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https://git.videolan.org/git/ffmpeg.git
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2df0c32ea1
Currently, the amount of padding inserted at the beginning by some audio encoders, is exported through AVCodecContext.delay. However - the term 'delay' is heavily overloaded and can have multiple different meanings even in the case of audio encoding. - this field has entirely different meanings, depending on whether the codec context is used for encoding or decoding (and has yet another different meaning for video), preventing generic handling of the codec context. Therefore, add a new field -- AVCodecContext.initial_padding. It could conceivably be used for decoding as well at a later point.
241 lines
7.5 KiB
C
241 lines
7.5 KiB
C
/*
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* Interface to libfaac for aac encoding
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* Copyright (c) 2002 Gildas Bazin <gbazin@netcourrier.com>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Interface to libfaac for aac encoding.
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*/
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#include <faac.h>
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#include "libavutil/channel_layout.h"
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#include "libavutil/common.h"
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#include "avcodec.h"
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#include "audio_frame_queue.h"
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#include "internal.h"
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/* libfaac has an encoder delay of 1024 samples */
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#define FAAC_DELAY_SAMPLES 1024
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typedef struct FaacAudioContext {
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faacEncHandle faac_handle;
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AudioFrameQueue afq;
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} FaacAudioContext;
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static av_cold int Faac_encode_close(AVCodecContext *avctx)
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{
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FaacAudioContext *s = avctx->priv_data;
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av_freep(&avctx->extradata);
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ff_af_queue_close(&s->afq);
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if (s->faac_handle)
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faacEncClose(s->faac_handle);
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return 0;
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}
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static const int channel_maps[][6] = {
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{ 2, 0, 1 }, //< C L R
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{ 2, 0, 1, 3 }, //< C L R Cs
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{ 2, 0, 1, 3, 4 }, //< C L R Ls Rs
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{ 2, 0, 1, 4, 5, 3 }, //< C L R Ls Rs LFE
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};
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static av_cold int Faac_encode_init(AVCodecContext *avctx)
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{
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FaacAudioContext *s = avctx->priv_data;
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faacEncConfigurationPtr faac_cfg;
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unsigned long samples_input, max_bytes_output;
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int ret;
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/* number of channels */
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if (avctx->channels < 1 || avctx->channels > 6) {
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av_log(avctx, AV_LOG_ERROR, "encoding %d channel(s) is not allowed\n", avctx->channels);
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ret = AVERROR(EINVAL);
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goto error;
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}
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s->faac_handle = faacEncOpen(avctx->sample_rate,
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avctx->channels,
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&samples_input, &max_bytes_output);
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if (!s->faac_handle) {
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av_log(avctx, AV_LOG_ERROR, "error in faacEncOpen()\n");
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ret = AVERROR_UNKNOWN;
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goto error;
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}
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/* check faac version */
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faac_cfg = faacEncGetCurrentConfiguration(s->faac_handle);
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if (faac_cfg->version != FAAC_CFG_VERSION) {
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av_log(avctx, AV_LOG_ERROR, "wrong libfaac version (compiled for: %d, using %d)\n", FAAC_CFG_VERSION, faac_cfg->version);
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ret = AVERROR(EINVAL);
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goto error;
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}
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/* put the options in the configuration struct */
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switch(avctx->profile) {
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case FF_PROFILE_AAC_MAIN:
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faac_cfg->aacObjectType = MAIN;
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break;
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case FF_PROFILE_UNKNOWN:
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case FF_PROFILE_AAC_LOW:
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faac_cfg->aacObjectType = LOW;
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break;
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case FF_PROFILE_AAC_SSR:
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faac_cfg->aacObjectType = SSR;
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break;
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case FF_PROFILE_AAC_LTP:
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faac_cfg->aacObjectType = LTP;
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "invalid AAC profile\n");
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ret = AVERROR(EINVAL);
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goto error;
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}
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faac_cfg->mpegVersion = MPEG4;
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faac_cfg->useTns = 0;
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faac_cfg->allowMidside = 1;
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faac_cfg->bitRate = avctx->bit_rate / avctx->channels;
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faac_cfg->bandWidth = avctx->cutoff;
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if(avctx->flags & CODEC_FLAG_QSCALE) {
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faac_cfg->bitRate = 0;
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faac_cfg->quantqual = avctx->global_quality / FF_QP2LAMBDA;
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}
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faac_cfg->outputFormat = 1;
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faac_cfg->inputFormat = FAAC_INPUT_16BIT;
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if (avctx->channels > 2)
