2 * AMR Audio encoder stub
3 * Copyright (c) 2003 the ffmpeg project
5 * This file is part of Libav.
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.
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.
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
22 #include <vo-amrwbenc/enc_if.h>
24 #include "libavutil/avstring.h"
25 #include "libavutil/opt.h"
29 #define MAX_PACKET_SIZE (1 + (477 + 7) / 8)
31 typedef struct AMRWBContext {
39 static const AVOption options[] = {
40 { "dtx", "Allow DTX (generate comfort noise)", offsetof(AMRWBContext, allow_dtx), AV_OPT_TYPE_INT, { 0 }, 0, 1, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
44 static const AVClass class = {
45 "libvo_amrwbenc", av_default_item_name, options, LIBAVUTIL_VERSION_INT
48 static int get_wb_bitrate_mode(int bitrate, void *log_ctx)
50 /* make the correspondance between bitrate and mode */
51 static const int rates[] = { 6600, 8850, 12650, 14250, 15850, 18250,
52 19850, 23050, 23850 };
53 int i, best = -1, min_diff = 0;
56 for (i = 0; i < 9; i++) {
57 if (rates[i] == bitrate)
59 if (best < 0 || abs(rates[i] - bitrate) < min_diff) {
61 min_diff = abs(rates[i] - bitrate);
64 /* no bitrate matching exactly, log a warning */
65 snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of ");
66 for (i = 0; i < 9; i++)
67 av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i] / 1000.f);
68 av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best] / 1000.f);
69 av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf);
74 static av_cold int amr_wb_encode_init(AVCodecContext *avctx)
76 AMRWBContext *s = avctx->priv_data;
78 if (avctx->sample_rate != 16000) {
79 av_log(avctx, AV_LOG_ERROR, "Only 16000Hz sample rate supported\n");
80 return AVERROR(ENOSYS);
83 if (avctx->channels != 1) {
84 av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
85 return AVERROR(ENOSYS);
88 s->mode = get_wb_bitrate_mode(avctx->bit_rate, avctx);
89 s->last_bitrate = avctx->bit_rate;
91 avctx->frame_size = 320;
93 #if FF_API_OLD_ENCODE_AUDIO
94 avctx->coded_frame = avcodec_alloc_frame();
95 if (!avctx->coded_frame)
96 return AVERROR(ENOMEM);
99 s->state = E_IF_init();
104 static int amr_wb_encode_close(AVCodecContext *avctx)
106 AMRWBContext *s = avctx->priv_data;
109 av_freep(&avctx->coded_frame);
113 static int amr_wb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
114 const AVFrame *frame, int *got_packet_ptr)
116 AMRWBContext *s = avctx->priv_data;
117 const int16_t *samples = (const int16_t *)frame->data[0];
120 if ((ret = ff_alloc_packet(avpkt, MAX_PACKET_SIZE))) {
121 av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
125 if (s->last_bitrate != avctx->bit_rate) {
126 s->mode = get_wb_bitrate_mode(avctx->bit_rate, avctx);
127 s->last_bitrate = avctx->bit_rate;
129 size = E_IF_encode(s->state, s->mode, samples, avpkt->data, s->allow_dtx);
130 if (size <= 0 || size > MAX_PACKET_SIZE) {
131 av_log(avctx, AV_LOG_ERROR, "Error encoding frame\n");
132 return AVERROR(EINVAL);
135 if (frame->pts != AV_NOPTS_VALUE)
136 avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->delay);
143 AVCodec ff_libvo_amrwbenc_encoder = {
144 .name = "libvo_amrwbenc",
145 .type = AVMEDIA_TYPE_AUDIO,
146 .id = AV_CODEC_ID_AMR_WB,
147 .priv_data_size = sizeof(AMRWBContext),
148 .init = amr_wb_encode_init,
149 .encode2 = amr_wb_encode_frame,
150 .close = amr_wb_encode_close,
151 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
152 AV_SAMPLE_FMT_NONE },
153 .long_name = NULL_IF_CONFIG_SMALL("Android VisualOn AMR-WB "
154 "(Adaptive Multi-Rate Wide-Band)"),
155 .priv_class = &class,