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  1. /*
  2.  * AAC encoder wrapper
  3.  * Copyright (c) 2012 Martin Storsjo
  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. #include <fdk-aac/aacenc_lib.h>
  23.  
  24. #include "libavutil/channel_layout.h"
  25. #include "libavutil/common.h"
  26. #include "libavutil/opt.h"
  27. #include "avcodec.h"
  28. #include "audio_frame_queue.h"
  29. #include "internal.h"
  30.  
  31. typedef struct AACContext {
  32.     const AVClass *class;
  33.     HANDLE_AACENCODER handle;
  34.     int afterburner;
  35.     int eld_sbr;
  36.     int signaling;
  37.     int latm;
  38.     int header_period;
  39.     int vbr;
  40.  
  41.     AudioFrameQueue afq;
  42. } AACContext;
  43.  
  44. static const AVOption aac_enc_options[] = {
  45.     { "afterburner", "Afterburner (improved quality)", offsetof(AACContext, afterburner), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
  46.     { "eld_sbr", "Enable SBR for ELD (for SBR in other configurations, use the -profile parameter)", offsetof(AACContext, eld_sbr), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
  47.     { "signaling", "SBR/PS signaling style", offsetof(AACContext, signaling), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 2, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM, "signaling" },
  48.     { "default", "Choose signaling implicitly (explicit hierarchical by default, implicit if global header is disabled)", 0, AV_OPT_TYPE_CONST, { .i64 = -1 }, 0, 0, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM, "signaling" },
  49.     { "implicit", "Implicit backwards compatible signaling", 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, 0, 0, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM, "signaling" },
  50.     { "explicit_sbr", "Explicit SBR, implicit PS signaling", 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, 0, 0, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM, "signaling" },
  51.     { "explicit_hierarchical", "Explicit hierarchical signaling", 0, AV_OPT_TYPE_CONST, { .i64 = 2 }, 0, 0, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM, "signaling" },
  52.     { "latm", "Output LATM/LOAS encapsulated data", offsetof(AACContext, latm), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
  53.     { "header_period", "StreamMuxConfig and PCE repetition period (in frames)", offsetof(AACContext, header_period), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 0xffff, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
  54.     { "vbr", "VBR mode (1-5)", offsetof(AACContext, vbr), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 5, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
  55.     { NULL }
  56. };
  57.  
  58. static const AVClass aac_enc_class = {
  59.     "libfdk_aac", av_default_item_name, aac_enc_options, LIBAVUTIL_VERSION_INT
  60. };
  61.  
  62. static const char *aac_get_error(AACENC_ERROR err)
  63. {
  64.     switch (err) {
  65.     case AACENC_OK:
  66.         return "No error";
  67.     case AACENC_INVALID_HANDLE:
  68.         return "Invalid handle";
  69.     case AACENC_MEMORY_ERROR:
  70.         return "Memory allocation error";
  71.     case AACENC_UNSUPPORTED_PARAMETER:
  72.         return "Unsupported parameter";
  73.     case AACENC_INVALID_CONFIG:
  74.         return "Invalid config";
  75.     case AACENC_INIT_ERROR:
  76.         return "Initialization error";
  77.     case AACENC_INIT_AAC_ERROR:
  78.         return "AAC library initialization error";
  79.     case AACENC_INIT_SBR_ERROR:
  80.         return "SBR library initialization error";
  81.     case AACENC_INIT_TP_ERROR:
  82.         return "Transport library initialization error";
  83.     case AACENC_INIT_META_ERROR:
  84.         return "Metadata library initialization error";
  85.     case AACENC_ENCODE_ERROR:
  86.         return "Encoding error";
  87.     case AACENC_ENCODE_EOF:
  88.         return "End of file";
  89.     default:
  90.         return "Unknown error";
  91.     }
  92. }
  93.  
  94. static int aac_encode_close(AVCodecContext *avctx)
  95. {
  96.     AACContext *s = avctx->priv_data;
  97.  
