1/*
2 * Interface to libfaac for aac encoding
3 * Copyright (c) 2002 Gildas Bazin <gbazin@netcourrier.com>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22/**
23 * @file
24 * Interface to libfaac for aac encoding.
25 */
26
27#include "avcodec.h"
28#include <faac.h>
29
30typedef struct FaacAudioContext {
31    faacEncHandle faac_handle;
32} FaacAudioContext;
33
34static av_cold int Faac_encode_init(AVCodecContext *avctx)
35{
36    FaacAudioContext *s = avctx->priv_data;
37    faacEncConfigurationPtr faac_cfg;
38    unsigned long samples_input, max_bytes_output;
39
40    /* number of channels */
41    if (avctx->channels < 1 || avctx->channels > 6) {
42        av_log(avctx, AV_LOG_ERROR, "encoding %d channel(s) is not allowed\n", avctx->channels);
43        return -1;
44    }
45
46    s->faac_handle = faacEncOpen(avctx->sample_rate,
47                                 avctx->channels,
48                                 &samples_input, &max_bytes_output);
49
50    /* check faac version */
51    faac_cfg = faacEncGetCurrentConfiguration(s->faac_handle);
52    if (faac_cfg->version != FAAC_CFG_VERSION) {
53        av_log(avctx, AV_LOG_ERROR, "wrong libfaac version (compiled for: %d, using %d)\n", FAAC_CFG_VERSION, faac_cfg->version);
54        faacEncClose(s->faac_handle);
55        return -1;
56    }
57
58    /* put the options in the configuration struct */
59    switch(avctx->profile) {
60        case FF_PROFILE_AAC_MAIN:
61            faac_cfg->aacObjectType = MAIN;
62            break;
63        case FF_PROFILE_UNKNOWN:
64        case FF_PROFILE_AAC_LOW:
65            faac_cfg->aacObjectType = LOW;
66            break;
67        case FF_PROFILE_AAC_SSR:
68            faac_cfg->aacObjectType = SSR;
69            break;
70        case FF_PROFILE_AAC_LTP:
71            faac_cfg->aacObjectType = LTP;
72            break;
73        default:
74            av_log(avctx, AV_LOG_ERROR, "invalid AAC profile\n");
75            faacEncClose(s->faac_handle);
76            return -1;
77    }
78    faac_cfg->mpegVersion = MPEG4;
79    faac_cfg->useTns = 0;
80    faac_cfg->allowMidside = 1;
81    faac_cfg->bitRate = avctx->bit_rate / avctx->channels;
82    faac_cfg->bandWidth = avctx->cutoff;
83    if(avctx->flags & CODEC_FLAG_QSCALE) {
84        faac_cfg->bitRate = 0;
85        faac_cfg->quantqual = avctx->global_quality / FF_QP2LAMBDA;
86    }
87    faac_cfg->outputFormat = 1;
88    faac_cfg->inputFormat = FAAC_INPUT_16BIT;
89
90    avctx->frame_size = samples_input / avctx->channels;
91
92    avctx->coded_frame= avcodec_alloc_frame();
93    avctx->coded_frame->key_frame= 1;
94
95    /* Set decoder specific info */
96    avctx->extradata_size = 0;
97    if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
98
99        unsigned char *buffer = NULL;
100        unsigned long decoder_specific_info_size;
101
102        if (!faacEncGetDecoderSpecificInfo(s->faac_handle, &buffer,
103                                           &decoder_specific_info_size)) {
104            avctx->extradata = av_malloc(decoder_specific_info_size + FF_INPUT_BUFFER_PADDING_SIZE);
105            avctx->extradata_size = decoder_specific_info_size;
106            memcpy(avctx->extradata, buffer, avctx->extradata_size);
107            faac_cfg->outputFormat = 0;
108        }
109#undef free
110        free(buffer);
111#define free please_use_av_free
112    }
113
114    if (!faacEncSetConfiguration(s->faac_handle, faac_cfg)) {
115        av_log(avctx, AV_LOG_ERROR, "libfaac doesn't support this output format!\n");
116        return -1;
117    }
118
119    return 0;
120}
121
122static int Faac_encode_frame(AVCodecContext *avctx,
123                             unsigned char *frame, int buf_size, void *data)
124{
125    FaacAudioContext *s = avctx->priv_data;
126    int bytes_written;
127
128    bytes_written = faacEncEncode(s->faac_handle,
129                                  data,
130                                  avctx->frame_size * avctx->channels,
131                                  frame,
132                                  buf_size);
133
134    return bytes_written;
135}
136
137static av_cold int Faac_encode_close(AVCodecContext *avctx)
138{
139    FaacAudioContext *s = avctx->priv_data;
140
141    av_freep(&avctx->coded_frame);
142    av_freep(&avctx->extradata);
143
144    faacEncClose(s->faac_handle);
145    return 0;
146}
147
148AVCodec libfaac_encoder = {
149    "libfaac",
150    AVMEDIA_TYPE_AUDIO,
151    CODEC_ID_AAC,
152    sizeof(FaacAudioContext),
153    Faac_encode_init,
154    Faac_encode_frame,
155    Faac_encode_close,
156    .sample_fmts = (const enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
157    .long_name = NULL_IF_CONFIG_SMALL("libfaac AAC (Advanced Audio Codec)"),
158};
159