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00001 /*
00002  * AAC encoder wrapper
00003  * Copyright (c) 2010 Martin Storsjo
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include <vo-aacenc/voAAC.h>
00023 #include <vo-aacenc/cmnMemory.h>
00024 
00025 #include "avcodec.h"
00026 #include "mpeg4audio.h"
00027 
00028 typedef struct AACContext {
00029 VO_AUDIO_CODECAPI codec_api;
00030 VO_HANDLE handle;
00031 VO_MEM_OPERATOR mem_operator;
00032 VO_CODEC_INIT_USERDATA user_data;
00033 } AACContext;
00034 
00035 static av_cold int aac_encode_init(AVCodecContext *avctx)
00036 {
00037 AACContext *s = avctx->priv_data;
00038 AACENC_PARAM params = { 0 };
00039 int index;
00040 
00041 avctx->coded_frame = avcodec_alloc_frame();
00042 avctx->frame_size = 1024;
00043 
00044 voGetAACEncAPI(&s->codec_api);
00045 
00046 s->mem_operator.Alloc = cmnMemAlloc;
00047 s->mem_operator.Copy = cmnMemCopy;
00048 s->mem_operator.Free = cmnMemFree;
00049 s->mem_operator.Set = cmnMemSet;
00050 s->mem_operator.Check = cmnMemCheck;
00051 s->user_data.memflag = VO_IMF_USERMEMOPERATOR;
00052 s->user_data.memData = &s->mem_operator;
00053 s->codec_api.Init(&s->handle, VO_AUDIO_CodingAAC, &s->user_data);
00054 
00055 params.sampleRate = avctx->sample_rate;
00056 params.bitRate = avctx->bit_rate;
00057 params.nChannels = avctx->channels;
00058 params.adtsUsed = !(avctx->flags & CODEC_FLAG_GLOBAL_HEADER);
00059 if (s->codec_api.SetParam(s->handle, VO_PID_AAC_ENCPARAM, &params)
00060 != VO_ERR_NONE) {
00061 av_log(avctx, AV_LOG_ERROR, "Unable to set encoding parameters\n");
00062 return AVERROR(EINVAL);
00063 }
00064 
00065 for (index = 0; index < 16; index++)
00066 if (avctx->sample_rate == avpriv_mpeg4audio_sample_rates[index])
00067 break;
00068 if (index == 16) {
00069 av_log(avctx, AV_LOG_ERROR, "Unsupported sample rate %d\n",
00070 avctx->sample_rate);
00071 return AVERROR(ENOSYS);
00072 }
00073 if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
00074 avctx->extradata_size = 2;
00075 avctx->extradata = av_mallocz(avctx->extradata_size +
00076 FF_INPUT_BUFFER_PADDING_SIZE);
00077 if (!avctx->extradata)
00078 return AVERROR(ENOMEM);
00079 
00080 avctx->extradata[0] = 0x02 << 3 | index >> 1;
00081 avctx->extradata[1] = (index & 0x01) << 7 | avctx->channels << 3;
00082 }
00083 return 0;
00084 }
00085 
00086 static int aac_encode_close(AVCodecContext *avctx)
00087 {
00088 AACContext *s = avctx->priv_data;
00089 
00090 s->codec_api.Uninit(s->handle);
00091 av_freep(&avctx->coded_frame);
00092 
00093 return 0;
00094 }
00095 
00096 static int aac_encode_frame(AVCodecContext *avctx,
00097 unsigned char *frame/*out*/,
00098 int buf_size, void *data /*in*/)
00099 {
00100 AACContext *s = avctx->priv_data;
00101 VO_CODECBUFFER input = { 0 }, output = { 0 };
00102 VO_AUDIO_OUTPUTINFO output_info = { { 0 } };
00103 
00104 input.Buffer = data;
00105 input.Length = 2 * avctx->channels * avctx->frame_size;
00106 output.Buffer = frame;
00107 output.Length = buf_size;
00108 
00109 s->codec_api.SetInputData(s->handle, &input);
00110 if (s->codec_api.GetOutputData(s->handle, &output, &output_info)
00111 != VO_ERR_NONE) {
00112 av_log(avctx, AV_LOG_ERROR, "Unable to encode frame\n");
00113 return AVERROR(EINVAL);
00114 }
00115 return output.Length;
00116 }
00117 
00118 AVCodec ff_libvo_aacenc_encoder = {
00119 .name = "libvo_aacenc",
00120 .type = AVMEDIA_TYPE_AUDIO,
00121 .id = CODEC_ID_AAC,
00122 .priv_data_size = sizeof(AACContext),
00123 .init = aac_encode_init,
00124 .encode = aac_encode_frame,
00125 .close = aac_encode_close,
00126 .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
00127 .long_name = NULL_IF_CONFIG_SMALL("Android VisualOn AAC"),
00128 };
00129