2 * Copyright (C) 2008 David Conrad
4 * This file is part of FFmpeg.
6 * FFmpeg 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 * FFmpeg 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 FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #include <speex/speex.h>
22 #include <speex/speex_header.h>
23 #include <speex/speex_stereo.h>
24 #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);
63 return AVERROR_INVALIDDATA;
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");
70 return AVERROR(EINVAL);
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;
103 int out_size, ret, consumed = 0;
105 /* check output buffer size */
106 out_size = s->frame_size * avctx->channels *
107 av_get_bytes_per_sample(avctx->sample_fmt);
108 if (*data_size < out_size) {
109 av_log(avctx, AV_LOG_ERROR, "Output buffer is too small\n");
110 return AVERROR(EINVAL);
113 /* if there is not enough data left for the smallest possible frame,
114 reset the libspeex buffer using the current packet, otherwise ignore
115 the current packet and keep decoding frames from the libspeex buffer. */
116 if (speex_bits_remaining(&s->bits) < 43) {
117 /* check for flush packet */
118 if (!buf || !buf_size) {
123 speex_bits_read_from(&s->bits, buf, buf_size);
127 /* decode a single frame */
128 ret = speex_decode_int(s->dec_state, &s->bits, output);
130 av_log(avctx, AV_LOG_ERROR, "Error decoding Speex frame.\n");
131 return AVERROR_INVALIDDATA;
133 if (avctx->channels == 2)
134 speex_decode_stereo_int(output, s->frame_size, &s->stereo);
136 *data_size = out_size;
140 static av_cold int libspeex_decode_close(AVCodecContext *avctx)
142 LibSpeexContext *s = avctx->priv_data;
144 speex_header_free(s->header);
145 speex_bits_destroy(&s->bits);
146 speex_decoder_destroy(s->dec_state);
151 static av_cold void libspeex_decode_flush(AVCodecContext *avctx)
153 LibSpeexContext *s = avctx->priv_data;
154 speex_bits_reset(&s->bits);
157 AVCodec ff_libspeex_decoder = {
159 .type = AVMEDIA_TYPE_AUDIO,
160 .id = CODEC_ID_SPEEX,
161 .priv_data_size = sizeof(LibSpeexContext),
162 .init = libspeex_decode_init,
163 .close = libspeex_decode_close,
164 .decode = libspeex_decode_frame,
165 .flush = libspeex_decode_flush,
166 .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DELAY,
167 .long_name = NULL_IF_CONFIG_SMALL("libspeex Speex"),