  98.     if (s->handle)
  99.         aacEncClose(&s->handle);
  100.     av_freep(&avctx->extradata);
  101.     ff_af_queue_close(&s->afq);
  102.  
  103.     return 0;
  104. }
  105.  
  106. static av_cold int aac_encode_init(AVCodecContext *avctx)
  107. {
  108.     AACContext *s = avctx->priv_data;
  109.     int ret = AVERROR(EINVAL);
  110.     AACENC_InfoStruct info = { 0 };
  111.     CHANNEL_MODE mode;
  112.     AACENC_ERROR err;
  113.     int aot = FF_PROFILE_AAC_LOW + 1;
  114.     int sce = 0, cpe = 0;
  115.  
  116.     if ((err = aacEncOpen(&s->handle, 0, avctx->channels)) != AACENC_OK) {
  117.         av_log(avctx, AV_LOG_ERROR, "Unable to open the encoder: %s\n",
  118.                aac_get_error(err));
  119.         goto error;
  120.     }
  121.  
  122.     if (avctx->profile != FF_PROFILE_UNKNOWN)
  123.         aot = avctx->profile + 1;
  124.  
  125.     if ((err = aacEncoder_SetParam(s->handle, AACENC_AOT, aot)) != AACENC_OK) {
  126.         av_log(avctx, AV_LOG_ERROR, "Unable to set the AOT %d: %s\n",
  127.                aot, aac_get_error(err));
  128.         goto error;
  129.     }
  130.  
  131.     if (aot == FF_PROFILE_AAC_ELD + 1 && s->eld_sbr) {
  132.         if ((err = aacEncoder_SetParam(s->handle, AACENC_SBR_MODE,
  133.                                        1)) != AACENC_OK) {
  134.             av_log(avctx, AV_LOG_ERROR, "Unable to enable SBR for ELD: %s\n",
  135.                    aac_get_error(err));
  136.             goto error;
  137.         }
  138.     }
  139.  
  140.     if ((err = aacEncoder_SetParam(s->handle, AACENC_SAMPLERATE,
  141.                                    avctx->sample_rate)) != AACENC_OK) {
  142.         av_log(avctx, AV_LOG_ERROR, "Unable to set the sample rate %d: %s\n",
  143.                avctx->sample_rate, aac_get_error(err));
  144.         goto error;
  145.     }
  146.  
  147.     switch (avctx->channels) {
  148.     case 1: mode = MODE_1;       sce = 1; cpe = 0; break;
  149.     case 2: mode = MODE_2;       sce = 0; cpe = 1; break;
  150.     case 3: mode = MODE_1_2;     sce = 1; cpe = 1; break;
  151.     case 4: mode = MODE_1_2_1;   sce = 2; cpe = 1; break;
  152.     case 5: mode = MODE_1_2_2;   sce = 1; cpe = 2; break;
  153.     case 6: mode = MODE_1_2_2_1; sce = 2; cpe = 2; break;
  154.     default:
  155.         av_log(avctx, AV_LOG_ERROR,
  156.                "Unsupported number of channels %d\n", avctx->channels);
  157.         goto error;
  158.     }
  159.  
  160.     if ((err = aacEncoder_SetParam(s->handle, AACENC_CHANNELMODE,
  161.                                    mode)) != AACENC_OK) {
  162.         av_log(avctx, AV_LOG_ERROR,
  163.                "Unable to set channel mode %d: %s\n", mode, aac_get_error(err));
  164.         goto error;
  165.     }
  166.  
  167.     if ((err = aacEncoder_SetParam(s->handle, AACENC_CHANNELORDER,
  168.                                    1)) != AACENC_OK) {
  169.         av_log(avctx, AV_LOG_ERROR,
  170.                "Unable to set wav channel order %d: %s\n",
  171.                mode, aac_get_error(err));
  172.         goto error;
  173.     }
  174.  
