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>
30 SpeexStereoState stereo;
37 static av_cold int libspeex_decode_init(AVCodecContext *avctx)
39 LibSpeexContext *s = avctx->priv_data;
40 const SpeexMode *mode;
42 // defaults in the case of a missing header
43 if (avctx->sample_rate <= 8000)
44 mode = &speex_nb_mode;
45 else if (avctx->sample_rate <= 16000)
46 mode = &speex_wb_mode;
48 mode = &speex_uwb_mode;
50 if (avctx->extradata_size >= 80)
51 s->header = speex_packet_to_header(avctx->extradata, avctx->extradata_size);
53 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
55 avctx->sample_rate = s->header->rate;
56 avctx->channels = s->header->nb_channels;
57 s->frame_size = s->header->frame_size;
59 mode = speex_lib_get_mode(s->header->mode);
61 av_log(avctx, AV_LOG_ERROR, "Unknown Speex mode %d", s->header->mode);
62 return AVERROR_INVALIDDATA;
65 av_log(avctx, AV_LOG_INFO, "Missing Speex header, assuming defaults.\n");
67 if (avctx->channels > 2) {
68 av_log(avctx, AV_LOG_ERROR, "Only stereo and mono are supported.\n");
69 return AVERROR(EINVAL);
72 speex_bits_init(&s->bits);
73 s->dec_state = speex_decoder_init(mode);
75 av_log(avctx, AV_LOG_ERROR, "Error initializing libspeex decoder.\n");
80 speex_decoder_ctl(s->dec_state, SPEEX_GET_FRAME_SIZE, &s->frame_size);
83 if (avctx->channels == 2) {
84 SpeexCallback callback;
85 callback.callback_id = SPEEX_INBAND_STEREO;
86 callback.func = speex_std_stereo_request_handler;
87 callback.data = &s->stereo;
88 s->stereo = (SpeexStereoState)SPEEX_STEREO_STATE_INIT;
89 speex_decoder_ctl(s->dec_state, SPEEX_SET_HANDLER, &callback);
92 avcodec_get_frame_defaults(&s->frame);
93 avctx->coded_frame = &s->frame;
98 static int libspeex_decode_frame(AVCodecContext *avctx, void *data,
99 int *got_frame_ptr, AVPacket *avpkt)
101 uint8_t *buf = avpkt->data;
102 int buf_size = avpkt->size;
103 LibSpeexContext *s = avctx->priv_data;
105 int ret, consumed = 0;
107 /* get output buffer */
108 s->frame.nb_samples = s->frame_size;
109 if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
110 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
113 output = (int16_t *)s->frame.data[0];
115 /* if there is not enough data left for the smallest possible frame,
116 reset the libspeex buffer using the current packet, otherwise ignore
117 the current packet and keep decoding frames from the libspeex buffer. */
118 if (speex_bits_remaining(&s->bits) < 43) {
119 /* check for flush packet */
120 if (!buf || !buf_size) {
125 speex_bits_read_from(&s->bits, buf, buf_size);
129 /* decode a single frame */
130 ret = speex_decode_int(s->dec_state, &s->bits, output);
132 av_log(avctx, AV_LOG_ERROR, "Error decoding Speex frame.\n");
133 return AVERROR_INVALIDDATA;
135 if (avctx->channels == 2)
136 speex_decode_stereo_int(output, s->frame_size, &s->stereo);
139 *(AVFrame *)data = s->frame;
144 static av_cold int libspeex_decode_close(AVCodecContext *avctx)
146 LibSpeexContext *s = avctx->priv_data;
148 speex_header_free(s->header);
149 speex_bits_destroy(&s->bits);
150 speex_decoder_destroy(s->dec_state);
155 static av_cold void libspeex_decode_flush(AVCodecContext *avctx)
157 LibSpeexContext *s = avctx->priv_data;
158 speex_bits_reset(&s->bits);
161 AVCodec ff_libspeex_decoder = {
163 .type = AVMEDIA_TYPE_AUDIO,
164 .id = CODEC_ID_SPEEX,
165 .priv_data_size = sizeof(LibSpeexContext),
166 .init = libspeex_decode_init,
167 .close = libspeex_decode_close,
168 .decode = libspeex_decode_frame,
169 .flush = libspeex_decode_flush,
170 .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DELAY | CODEC_CAP_DR1,
171 .long_name = NULL_IF_CONFIG_SMALL("libspeex Speex"),