yading@10: /*
yading@10:  * AAC encoder wrapper
yading@10:  * Copyright (c) 2012 Martin Storsjo
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include <fdk-aac/aacenc_lib.h>
yading@10: 
yading@10: #include "libavutil/channel_layout.h"
yading@10: #include "libavutil/common.h"
yading@10: #include "libavutil/opt.h"
yading@10: #include "avcodec.h"
yading@10: #include "audio_frame_queue.h"
yading@10: #include "internal.h"
yading@10: 
yading@10: typedef struct AACContext {
yading@10:     const AVClass *class;
yading@10:     HANDLE_AACENCODER handle;
yading@10:     int afterburner;
yading@10:     int eld_sbr;
yading@10:     int signaling;
yading@10:     int latm;
yading@10:     int header_period;
yading@10:     int vbr;
yading@10: 
yading@10:     AudioFrameQueue afq;
yading@10: } AACContext;
yading@10: 
yading@10: static const AVOption aac_enc_options[] = {
yading@10:     { "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 },
yading@10:     { "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 },
yading@10:     { "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" },
yading@10:     { "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" },
yading@10:     { "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" },
yading@10:     { "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" },
yading@10:     { "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" },
yading@10:     { "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 },
yading@10:     { "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 },
yading@10:     { "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 },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: static const AVClass aac_enc_class = {
yading@10:     "libfdk_aac", av_default_item_name, aac_enc_options, LIBAVUTIL_VERSION_INT
yading@10: };
yading@10: 
yading@10: static const char *aac_get_error(AACENC_ERROR err)
yading@10: {
yading@10:     switch (err) {
yading@10:     case AACENC_OK:
yading@10:         return "No error";
yading@10:     case AACENC_INVALID_HANDLE:
yading@10:         return "Invalid handle";
yading@10:     case AACENC_MEMORY_ERROR:
yading@10:         return "Memory allocation error";
yading@10:     case AACENC_UNSUPPORTED_PARAMETER:
yading@10:         return "Unsupported parameter";
yading@10:     case AACENC_INVALID_CONFIG:
yading@10:         return "Invalid config";
yading@10:     case AACENC_INIT_ERROR:
yading@10:         return "Initialization error";
yading@10:     case AACENC_INIT_AAC_ERROR:
yading@10:         return "AAC library initialization error";
yading@10:     case AACENC_INIT_SBR_ERROR:
yading@10:         return "SBR library initialization error";
yading@10:     case AACENC_INIT_TP_ERROR:
yading@10:         return "Transport library initialization error";
yading@10:     case AACENC_INIT_META_ERROR:
yading@10:         return "Metadata library initialization error";
yading@10:     case AACENC_ENCODE_ERROR:
yading@10:         return "Encoding error";
yading@10:     case AACENC_ENCODE_EOF:
yading@10:         return "End of file";
yading@10:     default:
yading@10:         return "Unknown error";
yading@10:     }
yading@10: }
yading@10: 
yading@10: static int aac_encode_close(AVCodecContext *avctx)
yading@10: {
yading@10:     AACContext *s = avctx->priv_data;
yading@10: 
yading@10:     if (s->handle)
yading@10:         aacEncClose(&s->handle);
yading@10:     av_freep(&avctx->extradata);
yading@10:     ff_af_queue_close(&s->afq);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold int aac_encode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     AACContext *s = avctx->priv_data;
yading@10:     int ret = AVERROR(EINVAL);
yading@10:     AACENC_InfoStruct info = { 0 };
yading@10:     CHANNEL_MODE mode;
yading@10:     AACENC_ERROR err;
yading@10:     int aot = FF_PROFILE_AAC_LOW + 1;
yading@10:     int sce = 0, cpe = 0;
yading@10: 
yading@10:     if ((err = aacEncOpen(&s->handle, 0, avctx->channels)) != AACENC_OK) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Unable to open the encoder: %s\n",
yading@10:                aac_get_error(err));
yading@10:         goto error;
yading@10:     }
yading@10: 
yading@10:     if (avctx->profile != FF_PROFILE_UNKNOWN)
yading@10:         aot = avctx->profile + 1;
yading@10: 
yading@10:     if ((err = aacEncoder_SetParam(s->handle, AACENC_AOT, aot)) != AACENC_OK) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Unable to set the AOT %d: %s\n",
yading@10:                aot, aac_get_error(err));
yading@10:         goto error;
yading@10:     }