  175.     if (avctx->flags & CODEC_FLAG_QSCALE || s->vbr) {
  176.         int mode = s->vbr ? s->vbr : avctx->global_quality;
  177.         if (mode <  1 || mode > 5) {
  178.             av_log(avctx, AV_LOG_WARNING,
  179.                    "VBR quality %d out of range, should be 1-5\n", mode);
  180.             mode = av_clip(mode, 1, 5);
  181.         }
  182.         av_log(avctx, AV_LOG_WARNING,
  183.                "Note, the VBR setting is unsupported and only works with "
  184.                "some parameter combinations\n");
  185.         if ((err = aacEncoder_SetParam(s->handle, AACENC_BITRATEMODE,
  186.                                        mode)) != AACENC_OK) {
  187.             av_log(avctx, AV_LOG_ERROR, "Unable to set the VBR bitrate mode %d: %s\n",
  188.                    mode, aac_get_error(err));
  189.             goto error;
  190.         }
  191.     } else {
  192.         if (avctx->bit_rate <= 0) {
  193.             if (avctx->profile == FF_PROFILE_AAC_HE_V2) {
  194.                 sce = 1;
  195.                 cpe = 0;
  196.             }
  197.             avctx->bit_rate = (96*sce + 128*cpe) * avctx->sample_rate / 44;
  198.             if (avctx->profile == FF_PROFILE_AAC_HE ||
  199.                 avctx->profile == FF_PROFILE_AAC_HE_V2 ||
  200.                 avctx->profile == FF_PROFILE_MPEG2_AAC_HE ||
  201.                 s->eld_sbr)
  202.                 avctx->bit_rate /= 2;
  203.         }
  204.         if ((err = aacEncoder_SetParam(s->handle, AACENC_BITRATE,
  205.                                        avctx->bit_rate)) != AACENC_OK) {
  206.             av_log(avctx, AV_LOG_ERROR, "Unable to set the bitrate %d: %s\n",
  207.                    avctx->bit_rate, aac_get_error(err));
  208.             goto error;
  209.         }
  210.     }
  211.  
  212.     /* Choose bitstream format - if global header is requested, use
  213.      * raw access units, otherwise use ADTS. */
  214.     if ((err = aacEncoder_SetParam(s->handle, AACENC_TRANSMUX,
  215.                                    avctx->flags & CODEC_FLAG_GLOBAL_HEADER ? 0 : s->latm ? 10 : 2)) != AACENC_OK) {
  216.         av_log(avctx, AV_LOG_ERROR, "Unable to set the transmux format: %s\n",
  217.                aac_get_error(err));
  218.         goto error;
  219.     }
  220.  
  221.     if (s->latm && s->header_period) {
  222.         if ((err = aacEncoder_SetParam(s->handle, AACENC_HEADER_PERIOD,
  223.                                        s->header_period)) != AACENC_OK) {
  224.              av_log(avctx, AV_LOG_ERROR, "Unable to set header period: %s\n",
  225.                     aac_get_error(err));
  226.              goto error;
  227.         }
  228.     }
  229.  
  230.     /* If no signaling mode is chosen, use explicit hierarchical signaling
  231.      * if using mp4 mode (raw access units, with global header) and
  232.      * implicit signaling if using ADTS. */
  233.     if (s->signaling < 0)
  234.         s->signaling = avctx->flags & CODEC_FLAG_GLOBAL_HEADER ? 2 : 0;
  235.  
  236.     if ((err = aacEncoder_SetParam(s->handle, AACENC_SIGNALING_MODE,
  237.                                    s->signaling)) != AACENC_OK) {
  238.         av_log(avctx, AV_LOG_ERROR, "Unable to set signaling mode %d: %s\n",
  239.                s->signaling, aac_get_error(err));
  240.         goto error;
  241.     }
  242.  
  243.     if ((err = aacEncoder_SetParam(s->handle, AACENC_AFTERBURNER,
  244.                                    s->afterburner)) != AACENC_OK) {
  245.         av_log(avctx, AV_LOG_ERROR, "Unable to set afterburner to %d: %s\n",
  246.                s->afterburner, aac_get_error(err));
  247.         goto error;
  248.     }
  249.  
