1/*
2 * AAC encoder wrapper
3 * Copyright (c) 2010 Martin Storsjo
4 *
5 * This file is part of Libav.
6 *
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include <vo-aacenc/voAAC.h>
23#include <vo-aacenc/cmnMemory.h>
24
25#include "avcodec.h"
26#include "mpeg4audio.h"
27
28typedef struct AACContext {
29    VO_AUDIO_CODECAPI codec_api;
30    VO_HANDLE handle;
31    VO_MEM_OPERATOR mem_operator;
32    VO_CODEC_INIT_USERDATA user_data;
33} AACContext;
34
35static av_cold int aac_encode_init(AVCodecContext *avctx)
36{
37    AACContext *s = avctx->priv_data;
38    AACENC_PARAM params = { 0 };
39    int index;
40
41    avctx->coded_frame = avcodec_alloc_frame();
42    avctx->frame_size = 1024;
43
44    voGetAACEncAPI(&s->codec_api);
45
46    s->mem_operator.Alloc = cmnMemAlloc;
47    s->mem_operator.Copy = cmnMemCopy;
48    s->mem_operator.Free = cmnMemFree;
49    s->mem_operator.Set = cmnMemSet;
50    s->mem_operator.Check = cmnMemCheck;
51    s->user_data.memflag = VO_IMF_USERMEMOPERATOR;
52    s->user_data.memData = &s->mem_operator;
53    s->codec_api.Init(&s->handle, VO_AUDIO_CodingAAC, &s->user_data);
54
55    params.sampleRate = avctx->sample_rate;
56    params.bitRate    = avctx->bit_rate;
57    params.nChannels  = avctx->channels;
58    params.adtsUsed   = !(avctx->flags & CODEC_FLAG_GLOBAL_HEADER);
59    if (s->codec_api.SetParam(s->handle, VO_PID_AAC_ENCPARAM, &params)
60        != VO_ERR_NONE) {
61        av_log(avctx, AV_LOG_ERROR, "Unable to set encoding parameters\n");
62        return AVERROR(EINVAL);
63    }
64
65    for (index = 0; index < 16; index++)
66        if (avctx->sample_rate == avpriv_mpeg4audio_sample_rates[index])
67            break;
68    if (index == 16) {
69        av_log(avctx, AV_LOG_ERROR, "Unsupported sample rate %d\n",
70                                    avctx->sample_rate);
71        return AVERROR(ENOSYS);
72    }
73    if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
74        avctx->extradata_size = 2;
75        avctx->extradata      = av_mallocz(avctx->extradata_size +
76                                           FF_INPUT_BUFFER_PADDING_SIZE);
77        if (!avctx->extradata)
78            return AVERROR(ENOMEM);
79
80        avctx->extradata[0] = 0x02 << 3 | index >> 1;
81        avctx->extradata[1] = (index & 0x01) << 7 | avctx->channels << 3;
82    }
83    return 0;
84}
85
86static int aac_encode_close(AVCodecContext *avctx)
87{
88    AACContext *s = avctx->priv_data;
89
90    s->codec_api.Uninit(s->handle);
91    av_freep(&avctx->coded_frame);
92
93    return 0;
94}
95
96static int aac_encode_frame(AVCodecContext *avctx,
97                            unsigned char *frame/*out*/,
98                            int buf_size, void *data/*in*/)
99{
100    AACContext *s = avctx->priv_data;
101    VO_CODECBUFFER input = { 0 }, output = { 0 };
102    VO_AUDIO_OUTPUTINFO output_info = { { 0 } };
103
104    input.Buffer = data;
105    input.Length = 2 * avctx->channels * avctx->frame_size;
106    output.Buffer = frame;
107    output.Length = buf_size;
108
109    s->codec_api.SetInputData(s->handle, &input);
110    if (s->codec_api.GetOutputData(s->handle, &output, &output_info)
111        != VO_ERR_NONE) {
112        av_log(avctx, AV_LOG_ERROR, "Unable to encode frame\n");
113        return AVERROR(EINVAL);
114    }
115    return output.Length;
116}
117
118AVCodec ff_libvo_aacenc_encoder = {
119    .name           = "libvo_aacenc",
120    .type           = AVMEDIA_TYPE_AUDIO,
121    .id             = CODEC_ID_AAC,
122    .priv_data_size = sizeof(AACContext),
123    .init           = aac_encode_init,
124    .encode         = aac_encode_frame,
125    .close          = aac_encode_close,
126    .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
127    .long_name = NULL_IF_CONFIG_SMALL("Android VisualOn AAC"),
128};
129
130