yading@10: 
yading@10:     if (aot == FF_PROFILE_AAC_ELD + 1 && s->eld_sbr) {
yading@10:         if ((err = aacEncoder_SetParam(s->handle, AACENC_SBR_MODE,
yading@10:                                        1)) != AACENC_OK) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Unable to enable SBR for ELD: %s\n",
yading@10:                    aac_get_error(err));
yading@10:             goto error;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if ((err = aacEncoder_SetParam(s->handle, AACENC_SAMPLERATE,
yading@10:                                    avctx->sample_rate)) != AACENC_OK) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Unable to set the sample rate %d: %s\n",
yading@10:                avctx->sample_rate, aac_get_error(err));
yading@10:         goto error;
yading@10:     }
yading@10: 
yading@10:     switch (avctx->channels) {
yading@10:     case 1: mode = MODE_1;       sce = 1; cpe = 0; break;
yading@10:     case 2: mode = MODE_2;       sce = 0; cpe = 1; break;
yading@10:     case 3: mode = MODE_1_2;     sce = 1; cpe = 1; break;
yading@10:     case 4: mode = MODE_1_2_1;   sce = 2; cpe = 1; break;
yading@10:     case 5: mode = MODE_1_2_2;   sce = 1; cpe = 2; break;
yading@10:     case 6: mode = MODE_1_2_2_1; sce = 2; cpe = 2; break;
yading@10:     default:
yading@10:         av_log(avctx, AV_LOG_ERROR,
yading@10:                "Unsupported number of channels %d\n", avctx->channels);
yading@10:         goto error;
yading@10:     }
yading@10: 
yading@10:     if ((err = aacEncoder_SetParam(s->handle, AACENC_CHANNELMODE,
yading@10:                                    mode)) != AACENC_OK) {
yading@10:         av_log(avctx, AV_LOG_ERROR,
yading@10:                "Unable to set channel mode %d: %s\n", mode, aac_get_error(err));
yading@10:         goto error;
yading@10:     }
yading@10: 
yading@10:     if ((err = aacEncoder_SetParam(s->handle, AACENC_CHANNELORDER,
yading@10:                                    1)) != AACENC_OK) {
yading@10:         av_log(avctx, AV_LOG_ERROR,
yading@10:                "Unable to set wav channel order %d: %s\n",
yading@10:                mode, aac_get_error(err));
yading@10:         goto error;
yading@10:     }
yading@10: 
yading@10:     if (avctx->flags & CODEC_FLAG_QSCALE || s->vbr) {
yading@10:         int mode = s->vbr ? s->vbr : avctx->global_quality;
yading@10:         if (mode <  1 || mode > 5) {
yading@10:             av_log(avctx, AV_LOG_WARNING,
yading@10:                    "VBR quality %d out of range, should be 1-5\n", mode);
yading@10:             mode = av_clip(mode, 1, 5);
yading@10:         }
yading@10:         av_log(avctx, AV_LOG_WARNING,
yading@10:                "Note, the VBR setting is unsupported and only works with "
yading@10:                "some parameter combinations\n");
yading@10:         if ((err = aacEncoder_SetParam(s->handle, AACENC_BITRATEMODE,
yading@10:                                        mode)) != AACENC_OK) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Unable to set the VBR bitrate mode %d: %s\n",
yading@10:                    mode, aac_get_error(err));
yading@10:             goto error;
yading@10:         }
yading@10:     } else {
yading@10:         if (avctx->bit_rate <= 0) {
yading@10:             if (avctx->profile == FF_PROFILE_AAC_HE_V2) {
yading@10:                 sce = 1;
yading@10:                 cpe = 0;
yading@10:             }
yading@10:             avctx->bit_rate = (96*sce + 128*cpe) * avctx->sample_rate / 44;
yading@10:             if (avctx->profile == FF_PROFILE_AAC_HE ||
yading@10:                 avctx->profile == FF_PROFILE_AAC_HE_V2 ||
yading@10:                 s->eld_sbr)
yading@10:                 avctx->bit_rate /= 2;
yading@10:         }
yading@10:         if ((err = aacEncoder_SetParam(s->handle, AACENC_BITRATE,
yading@10:                                        avctx->bit_rate)) != AACENC_OK) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Unable to set the bitrate %d: %s\n",
yading@10:                    avctx->bit_rate, aac_get_error(err));
yading@10:             goto error;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     /* Choose bitstream format - if global header is requested, use
yading@10:      * raw access units, otherwise use ADTS. */
yading@10:     if ((err = aacEncoder_SetParam(s->handle, AACENC_TRANSMUX,
yading@10:                                    avctx->flags & CODEC_FLAG_GLOBAL_HEADER ? 0 : s->latm ? 10 : 2)) != AACENC_OK) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Unable to set the transmux format: %s\n",
