libavcodec/libfaac.c

   1 /*
   2  * Interface to libfaac for aac encoding
   3  * Copyright (c) 2002 Gildas Bazin <gbazin@netcourrier.com>
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; 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
  45 static av_cold int Faac_encode_close(AVCodecContext *avctx)
  46 {
  47     FaacAudioContext *s = avctx->priv_data;
  48
  49 #if FF_API_OLD_ENCODE_AUDIO
  50     av_freep(&avctx->coded_frame);
  51 #endif
  52     av_freep(&avctx->extradata);
  53     ff_af_queue_close(&s->afq);
  54
  55     if (s->faac_handle)
  56         faacEncClose(s->faac_handle);
  57
  58     return 0;
  59 }
  60
  61 static const int channel_maps[][6] = {
  62     { 2, 0, 1 },          //< C L R
  63     { 2, 0, 1, 3 },       //< C L R Cs
  64     { 2, 0, 1, 3, 4 },    //< C L R Ls Rs
  65     { 2, 0, 1, 4, 5, 3 }, //< C L R Ls Rs LFE
  66 };
  67
  68 static av_cold int Faac_encode_init(AVCodecContext *avctx)
  69 {
  70     FaacAudioContext *s = avctx->priv_data;
  71     faacEncConfigurationPtr faac_cfg;
  72     unsigned long samples_input, max_bytes_output;
  73     int ret;
  74
  75     /* number of channels */
  76     if (avctx->channels < 1 || avctx->channels > 6) {
  77         av_log(avctx, AV_LOG_ERROR, "encoding %d channel(s) is not allowed\n", avctx->channels);
  78         ret = AVERROR(EINVAL);
  79         goto error;
  80     }
  81
  82     s->faac_handle = faacEncOpen(avctx->sample_rate,
  83                                  avctx->channels,
  84                                  &samples_input, &max_bytes_output);
  85     if (!s->faac_handle) {
  86         av_log(avctx, AV_LOG_ERROR, "error in faacEncOpen()\n");
  87         ret = AVERROR_UNKNOWN;
  88         goto error;
  89     }
  90
  91     /* check faac version */
  92     faac_cfg = faacEncGetCurrentConfiguration(s->faac_handle);
  93     if (faac_cfg->version != FAAC_CFG_VERSION) {
  94         av_log(avctx, AV_LOG_ERROR, "wrong libfaac version (compiled for: %d, using %d)\n", FAAC_CFG_VERSION, faac_cfg->version);
  95         ret = AVERROR(EINVAL);
  96         goto error;
  97     }
  98
  99     /* put the options in the configuration struct */
 100     switch(avctx->profile) {
 101         case FF_PROFILE_AAC_MAIN:
 102             faac_cfg->aacObjectType = MAIN;
 103             break;
 104         case FF_PROFILE_UNKNOWN:
 105         case FF_PROFILE_AAC_LOW:
 106             faac_cfg->aacObjectType = LOW;
 107             break;
 108         case FF_PROFILE_AAC_SSR:
 109             faac_cfg->aacObjectType = SSR;
 110             break;
 111         case FF_PROFILE_AAC_LTP:
 112             faac_cfg->aacObjectType = LTP;
 113             break;
 114         default:
 115             av_log(avctx, AV_LOG_ERROR, "invalid AAC profile\n");
 116             ret = AVERROR(EINVAL);
 117             goto error;
 118     }
 119     faac_cfg->mpegVersion = MPEG4;
 120     faac_cfg->useTns = 0;
 121     faac_cfg->allowMidside = 1;
 122     faac_cfg->bitRate = avctx->bit_rate / avctx->channels;
 123     faac_cfg->bandWidth = avctx->cutoff;
 124     if(avctx->flags & CODEC_FLAG_QSCALE) {
 125         faac_cfg->bitRate = 0;
 126         faac_cfg->quantqual = avctx->global_quality / FF_QP2LAMBDA;
 127     }
 128     faac_cfg->outputFormat = 1;
 129     faac_cfg->inputFormat = FAAC_INPUT_16BIT;
 130     if (avctx->channels > 2)
 131         memcpy(faac_cfg->channel_map, channel_maps[avctx->channels-3],
 132                avctx->channels * sizeof(int));
 133
 134     avctx->frame_size = samples_input / avctx->channels;
 135
 136 #if FF_API_OLD_ENCODE_AUDIO
 137     avctx->coded_frame= avcodec_alloc_frame();
 138     if (!avctx->coded_frame) {
 139         ret = AVERROR(ENOMEM);
 140         goto error;
 141     }
 142 #endif
 143
 144     /* Set decoder specific info */
 145     avctx->extradata_size = 0;
 146     if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
 147
 148         unsigned char *buffer = NULL;
 149         unsigned long decoder_specific_info_size;
 150
 151         if (!faacEncGetDecoderSpecificInfo(s->faac_handle, &buffer,
 152                                            &decoder_specific_info_size)) {
 153             avctx->extradata = av_malloc(decoder_specific_info_size + FF_INPUT_BUFFER_PADDING_SIZE);
 154             if (!avctx->extradata) {
 155                 ret = AVERROR(ENOMEM);
 156                 goto error;
 157             }
 158             avctx->extradata_size = decoder_specific_info_size;
 159             memcpy(avctx->extradata, buffer, avctx->extradata_size);
 160             faac_cfg->outputFormat = 0;
 161         }
 162         free(buffer);
 163     }
 164
 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);
 168         goto error;
 169     }
 170
 171     avctx->delay = FAAC_DELAY_SAMPLES;
 172     ff_af_queue_init(avctx, &s->afq);
 173
 174     return 0;
 175 error:
 176     Faac_encode_close(avctx);
 177     return ret;
 178 }
 179
 180 static int Faac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
 181                              const AVFrame *frame, int *got_packet_ptr)
 182 {
 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;
 187
 188     if ((ret = ff_alloc_packet(avpkt, (7 + 768) * avctx->channels))) {
 189         av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
 190         return ret;
 191     }
 192
 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;
 199     }
 200
 201     /* add current frame to the queue */
 202     if (frame) {
 203         if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
 204             return ret;
 205     }
 206
 207     if (!bytes_written)
 208         return 0;
 209
 210     /* Get the next frame pts/duration */
 211     ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
 212                        &avpkt->duration);
 213
 214     avpkt->size = bytes_written;
 215     *got_packet_ptr = 1;
 216     return 0;
 217 }
 218
 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 },
 225 };
 226
 227 static const uint64_t faac_channel_layouts[] = {
 228     AV_CH_LAYOUT_MONO,
 229     AV_CH_LAYOUT_STEREO,
 230     AV_CH_LAYOUT_SURROUND,
 231     AV_CH_LAYOUT_4POINT0,
 232     AV_CH_LAYOUT_5POINT0_BACK,
 233     AV_CH_LAYOUT_5POINT1_BACK,
 234     0
 235 };
 236
 237 AVCodec ff_libfaac_encoder = {
 238     .name           = "libfaac",
 239     .type           = AVMEDIA_TYPE_AUDIO,
 240     .id             = AV_CODEC_ID_AAC,
 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 Coding)"),
 249     .profiles       = NULL_IF_CONFIG_SMALL(profiles),
 250     .channel_layouts = faac_channel_layouts,
 251 };