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ffmpeg / libavcodec / libvo-aacenc.c @ c41eb2ad

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/*
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 * AAC encoder wrapper
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 * Copyright (c) 2010 Martin Storsjo
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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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#include <vo-aacenc/voAAC.h>
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#include <vo-aacenc/cmnMemory.h>
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#include "avcodec.h"
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#include "mpeg4audio.h"
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typedef struct AACContext {
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    VO_AUDIO_CODECAPI codec_api;
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    VO_HANDLE handle;
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    VO_MEM_OPERATOR mem_operator;
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    VO_CODEC_INIT_USERDATA user_data;
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} AACContext;
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static av_cold int aac_encode_init(AVCodecContext *avctx)
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{
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    AACContext *s = avctx->priv_data;
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    AACENC_PARAM params = { 0 };
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    int index;
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    avctx->coded_frame = avcodec_alloc_frame();
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    avctx->frame_size = 1024;
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    voGetAACEncAPI(&s->codec_api);
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    s->mem_operator.Alloc = cmnMemAlloc;
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    s->mem_operator.Copy = cmnMemCopy;
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    s->mem_operator.Free = cmnMemFree;
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    s->mem_operator.Set = cmnMemSet;
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    s->mem_operator.Check = cmnMemCheck;
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    s->user_data.memflag = VO_IMF_USERMEMOPERATOR;
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    s->user_data.memData = &s->mem_operator;
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    s->codec_api.Init(&s->handle, VO_AUDIO_CodingAAC, &s->user_data);
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    params.sampleRate = avctx->sample_rate;
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    params.bitRate    = avctx->bit_rate;
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    params.nChannels  = avctx->channels;
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    params.adtsUsed   = !(avctx->flags & CODEC_FLAG_GLOBAL_HEADER);
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    if (s->codec_api.SetParam(s->handle, VO_PID_AAC_ENCPARAM, &params)
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        != VO_ERR_NONE) {
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        av_log(avctx, AV_LOG_ERROR, "Unable to set encoding parameters\n");
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        return AVERROR_UNKNOWN;
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    }
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    avctx->extradata_size = 2;
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    avctx->extradata      = av_mallocz(avctx->extradata_size +
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                                       FF_INPUT_BUFFER_PADDING_SIZE);
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    if (!avctx->extradata)
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        return AVERROR(ENOMEM);
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    for (index = 0; index < 16; index++)
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        if (avctx->sample_rate == ff_mpeg4audio_sample_rates[index])
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            break;
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    if (index == 16) {
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        av_log(avctx, AV_LOG_ERROR, "Unsupported sample rate %d\n",
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                                    avctx->sample_rate);
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        return AVERROR_NOTSUPP;
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    }
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    avctx->extradata[0] = 0x02 << 3 | index >> 1;
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    avctx->extradata[1] = (index & 0x01) << 7 | avctx->channels << 3;
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    return 0;
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}
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static int aac_encode_close(AVCodecContext *avctx)
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{
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    AACContext *s = avctx->priv_data;
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    s->codec_api.Uninit(s->handle);
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    av_freep(&avctx->coded_frame);
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    return 0;
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}
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static int aac_encode_frame(AVCodecContext *avctx,
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                            unsigned char *frame/*out*/,
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                            int buf_size, void *data/*in*/)
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{
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    AACContext *s = avctx->priv_data;
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    VO_CODECBUFFER input = { 0 }, output = { 0 };
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    VO_AUDIO_OUTPUTINFO output_info = { { 0 } };
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    input.Buffer = data;
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    input.Length = 2 * avctx->channels * avctx->frame_size;
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    output.Buffer = frame;
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    output.Length = buf_size;
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    s->codec_api.SetInputData(s->handle, &input);
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    if (s->codec_api.GetOutputData(s->handle, &output, &output_info)
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        != VO_ERR_NONE) {
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        av_log(avctx, AV_LOG_ERROR, "Unable to encode frame\n");
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        return AVERROR_UNKNOWN;
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    }
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    return output.Length;
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}
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AVCodec ff_libvo_aacenc_encoder = {
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    "libvo_aacenc",
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    CODEC_TYPE_AUDIO,
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    CODEC_ID_AAC,
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    sizeof(AACContext),
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    aac_encode_init,
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    aac_encode_frame,
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    aac_encode_close,
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    NULL,
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    .sample_fmts = (const enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
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    .long_name = NULL_IF_CONFIG_SMALL("libvo-aacenc AAC"),
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};