/* * Interface to libfaac for aac encoding * Copyright (c) 2002 Gildas Bazin <gbazin@netcourrier.com> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * Interface to libfaac for aac encoding. */ #include <faac.h> #include "libavutil/channel_layout.h" #include "libavutil/common.h" #include "avcodec.h" #include "audio_frame_queue.h" #include "internal.h" /* libfaac has an encoder delay of 1024 samples */ #define FAAC_DELAY_SAMPLES 1024 typedef struct FaacAudioContext { faacEncHandle faac_handle; AudioFrameQueue afq; } FaacAudioContext; static av_cold int Faac_encode_close(AVCodecContext *avctx) { FaacAudioContext *s = avctx->priv_data; av_freep(&avctx->extradata); ff_af_queue_close(&s->afq); if (s->faac_handle) faacEncClose(s->faac_handle); return 0; } static const int channel_maps[][6] = { { 2, 0, 1 }, //< C L R { 2, 0, 1, 3 }, //< C L R Cs { 2, 0, 1, 3, 4 }, //< C L R Ls Rs { 2, 0, 1, 4, 5, 3 }, //< C L R Ls Rs LFE }; static av_cold int Faac_encode_init(AVCodecContext *avctx) { FaacAudioContext *s = avctx->priv_data; faacEncConfigurationPtr faac_cfg; unsigned long samples_input, max_bytes_output; int ret; /* number of channels */ if (avctx->channels < 1 || avctx->channels > 6) { av_log(avctx, AV_LOG_ERROR, "encoding %d channel(s) is not allowed\n", avctx->channels); ret = AVERROR(EINVAL); goto error; } s->faac_handle = faacEncOpen(avctx->sample_rate, avctx->channels, &samples_input, &max_bytes_output); if (!s->faac_handle) { av_log(avctx, AV_LOG_ERROR, "error in faacEncOpen()\n"); ret = AVERROR_UNKNOWN; goto error; } /* check faac version */ faac_cfg = faacEncGetCurrentConfiguration(s->faac_handle); if (faac_cfg->version != FAAC_CFG_VERSION) { av_log(avctx, AV_LOG_ERROR, "wrong libfaac version (compiled for: %d, using %d)\n", FAAC_CFG_VERSION, faac_cfg->version); ret = AVERROR(EINVAL); goto error; } /* put the options in the configuration struct */ switch(avctx->profile) { case FF_PROFILE_AAC_MAIN: faac_cfg->aacObjectType = MAIN; break; case FF_PROFILE_UNKNOWN: case FF_PROFILE_AAC_LOW: faac_cfg->aacObjectType = LOW; break; case FF_PROFILE_AAC_SSR: faac_cfg->aacObjectType = SSR; break; case FF_PROFILE_AAC_LTP: faac_cfg->aacObjectType = LTP; break; default: av_log(avctx, AV_LOG_ERROR, "invalid AAC profile\n"); ret = AVERROR(EINVAL); goto error; } faac_cfg->mpegVersion = MPEG4; faac_cfg->useTns = 0; faac_cfg->allowMidside = 1; faac_cfg->bitRate = avctx->bit_rate / avctx->channels; faac_cfg->bandWidth = avctx->cutoff; if(avctx->flags & CODEC_FLAG_QSCALE) { faac_cfg->bitRate = 0; faac_cfg->quantqual = avctx->global_quality / FF_QP2LAMBDA; } faac_cfg->outputFormat = 1; faac_cfg->inputFormat = FAAC_INPUT_16BIT; if (avctx->channels > 2) memcpy(faac_cfg->channel_map, channel_maps[avctx->channels-3], avctx->channels * sizeof(int)); avctx->frame_size = samples_input / avctx->channels; /* Set decoder specific info */ avctx->extradata_size = 0; if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) { unsigned char *buffer = NULL; unsigned long decoder_specific_info_size; if (!faacEncGetDecoderSpecificInfo(s->faac_handle, &buffer, &decoder_specific_info_size)) { avctx->extradata = av_malloc(decoder_specific_info_size + FF_INPUT_BUFFER_PADDING_SIZE); if (!avctx->extradata) { ret = AVERROR(ENOMEM); goto error; } avctx->extradata_size = decoder_specific_info_size; memcpy(avctx->extradata, buffer, avctx->extradata_size); faac_cfg->outputFormat = 0; } free(buffer); } if (!faacEncSetConfiguration(s->faac_handle, faac_cfg)) { int i; for (i = avctx->bit_rate/1000; i ; i--) { faac_cfg->bitRate = 1000*i / avctx->channels; if (faacEncSetConfiguration(s->faac_handle, faac_cfg)) break; } if (!i) { av_log(avctx, AV_LOG_ERROR, "libfaac doesn't support this output format!\n"); ret = AVERROR(EINVAL); goto error; } else { avctx->bit_rate = 1000*i; av_log(avctx, AV_LOG_WARNING, "libfaac doesn't support the specified bitrate, using %dkbit/s instead\n", i); } } avctx->delay = FAAC_DELAY_SAMPLES; ff_af_queue_init(avctx, &s->afq); return 0; error: Faac_encode_close(avctx); return ret; } static int Faac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr) { FaacAudioContext *s = avctx->priv_data; int bytes_written, ret; int num_samples = frame ? frame->nb_samples : 0; void *samples = frame ? frame->data[0] : NULL; if ((ret = ff_alloc_packet2(avctx, avpkt, (7 + 768) * avctx->channels)) < 0) return ret; bytes_written = faacEncEncode(s->faac_handle, samples, num_samples * avctx->channels, avpkt->data, avpkt->size); if (bytes_written < 0) { av_log(avctx, AV_LOG_ERROR, "faacEncEncode() error\n"); return bytes_written; } /* add current frame to the queue */ if (frame) { if ((ret = ff_af_queue_add(&s->afq, frame)) < 0) return ret; } if (!bytes_written) return 0; /* Get the next frame pts/duration */ ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts, &avpkt->duration); avpkt->size = bytes_written; *got_packet_ptr = 1; return 0; } static const AVProfile profiles[] = { { FF_PROFILE_AAC_MAIN, "Main" }, { FF_PROFILE_AAC_LOW, "LC" }, { FF_PROFILE_AAC_SSR, "SSR" }, { FF_PROFILE_AAC_LTP, "LTP" }, { FF_PROFILE_UNKNOWN }, }; static const uint64_t faac_channel_layouts[] = { AV_CH_LAYOUT_MONO, AV_CH_LAYOUT_STEREO, AV_CH_LAYOUT_SURROUND, AV_CH_LAYOUT_4POINT0, AV_CH_LAYOUT_5POINT0_BACK, AV_CH_LAYOUT_5POINT1_BACK, 0 }; AVCodec ff_libfaac_encoder = { .name = "libfaac", .long_name = NULL_IF_CONFIG_SMALL("libfaac AAC (Advanced Audio Coding)"), .type = AVMEDIA_TYPE_AUDIO, .id = AV_CODEC_ID_AAC, .priv_data_size = sizeof(FaacAudioContext), .init = Faac_encode_init, .encode2 = Faac_encode_frame, .close = Faac_encode_close, .capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY, .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE }, .profiles = NULL_IF_CONFIG_SMALL(profiles), .channel_layouts = faac_channel_layouts, };