blob: 2a15650572d948de770bd42ec4111388aa59567e
1 | /* |
2 | * AMR Audio encoder stub |
3 | * Copyright (c) 2003 The FFmpeg project |
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 | #include <vo-amrwbenc/enc_if.h> |
23 | #include <stdio.h> |
24 | #include <stdlib.h> |
25 | |
26 | #include "libavutil/avstring.h" |
27 | #include "libavutil/internal.h" |
28 | #include "libavutil/mem.h" |
29 | #include "libavutil/opt.h" |
30 | #include "avcodec.h" |
31 | #include "internal.h" |
32 | |
33 | #define MAX_PACKET_SIZE (1 + (477 + 7) / 8) |
34 | |
35 | typedef struct AMRWBContext { |
36 | AVClass *av_class; |
37 | void *state; |
38 | int mode; |
39 | int last_bitrate; |
40 | int allow_dtx; |
41 | } AMRWBContext; |
42 | |
43 | static const AVOption options[] = { |
44 | { "dtx", "Allow DTX (generate comfort noise)", offsetof(AMRWBContext, allow_dtx), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM }, |
45 | { NULL } |
46 | }; |
47 | |
48 | static const AVClass amrwb_class = { |
49 | "libvo_amrwbenc", av_default_item_name, options, LIBAVUTIL_VERSION_INT |
50 | }; |
51 | |
52 | static int get_wb_bitrate_mode(int bitrate, void *log_ctx) |
53 | { |
54 | /* make the correspondence between bitrate and mode */ |
55 | static const int rates[] = { 6600, 8850, 12650, 14250, 15850, 18250, |
56 | 19850, 23050, 23850 }; |
57 | int i, best = -1, min_diff = 0; |
58 | char log_buf[200]; |
59 | |
60 | for (i = 0; i < 9; i++) { |
61 | if (rates[i] == bitrate) |
62 | return i; |
63 | if (best < 0 || abs(rates[i] - bitrate) < min_diff) { |
64 | best = i; |
65 | min_diff = abs(rates[i] - bitrate); |
66 | } |
67 | } |
68 | /* no bitrate matching exactly, log a warning */ |
69 | snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of "); |
70 | for (i = 0; i < 9; i++) |
71 | av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i] / 1000.f); |
72 | av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best] / 1000.f); |
73 | av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf); |
74 | |
75 | return best; |
76 | } |
77 | |
78 | static av_cold int amr_wb_encode_init(AVCodecContext *avctx) |
79 | { |
80 | AMRWBContext *s = avctx->priv_data; |
81 | |
82 | if (avctx->sample_rate != 16000 && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) { |
83 | av_log(avctx, AV_LOG_ERROR, "Only 16000Hz sample rate supported\n"); |
84 | return AVERROR(ENOSYS); |
85 | } |
86 | |
87 | if (avctx->channels != 1) { |
88 | av_log(avctx, AV_LOG_ERROR, "Only mono supported\n"); |
89 | return AVERROR(ENOSYS); |
90 | } |
91 | |
92 | s->mode = get_wb_bitrate_mode(avctx->bit_rate, avctx); |
93 | s->last_bitrate = avctx->bit_rate; |
94 | |
95 | avctx->frame_size = 320; |
96 | avctx->initial_padding = 80; |
97 | |
98 | s->state = E_IF_init(); |
99 | |
100 | return 0; |
101 | } |
102 | |
103 | static int amr_wb_encode_close(AVCodecContext *avctx) |
104 | { |
105 | AMRWBContext *s = avctx->priv_data; |
106 | |
107 | E_IF_exit(s->state); |
108 | return 0; |
109 | } |
110 | |
111 | static int amr_wb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, |
112 | const AVFrame *frame, int *got_packet_ptr) |
113 | { |
114 | AMRWBContext *s = avctx->priv_data; |
115 | const int16_t *samples = (const int16_t *)frame->data[0]; |
116 | int size, ret; |
117 | |
118 | if ((ret = ff_alloc_packet2(avctx, avpkt, MAX_PACKET_SIZE, 0)) < 0) |
119 | return ret; |
120 | |
121 | if (s->last_bitrate != avctx->bit_rate) { |
122 | s->mode = get_wb_bitrate_mode(avctx->bit_rate, avctx); |
123 | s->last_bitrate = avctx->bit_rate; |
124 | } |
125 | size = E_IF_encode(s->state, s->mode, samples, avpkt->data, s->allow_dtx); |
126 | if (size <= 0 || size > MAX_PACKET_SIZE) { |
127 | av_log(avctx, AV_LOG_ERROR, "Error encoding frame\n"); |
128 | return AVERROR(EINVAL); |
129 | } |
130 | |
131 | if (frame->pts != AV_NOPTS_VALUE) |
132 | avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->initial_padding); |
133 | |
134 | avpkt->size = size; |
135 | *got_packet_ptr = 1; |
136 | return 0; |
137 | } |
138 | |
139 | AVCodec ff_libvo_amrwbenc_encoder = { |
140 | .name = "libvo_amrwbenc", |
141 | .long_name = NULL_IF_CONFIG_SMALL("Android VisualOn AMR-WB " |
142 | "(Adaptive Multi-Rate Wide-Band)"), |
143 | .type = AVMEDIA_TYPE_AUDIO, |
144 | .id = AV_CODEC_ID_AMR_WB, |
145 | .priv_data_size = sizeof(AMRWBContext), |
146 | .init = amr_wb_encode_init, |
147 | .encode2 = amr_wb_encode_frame, |
148 | .close = amr_wb_encode_close, |
149 | .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16, |
150 | AV_SAMPLE_FMT_NONE }, |
151 | .priv_class = &amrwb_class, |
152 | }; |
153 |