yading@10:                aac_get_error(err));
yading@10:         goto error;
yading@10:     }
yading@10: 
yading@10:     if (s->latm && s->header_period) {
yading@10:         if ((err = aacEncoder_SetParam(s->handle, AACENC_HEADER_PERIOD,
yading@10:                                        s->header_period)) != AACENC_OK) {
yading@10:              av_log(avctx, AV_LOG_ERROR, "Unable to set header period: %s\n",
yading@10:                     aac_get_error(err));
yading@10:              goto error;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     /* If no signaling mode is chosen, use explicit hierarchical signaling
yading@10:      * if using mp4 mode (raw access units, with global header) and
yading@10:      * implicit signaling if using ADTS. */
yading@10:     if (s->signaling < 0)
yading@10:         s->signaling = avctx->flags & CODEC_FLAG_GLOBAL_HEADER ? 2 : 0;
yading@10: 
yading@10:     if ((err = aacEncoder_SetParam(s->handle, AACENC_SIGNALING_MODE,
yading@10:                                    s->signaling)) != AACENC_OK) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Unable to set signaling mode %d: %s\n",
yading@10:                s->signaling, aac_get_error(err));
yading@10:         goto error;
yading@10:     }
yading@10: 
yading@10:     if ((err = aacEncoder_SetParam(s->handle, AACENC_AFTERBURNER,
yading@10:                                    s->afterburner)) != AACENC_OK) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Unable to set afterburner to %d: %s\n",
yading@10:                s->afterburner, aac_get_error(err));
yading@10:         goto error;
yading@10:     }
yading@10: 
yading@10:     if (avctx->cutoff > 0) {
yading@10:         if (avctx->cutoff < (avctx->sample_rate + 255) >> 8 || avctx->cutoff > 20000) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "cutoff valid range is %d-20000\n",
yading@10:                    (avctx->sample_rate + 255) >> 8);
yading@10:             goto error;
yading@10:         }
yading@10:         if ((err = aacEncoder_SetParam(s->handle, AACENC_BANDWIDTH,
yading@10:                                        avctx->cutoff)) != AACENC_OK) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Unable to set the encoder bandwidth to %d: %s\n",
yading@10:                    avctx->cutoff, aac_get_error(err));
yading@10:             goto error;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if ((err = aacEncEncode(s->handle, NULL, NULL, NULL, NULL)) != AACENC_OK) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Unable to initialize the encoder: %s\n",
yading@10:                aac_get_error(err));
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     if ((err = aacEncInfo(s->handle, &info)) != AACENC_OK) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Unable to get encoder info: %s\n",
yading@10:                aac_get_error(err));
yading@10:         goto error;
yading@10:     }
yading@10: 
yading@10:     avctx->frame_size = info.frameLength;
yading@10:     avctx->delay      = info.encoderDelay;
yading@10:     ff_af_queue_init(avctx, &s->afq);
yading@10: 
yading@10:     if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
yading@10:         avctx->extradata_size = info.confSize;
yading@10:         avctx->extradata      = av_mallocz(avctx->extradata_size +
yading@10:                                            FF_INPUT_BUFFER_PADDING_SIZE);
yading@10:         if (!avctx->extradata) {
yading@10:             ret = AVERROR(ENOMEM);
yading@10:             goto error;
yading@10:         }
yading@10: 
yading@10:         memcpy(avctx->extradata, info.confBuf, info.confSize);
yading@10:     }
yading@10:     return 0;
yading@10: error:
yading@10:     aac_encode_close(avctx);
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: static int aac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
yading@10:                             const AVFrame *frame, int *got_packet_ptr)
yading@10: {
yading@10:     AACContext    *s        = avctx->priv_data;
yading@10:     AACENC_BufDesc in_buf   = { 0 }, out_buf = { 0 };
yading@10:     AACENC_InArgs  in_args  = { 0 };
yading@10:     AACENC_OutArgs out_args = { 0 };
yading@10:     int in_buffer_identifier = IN_AUDIO_DATA;
yading@10:     int in_buffer_size, in_buffer_element_size;
yading@10:     int out_buffer_identifier = OUT_BITSTREAM_DATA;
yading@10:     int out_buffer_size, out_buffer_element_size;
yading@10:     void *in_ptr, *out_ptr;
yading@10:     int ret;
yading@10:     AACENC_ERROR err;
yading@10: 
yading@10:     /* handle end-of-stream small frame and flushing */
