2 * Copyright (C) 2008 David Conrad
4 * This file is part of Libav.
6 * Libav is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * Libav is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include <speex/speex.h>
23 #include <speex/speex_header.h>
24 #include <speex/speex_stereo.h>
25 #include <speex/speex_callbacks.h>
29 SpeexStereoState stereo;
36 static av_cold int libspeex_decode_init(AVCodecContext *avctx)
38 LibSpeexContext *s = avctx->priv_data;
39 const SpeexMode *mode;
41 // defaults in the case of a missing header
42 if (avctx->sample_rate <= 8000)
43 mode = &speex_nb_mode;
44 else if (avctx->sample_rate <= 16000)
45 mode = &speex_wb_mode;
47 mode = &speex_uwb_mode;
49 if (avctx->extradata_size >= 80)
50 s->header = speex_packet_to_header(avctx->extradata, avctx->extradata_size);
52 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
54 avctx->sample_rate = s->header->rate;
55 avctx->channels = s->header->nb_channels;
56 avctx->frame_size = s->frame_size = s->header->frame_size;
57 if (s->header->frames_per_packet)
58 avctx->frame_size *= s->header->frames_per_packet;
60 mode = speex_lib_get_mode(s->header->mode);
62 av_log(avctx, AV_LOG_ERROR, "Unknown Speex mode %d", s->header->mode);
66 av_log(avctx, AV_LOG_INFO, "Missing Speex header, assuming defaults.\n");
68 if (avctx->channels > 2) {
69 av_log(avctx, AV_LOG_ERROR, "Only stereo and mono are supported.\n");
73 speex_bits_init(&s->bits);
74 s->dec_state = speex_decoder_init(mode);
76 av_log(avctx, AV_LOG_ERROR, "Error initializing libspeex decoder.\n");
81 speex_decoder_ctl(s->dec_state, SPEEX_GET_FRAME_SIZE, &s->frame_size);
84 if (avctx->channels == 2) {
85 SpeexCallback callback;
86 callback.callback_id = SPEEX_INBAND_STEREO;
87 callback.func = speex_std_stereo_request_handler;
88 callback.data = &s->stereo;
89 s->stereo = (SpeexStereoState)SPEEX_STEREO_STATE_INIT;
90 speex_decoder_ctl(s->dec_state, SPEEX_SET_HANDLER, &callback);
95 static int libspeex_decode_frame(AVCodecContext *avctx,
96 void *data, int *data_size,
99 uint8_t *buf = avpkt->data;
100 int buf_size = avpkt->size;
101 LibSpeexContext *s = avctx->priv_data;
102 int16_t *output = data, *end;
105 num_samples = s->frame_size * avctx->channels;
106 end = output + *data_size / sizeof(*output);
108 speex_bits_read_from(&s->bits, buf, buf_size);
110 for (i = 0; speex_bits_remaining(&s->bits) && output + num_samples < end; i++) {
111 int ret = speex_decode_int(s->dec_state, &s->bits, output);
113 av_log(avctx, AV_LOG_ERROR, "Error decoding Speex frame.\n");
115 } else if (ret == -1)
119 if (avctx->channels == 2)
120 speex_decode_stereo_int(output, s->frame_size, &s->stereo);
122 output += num_samples;
125 avctx->frame_size = s->frame_size * i;
126 *data_size = avctx->channels * avctx->frame_size * sizeof(*output);
130 static av_cold int libspeex_decode_close(AVCodecContext *avctx)
132 LibSpeexContext *s = avctx->priv_data;
134 speex_header_free(s->header);
135 speex_bits_destroy(&s->bits);
136 speex_decoder_destroy(s->dec_state);
141 AVCodec ff_libspeex_decoder = {
143 .type = AVMEDIA_TYPE_AUDIO,
144 .id = CODEC_ID_SPEEX,
145 .priv_data_size = sizeof(LibSpeexContext),
146 .init = libspeex_decode_init,
147 .close = libspeex_decode_close,
148 .decode = libspeex_decode_frame,
149 .long_name = NULL_IF_CONFIG_SMALL("libspeex Speex"),