  250.     if (avctx->cutoff > 0) {
  251.         if (avctx->cutoff < (avctx->sample_rate + 255) >> 8 || avctx->cutoff > 20000) {
  252.             av_log(avctx, AV_LOG_ERROR, "cutoff valid range is %d-20000\n",
  253.                    (avctx->sample_rate + 255) >> 8);
  254.             goto error;
  255.         }
  256.         if ((err = aacEncoder_SetParam(s->handle, AACENC_BANDWIDTH,
  257.                                        avctx->cutoff)) != AACENC_OK) {
  258.             av_log(avctx, AV_LOG_ERROR, "Unable to set the encoder bandwidth to %d: %s\n",
  259.                    avctx->cutoff, aac_get_error(err));
  260.             goto error;
  261.         }
  262.     }
  263.  
  264.     if ((err = aacEncEncode(s->handle, NULL, NULL, NULL, NULL)) != AACENC_OK) {
  265.         av_log(avctx, AV_LOG_ERROR, "Unable to initialize the encoder: %s\n",
  266.                aac_get_error(err));
  267.         return AVERROR(EINVAL);
  268.     }
  269.  
  270.     if ((err = aacEncInfo(s->handle, &info)) != AACENC_OK) {
  271.         av_log(avctx, AV_LOG_ERROR, "Unable to get encoder info: %s\n",
  272.                aac_get_error(err));
  273.         goto error;
  274.     }
  275.  
  276.     avctx->frame_size = info.frameLength;
  277.     avctx->delay      = info.encoderDelay;
  278.     ff_af_queue_init(avctx, &s->afq);
  279.  
  280.     if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
  281.         avctx->extradata_size = info.confSize;
  282.         avctx->extradata      = av_mallocz(avctx->extradata_size +
  283.                                            FF_INPUT_BUFFER_PADDING_SIZE);
  284.         if (!avctx->extradata) {
  285.             ret = AVERROR(ENOMEM);
  286.             goto error;
  287.         }
  288.  
  289.         memcpy(avctx->extradata, info.confBuf, info.confSize);
  290.     }
  291.     return 0;
  292. error:
  293.     aac_encode_close(avctx);
  294.     return ret;
  295. }
  296.  
  297. static int aac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
  298.                             const AVFrame *frame, int *got_packet_ptr)
  299. {
  300.     AACContext    *s        = avctx->priv_data;
  301.     AACENC_BufDesc in_buf   = { 0 }, out_buf = { 0 };
  302.     AACENC_InArgs  in_args  = { 0 };
  303.     AACENC_OutArgs out_args = { 0 };
  304.     int in_buffer_identifier = IN_AUDIO_DATA;
  305.     int in_buffer_size, in_buffer_element_size;
  306.     int out_buffer_identifier = OUT_BITSTREAM_DATA;
  307.     int out_buffer_size, out_buffer_element_size;
  308.     void *in_ptr, *out_ptr;
  309.     int ret;
  310.     AACENC_ERROR err;
  311.  
  312.     /* handle end-of-stream small frame and flushing */
  313.     if (!frame) {
  314.         in_args.numInSamples = -1;
  315.     } else {
  316.         in_ptr                   = frame->data[0];
  317.         in_buffer_size           = 2 * avctx->channels * frame->nb_samples;
  318.         in_buffer_element_size   = 2;
  319.  
  320.         in_args.numInSamples     = avctx->channels * frame->nb_samples;
  321.         in_buf.numBufs           = 1;
  322.         in_buf.bufs              = &in_ptr;
  323.         in_buf.bufferIdentifiers = &in_buffer_identifier;
  324.         in_buf.bufSizes          = &in_buffer_size;
  325.         in_buf.bufElSizes        = &in_buffer_element_size;
  326.  
  327.         /* add current frame to the queue */
  328.         if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
  329.             return ret;
  330.     }
  331.  
