| 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 | |
| 170 | avctx->delay = FAAC_DELAY_SAMPLES; |
| 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 | }; |