aboutsummaryrefslogtreecommitdiffstats
path: root/libavcodec/libfaac.c
blob: 4fa570e15567357748e0e1832dfce3a1d4b7260e (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
/*
 * Interface to libfaac for aac encoding
 * Copyright (c) 2002 Gildas Bazin <gbazin@netcourrier.com>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * Interface to libfaac for aac encoding.
 */

#include "avcodec.h"
#include <faac.h>

typedef struct FaacAudioContext {
    faacEncHandle faac_handle;
} FaacAudioContext;

static const int channel_maps[][6] = {
    { 2, 0, 1 },          //< C L R
    { 2, 0, 1, 3 },       //< C L R Cs
    { 2, 0, 1, 3, 4 },    //< C L R Ls Rs
    { 2, 0, 1, 4, 5, 3 }, //< C L R Ls Rs LFE
};

static av_cold int Faac_encode_close(AVCodecContext *avctx)
{
    FaacAudioContext *s = avctx->priv_data;

    av_freep(&avctx->coded_frame);
    av_freep(&avctx->extradata);

    if (s->faac_handle)
        faacEncClose(s->faac_handle);
    return 0;
}

static av_cold int Faac_encode_init(AVCodecContext *avctx)
{
    FaacAudioContext *s = avctx->priv_data;
    faacEncConfigurationPtr faac_cfg;
    unsigned long samples_input, max_bytes_output;
    int ret;

    /* number of channels */
    if (avctx->channels < 1 || avctx->channels > 6) {
        av_log(avctx, AV_LOG_ERROR, "encoding %d channel(s) is not allowed\n", avctx->channels);
        ret = AVERROR(EINVAL);
        goto error;
    }

    s->faac_handle = faacEncOpen(avctx->sample_rate,
                                 avctx->channels,
                                 &samples_input, &max_bytes_output);
    if (!s->faac_handle) {
        av_log(avctx, AV_LOG_ERROR, "error in faacEncOpen()\n");
        ret = AVERROR_UNKNOWN;
        goto error;
    }

    /* check faac version */
    faac_cfg = faacEncGetCurrentConfiguration(s->faac_handle);
    if (faac_cfg->version != FAAC_CFG_VERSION) {
        av_log(avctx, AV_LOG_ERROR, "wrong libfaac version (compiled for: %d, using %d)\n", FAAC_CFG_VERSION, faac_cfg->version);
        ret = AVERROR(EINVAL);
        goto error;
    }

    /* put the options in the configuration struct */
    switch(avctx->profile) {
        case FF_PROFILE_AAC_MAIN:
            faac_cfg->aacObjectType = MAIN;
            break;
        case FF_PROFILE_UNKNOWN:
        case FF_PROFILE_AAC_LOW:
            faac_cfg->aacObjectType = LOW;
            break;
        case FF_PROFILE_AAC_SSR:
            faac_cfg->aacObjectType = SSR;
            break;
        case FF_PROFILE_AAC_LTP:
            faac_cfg->aacObjectType = LTP;
            break;
        default:
            av_log(avctx, AV_LOG_ERROR, "invalid AAC profile\n");
            ret = AVERROR(EINVAL);
            goto error;
    }
    faac_cfg->mpegVersion = MPEG4;
    faac_cfg->useTns = 0;
    faac_cfg->allowMidside = 1;
    faac_cfg->bitRate = avctx->bit_rate / avctx->channels;
    faac_cfg->bandWidth = avctx->cutoff;
    if(avctx->flags & CODEC_FLAG_QSCALE) {
        faac_cfg->bitRate = 0;
        faac_cfg->quantqual = avctx->global_quality / FF_QP2LAMBDA;
    }
    faac_cfg->outputFormat = 1;
    faac_cfg->inputFormat = FAAC_INPUT_16BIT;
    if (avctx->channels > 2)
        memcpy(faac_cfg->channel_map, channel_maps[avctx->channels-3],
               avctx->channels * sizeof(int));

    avctx->frame_size = samples_input / avctx->channels;

    avctx->coded_frame= avcodec_alloc_frame();
    if (!avctx->coded_frame) {
        ret = AVERROR(ENOMEM);
        goto error;
    }

    /* Set decoder specific info */
    avctx->extradata_size = 0;
    if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {

        unsigned char *buffer = NULL;
        unsigned long decoder_specific_info_size;

        if (!faacEncGetDecoderSpecificInfo(s->faac_handle, &buffer,
                                           &decoder_specific_info_size)) {
            avctx->extradata = av_malloc(decoder_specific_info_size + FF_INPUT_BUFFER_PADDING_SIZE);
            if (!avctx->extradata) {
                ret = AVERROR(ENOMEM);
                goto error;
            }
            avctx->extradata_size = decoder_specific_info_size;
            memcpy(avctx->extradata, buffer, avctx->extradata_size);
            faac_cfg->outputFormat = 0;
        }
#undef free
        free(buffer);
#define free please_use_av_free
    }

    if (!faacEncSetConfiguration(s->faac_handle, faac_cfg)) {
        av_log(avctx, AV_LOG_ERROR, "libfaac doesn't support this output format!\n");
        ret = AVERROR(EINVAL);
        goto error;
    }

    return 0;
error:
    Faac_encode_close(avctx);
    return ret;
}

static int Faac_encode_frame(AVCodecContext *avctx,
                             unsigned char *frame, int buf_size, void *data)
{
    FaacAudioContext *s = avctx->priv_data;
    int bytes_written;
    int num_samples = data ? avctx->frame_size : 0;

    bytes_written = faacEncEncode(s->faac_handle,
                                  data,
                                  num_samples * avctx->channels,
                                  frame,
                                  buf_size);

    return bytes_written;
}

static const AVProfile profiles[] = {
    { FF_PROFILE_AAC_MAIN, "Main" },
    { FF_PROFILE_AAC_LOW,  "LC"   },
    { FF_PROFILE_AAC_SSR,  "SSR"  },
    { FF_PROFILE_AAC_LTP,  "LTP"  },
    { FF_PROFILE_UNKNOWN },
};

AVCodec ff_libfaac_encoder = {
    .name           = "libfaac",
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = CODEC_ID_AAC,
    .priv_data_size = sizeof(FaacAudioContext),
    .init           = Faac_encode_init,
    .encode         = Faac_encode_frame,
    .close          = Faac_encode_close,
    .capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY,
    .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
    .long_name = NULL_IF_CONFIG_SMALL("libfaac AAC (Advanced Audio Codec)"),
    .profiles = NULL_IF_CONFIG_SMALL(profiles),
};