yading@10:     if (!frame) {
yading@10:         in_args.numInSamples = -1;
yading@10:     } else {
yading@10:         in_ptr                   = frame->data[0];
yading@10:         in_buffer_size           = 2 * avctx->channels * frame->nb_samples;
yading@10:         in_buffer_element_size   = 2;
yading@10: 
yading@10:         in_args.numInSamples     = avctx->channels * frame->nb_samples;
yading@10:         in_buf.numBufs           = 1;
yading@10:         in_buf.bufs              = &in_ptr;
yading@10:         in_buf.bufferIdentifiers = &in_buffer_identifier;
yading@10:         in_buf.bufSizes          = &in_buffer_size;
yading@10:         in_buf.bufElSizes        = &in_buffer_element_size;
yading@10: 
yading@10:         /* add current frame to the queue */
yading@10:         if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
yading@10:             return ret;
yading@10:     }
yading@10: 
yading@10:     /* The maximum packet size is 6144 bits aka 768 bytes per channel. */
yading@10:     if ((ret = ff_alloc_packet2(avctx, avpkt, FFMAX(8192, 768 * avctx->channels))) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     out_ptr                   = avpkt->data;
yading@10:     out_buffer_size           = avpkt->size;
yading@10:     out_buffer_element_size   = 1;
yading@10:     out_buf.numBufs           = 1;
yading@10:     out_buf.bufs              = &out_ptr;
yading@10:     out_buf.bufferIdentifiers = &out_buffer_identifier;
yading@10:     out_buf.bufSizes          = &out_buffer_size;
yading@10:     out_buf.bufElSizes        = &out_buffer_element_size;
yading@10: 
yading@10:     if ((err = aacEncEncode(s->handle, &in_buf, &out_buf, &in_args,
yading@10:                             &out_args)) != AACENC_OK) {
yading@10:         if (!frame && err == AACENC_ENCODE_EOF)
yading@10:             return 0;
yading@10:         av_log(avctx, AV_LOG_ERROR, "Unable to encode frame: %s\n",
yading@10:                aac_get_error(err));
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     if (!out_args.numOutBytes)
yading@10:         return 0;
yading@10: 
yading@10:     /* Get the next frame pts & duration */
yading@10:     ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
yading@10:                        &avpkt->duration);
yading@10: 
yading@10:     avpkt->size     = out_args.numOutBytes;
yading@10:     *got_packet_ptr = 1;
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static const AVProfile profiles[] = {
yading@10:     { FF_PROFILE_AAC_LOW,   "LC"       },
yading@10:     { FF_PROFILE_AAC_HE,    "HE-AAC"   },
yading@10:     { FF_PROFILE_AAC_HE_V2, "HE-AACv2" },
yading@10:     { FF_PROFILE_AAC_LD,    "LD"       },
yading@10:     { FF_PROFILE_AAC_ELD,   "ELD"      },
yading@10:     { FF_PROFILE_UNKNOWN },
yading@10: };
yading@10: 
yading@10: static const AVCodecDefault aac_encode_defaults[] = {
yading@10:     { "b", "0" },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: static const uint64_t aac_channel_layout[] = {
yading@10:     AV_CH_LAYOUT_MONO,
yading@10:     AV_CH_LAYOUT_STEREO,
yading@10:     AV_CH_LAYOUT_SURROUND,
yading@10:     AV_CH_LAYOUT_4POINT0,
yading@10:     AV_CH_LAYOUT_5POINT0_BACK,
yading@10:     AV_CH_LAYOUT_5POINT1_BACK,
yading@10:     0,
yading@10: };
yading@10: 
yading@10: static const int aac_sample_rates[] = {
yading@10:     96000, 88200, 64000, 48000, 44100, 32000,
yading@10:     24000, 22050, 16000, 12000, 11025, 8000, 0
yading@10: };
yading@10: 
yading@10: AVCodec ff_libfdk_aac_encoder = {
yading@10:     .name                  = "libfdk_aac",
yading@10:     .type                  = AVMEDIA_TYPE_AUDIO,
yading@10:     .id                    = AV_CODEC_ID_AAC,
yading@10:     .priv_data_size        = sizeof(AACContext),
yading@10:     .init                  = aac_encode_init,
yading@10:     .encode2               = aac_encode_frame,
yading@10:     .close                 = aac_encode_close,
yading@10:     .capabilities          = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY,
yading@10:     .sample_fmts           = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
yading@10:                                                             AV_SAMPLE_FMT_NONE },
yading@10:     .long_name             = NULL_IF_CONFIG_SMALL("Fraunhofer FDK AAC"),
yading@10:     .priv_class            = &aac_enc_class,
yading@10:     .defaults              = aac_encode_defaults,
yading@10:     .profiles              = profiles,
yading@10:     .supported_samplerates = aac_sample_rates,
yading@10:     .channel_layouts       = aac_channel_layout,
yading@10: };