle; | |
41 | AudioFrameQueue afq; | |
42 | } FaacAudioContext; | |
43 | ||
44 | static av_cold int Faac_encode_close(AVCodecContext *avctx) | |
45 | { | |
46 | FaacAudioContext *s = avctx->priv_data; | |
47 | ||
48 | av_freep(&avctx->extradata); | |
49 | ff_af_queue_close(&s->afq); | |
50 | ||
51 | if (s->faac_handle) | |
52 | faacEncClose(s->faac_handle); | |
53 | ||
54 | return 0; | |
55 | } | |
56 | ||
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 | |
62 | }; | |
63 | ||
64 | static av_cold int Faac_encode_init(AVCodecContext *avctx) | |
65 | { | |
66 | FaacAudioContext *s = avctx->priv_data; | |
67 | faacEncConfigurationPtr faac_cfg; | |
68 | unsigned long samples_input, max_bytes_output; | |
69 | int ret; | |
70 | ||
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); | |
75 | goto error; | |
76 | } | |
77 | ||
78 | s->faac_handle = faacEncOpen(avctx->sample_rate, | |
79 | avctx->channels, | |
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; | |
84 | goto error; | |
85 | } | |
86 | ||
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); | |
92 | goto error; | |
93 | } | |
94 | ||
95 | /* put the options in the configuration struct */ | |
96 | switch(avctx->profile) { | |
97 | case FF_PROFILE_AAC_MAIN: | |
98 | faac_cfg->aacObjectType = MAIN; | |
99 | break; | |
100 | case FF_PROFILE_UNKNOWN: | |
101 | case FF_PROFILE_AAC_LOW: | |
102 | faac_cfg->aacObjectType = LOW; | |
103 | break; | |
104 | case FF_PROFILE_AAC_SSR: | |
105 | faac_cfg->aacObjectType = SSR; | |
106 | break; | |
107 | case FF_PROFILE_AAC_LTP: | |
108 | faac_cfg->aacObjectType = LTP; | |
109 | break; | |
110 | default: | |
111 | av_log(avctx, AV_LOG_ERROR, "invalid AAC profile\n"); | |
112 | ret = AVERROR(EINVAL); | |
113 | goto error; | |
114 | } | |
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; | |
123 | } | |
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)); | |
129 | ||
130 | avctx->frame_size = samples_input / avctx->channels; | |
131 | ||
132 | /* Set decoder specific info */ | |
133 | avctx->extradata_size = 0; | |
134 | if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) { | |
135 | ||
136 | unsigned char *buffer = NULL; | |
137 | unsigned long decoder_specific_info_size; | |
138 | ||
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); | |
144 | goto error; | |
145 | } | |
146 | avctx->extradata_size = decoder_specific_info_size; | |
147 | memcpy(avctx->extradata, buffer, avctx->extradata_size); | |
148 | faac_cfg->outputFormat = 0; | |
149 | } | |
150 | free(buffer); | |
151 | } | |
152 | ||
153 | if (!faacEncSetConfiguration(s->faac_handle, faac_cfg)) { | |
154 | int i; | |
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)) | |
158 | break; | |
159 | } | |
160 | if (!i) { | |
161 | av_log(avctx, AV_LOG_ERROR, "libfaac doesn't support this output format!\n"); | |
162 | ret = AVERROR(EINVAL); | |
163 | goto error; | |
164 | } else { | |
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); | |
167 | } | |
168 | } | |
169 | ||
f6fa7814 | 170 | avctx->initial_padding = FAAC_DELAY_SAMPLES; |
2ba45a60 DM |
171 | ff_af_queue_init(avctx, &s->afq); |
172 | ||
173 | return 0; | |
174 | error: | |
175 | Faac_encode_close(avctx); | |
176 | return ret; | |
177 | } | |
178 | ||
179 | static int Faac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, | |
180 | const AVFrame *frame, int *got_packet_ptr) | |
181 | { | |
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; | |
186 | ||
187 | if ((ret = ff_alloc_packet2(avctx, avpkt, (7 + 768) * avctx->channels)) < 0) | |
188 | return ret; | |
189 | ||
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; | |
196 | } | |
197 | ||
198 | /* add current frame to the queue */ | |
199 | if (frame) { | |
200 | if ((ret = ff_af_queue_add(&s->afq, frame)) < 0) | |
201 | return ret; | |
202 | } | |
203 | ||
204 | if (!bytes_written) | |
205 | return 0; | |
206 | ||
207 | /* Get the next frame pts/duration */ | |
208 | ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts, | |
209 | &avpkt->duration); | |
210 | ||
211 | avpkt->size = bytes_written; | |
212 | *got_packet_ptr = 1; | |
213 | return 0; | |
214 | } | |
215 | ||
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 }, | |
222 | }; | |
223 | ||
224 | static const uint64_t faac_channel_layouts[] = { | |
225 | AV_CH_LAYOUT_MONO, | |
226 | AV_CH_LAYOUT_STEREO, | |
227 | AV_CH_LAYOUT_SURROUND, | |
228 | AV_CH_LAYOUT_4POINT0, | |
229 | AV_CH_LAYOUT_5POINT0_BACK, | |
230 | AV_CH_LAYOUT_5POINT1_BACK, | |
231 | 0 | |
232 | }; | |
233 | ||
234 | AVCodec ff_libfaac_encoder = { | |
235 | .name = "libfaac", | |
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, | |
248 | }; |