  332.     /* The maximum packet size is 6144 bits aka 768 bytes per channel. */
  333.     if ((ret = ff_alloc_packet2(avctx, avpkt, FFMAX(8192, 768 * avctx->channels))) < 0)
  334.         return ret;
  335.  
  336.     out_ptr                   = avpkt->data;
  337.     out_buffer_size           = avpkt->size;
  338.     out_buffer_element_size   = 1;
  339.     out_buf.numBufs           = 1;
  340.     out_buf.bufs              = &out_ptr;
  341.     out_buf.bufferIdentifiers = &out_buffer_identifier;
  342.     out_buf.bufSizes          = &out_buffer_size;
  343.     out_buf.bufElSizes        = &out_buffer_element_size;
  344.  
  345.     if ((err = aacEncEncode(s->handle, &in_buf, &out_buf, &in_args,
  346.                             &out_args)) != AACENC_OK) {
  347.         if (!frame && err == AACENC_ENCODE_EOF)
  348.             return 0;
  349.         av_log(avctx, AV_LOG_ERROR, "Unable to encode frame: %s\n",
  350.                aac_get_error(err));
  351.         return AVERROR(EINVAL);
  352.     }
  353.  
  354.     if (!out_args.numOutBytes)
  355.         return 0;
  356.  
  357.     /* Get the next frame pts & duration */
  358.     ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
  359.                        &avpkt->duration);
  360.  
  361.     avpkt->size     = out_args.numOutBytes;
  362.     *got_packet_ptr = 1;
  363.     return 0;
  364. }
  365.  
  366. static const AVProfile profiles[] = {
  367.     { FF_PROFILE_AAC_LOW,   "LC"       },
  368.     { FF_PROFILE_AAC_HE,    "HE-AAC"   },
  369.     { FF_PROFILE_AAC_HE_V2, "HE-AACv2" },
  370.     { FF_PROFILE_AAC_LD,    "LD"       },
  371.     { FF_PROFILE_AAC_ELD,   "ELD"      },
  372.     { FF_PROFILE_UNKNOWN },
  373. };
  374.  
  375. static const AVCodecDefault aac_encode_defaults[] = {
  376.     { "b", "0" },
  377.     { NULL }
  378. };
  379.  
  380. static const uint64_t aac_channel_layout[] = {
  381.     AV_CH_LAYOUT_MONO,
  382.     AV_CH_LAYOUT_STEREO,
  383.     AV_CH_LAYOUT_SURROUND,
  384.     AV_CH_LAYOUT_4POINT0,
  385.     AV_CH_LAYOUT_5POINT0_BACK,
  386.     AV_CH_LAYOUT_5POINT1_BACK,
  387.     0,
  388. };
  389.  
  390. static const int aac_sample_rates[] = {
  391.     96000, 88200, 64000, 48000, 44100, 32000,
  392.     24000, 22050, 16000, 12000, 11025, 8000, 0
  393. };
  394.  
  395. AVCodec ff_libfdk_aac_encoder = {
  396.     .name                  = "libfdk_aac",
  397.     .long_name             = NULL_IF_CONFIG_SMALL("Fraunhofer FDK AAC"),
  398.     .type                  = AVMEDIA_TYPE_AUDIO,
  399.     .id                    = AV_CODEC_ID_AAC,
  400.     .priv_data_size        = sizeof(AACContext),
  401.     .init                  = aac_encode_init,
  402.     .encode2               = aac_encode_frame,
  403.     .close                 = aac_encode_close,
  404.     .capabilities          = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY,
  405.     .sample_fmts           = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
  406.                                                             AV_SAMPLE_FMT_NONE },
  407.     .priv_class            = &aac_enc_class,
  408.     .defaults              = aac_encode_defaults,
  409.     .profiles              = profiles,
  410.     .supported_samplerates = aac_sample_rates,
  411.     .channel_layouts       = aac_channel_layout,
  412. };
  413.