Commit | Line | Data |
---|---|---|
2ba45a60 DM |
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 correspondance 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; | |
f6fa7814 | 96 | avctx->initial_padding = 80; |
2ba45a60 DM |
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) | |
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) | |
f6fa7814 | 132 | avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->initial_padding); |
2ba45a60 DM |
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 | }; |