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memcpy(faac_cfg->channel_map, channel_maps[avctx->channels-3],
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avctx->channels * sizeof(int));
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avctx->frame_size = samples_input / avctx->channels;
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/* Set decoder specific info */
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avctx->extradata_size = 0;
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if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
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unsigned char *buffer = NULL;
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unsigned long decoder_specific_info_size;
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if (!faacEncGetDecoderSpecificInfo(s->faac_handle, &buffer,
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&decoder_specific_info_size)) {
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avctx->extradata = av_malloc(decoder_specific_info_size + FF_INPUT_BUFFER_PADDING_SIZE);
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if (!avctx->extradata) {
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ret = AVERROR(ENOMEM);
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goto error;
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}
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avctx->extradata_size = decoder_specific_info_size;
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memcpy(avctx->extradata, buffer, avctx->extradata_size);
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faac_cfg->outputFormat = 0;
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}
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free(buffer);
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}
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if (!faacEncSetConfiguration(s->faac_handle, faac_cfg)) {
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av_log(avctx, AV_LOG_ERROR, "libfaac doesn't support this output format!\n");
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ret = AVERROR(EINVAL);
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goto error;
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}
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avctx->initial_padding = FAAC_DELAY_SAMPLES;
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ff_af_queue_init(avctx, &s->afq);
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return 0;
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error:
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Faac_encode_close(avctx);
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return ret;
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}
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static int Faac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
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const AVFrame *frame, int *got_packet_ptr)
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{
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FaacAudioContext *s = avctx->priv_data;
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int bytes_written, ret;
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int num_samples = frame ? frame->nb_samples : 0;
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void *samples = frame ? frame->data[0] : NULL;
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if ((ret = ff_alloc_packet(avpkt, (7 + 768) * avctx->channels))) {
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av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
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return ret;
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}
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bytes_written = faacEncEncode(s->faac_handle, samples,
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num_samples * avctx->channels,
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avpkt->data, avpkt->size);
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if (bytes_written < 0) {
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av_log(avctx, AV_LOG_ERROR, "faacEncEncode() error\n");
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return bytes_written;
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}
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/* add current frame to the queue */
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if (frame) {
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if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
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return ret;
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}
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if (!bytes_written)
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return 0;
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/* Get the next frame pts/duration */
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ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
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&avpkt->duration);
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avpkt->size = bytes_written;
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*got_packet_ptr = 1;
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return 0;
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}
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static const AVProfile profiles[] = {
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{ FF_PROFILE_AAC_MAIN, "Main" },
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{ FF_PROFILE_AAC_LOW, "LC" },
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{ FF_PROFILE_AAC_SSR, "SSR" },
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{ FF_PROFILE_AAC_LTP, "LTP" },
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{ FF_PROFILE_UNKNOWN },
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};
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static const uint64_t faac_channel_layouts[] = {
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AV_CH_LAYOUT_MONO,
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AV_CH_LAYOUT_STEREO,
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AV_CH_LAYOUT_SURROUND,
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AV_CH_LAYOUT_4POINT0,
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AV_CH_LAYOUT_5POINT0_BACK,
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AV_CH_LAYOUT_5POINT1_BACK,
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0
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};
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AVCodec ff_libfaac_encoder = {
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.name = "libfaac",
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.long_name = NULL_IF_CONFIG_SMALL("libfaac AAC (Advanced Audio Coding)"),
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.type = AVMEDIA_TYPE_AUDIO,
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.id = AV_CODEC_ID_AAC,
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.priv_data_size = sizeof(FaacAudioContext),
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.init = Faac_encode_init,
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.encode2 = Faac_encode_frame,
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.close = Faac_encode_close,
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.capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY,
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.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
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AV_SAMPLE_FMT_NONE },
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.profiles = NULL_IF_CONFIG_SMALL(profiles),
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.channel_layouts = faac_channel_layouts,
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};
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