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>
26 #include "libavutil/channel_layout.h"
27 #include "libavutil/common.h"
33 SpeexStereoState stereo;
39 static av_cold int libspeex_decode_init(AVCodecContext *avctx)
41 LibSpeexContext *s = avctx->priv_data;
42 const SpeexMode *mode;
43 SpeexHeader *header = NULL;
46 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
47 if (avctx->extradata && avctx->extradata_size >= 80) {
48 header = speex_packet_to_header(avctx->extradata,
49 avctx->extradata_size);
51 av_log(avctx, AV_LOG_WARNING, "Invalid Speex header\n");
54 avctx->sample_rate = header->rate;
55 avctx->channels = header->nb_channels;
56 spx_mode = header->mode;
57 speex_header_free(header);
59 switch (avctx->sample_rate) {
60 case 8000: spx_mode = 0; break;
61 case 16000: spx_mode = 1; break;
62 case 32000: spx_mode = 2; break;
64 /* libspeex can handle any mode if initialized as ultra-wideband */
65 av_log(avctx, AV_LOG_WARNING, "Invalid sample rate: %d\n"
66 "Decoding as 32kHz ultra-wideband\n",
72 mode = speex_lib_get_mode(spx_mode);
74 av_log(avctx, AV_LOG_ERROR, "Unknown Speex mode %d", spx_mode);
75 return AVERROR_INVALIDDATA;
77 s->frame_size = 160 << spx_mode;
78 if (!avctx->sample_rate)
79 avctx->sample_rate = 8000 << spx_mode;
81 if (avctx->channels < 1 || avctx->channels > 2) {
82 /* libspeex can handle mono or stereo if initialized as stereo */
83 av_log(avctx, AV_LOG_ERROR, "Invalid channel count: %d.\n"
84 "Decoding as stereo.\n", avctx->channels);
87 avctx->channel_layout = avctx->channels == 2 ? AV_CH_LAYOUT_STEREO :
90 speex_bits_init(&s->bits);
91 s->dec_state = speex_decoder_init(mode);
93 av_log(avctx, AV_LOG_ERROR, "Error initializing libspeex decoder.\n");
97 if (avctx->channels == 2) {
98 SpeexCallback callback;
99 callback.callback_id = SPEEX_INBAND_STEREO;
100 callback.func = speex_std_stereo_request_handler;
101 callback.data = &s->stereo;
102 s->stereo = (SpeexStereoState)SPEEX_STEREO_STATE_INIT;
103 speex_decoder_ctl(s->dec_state, SPEEX_SET_HANDLER, &callback);
106 avcodec_get_frame_defaults(&s->frame);
107 avctx->coded_frame = &s->frame;
112 static int libspeex_decode_frame(AVCodecContext *avctx, void *data,
113 int *got_frame_ptr, AVPacket *avpkt)
115 uint8_t *buf = avpkt->data;
116 int buf_size = avpkt->size;
117 LibSpeexContext *s = avctx->priv_data;
119 int ret, consumed = 0;
121 /* get output buffer */
122 s->frame.nb_samples = s->frame_size;
123 if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
124 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
127 output = (int16_t *)s->frame.data[0];
129 /* if there is not enough data left for the smallest possible frame or the
130 next 5 bits are a terminator code, reset the libspeex buffer using the
131 current packet, otherwise ignore the current packet and keep decoding
132 frames from the libspeex buffer. */
133 if (speex_bits_remaining(&s->bits) < 5 ||
134 speex_bits_peek_unsigned(&s->bits, 5) == 0x1F) {
135 /* check for flush packet */
136 if (!buf || !buf_size) {
141 speex_bits_read_from(&s->bits, buf, buf_size);
145 /* decode a single frame */
146 ret = speex_decode_int(s->dec_state, &s->bits, output);
148 av_log(avctx, AV_LOG_ERROR, "Error decoding Speex frame.\n");
149 return AVERROR_INVALIDDATA;
151 if (avctx->channels == 2)
152 speex_decode_stereo_int(output, s->frame_size, &s->stereo);
155 *(AVFrame *)data = s->frame;
160 static av_cold int libspeex_decode_close(AVCodecContext *avctx)
162 LibSpeexContext *s = avctx->priv_data;
164 speex_bits_destroy(&s->bits);
165 speex_decoder_destroy(s->dec_state);
170 static av_cold void libspeex_decode_flush(AVCodecContext *avctx)
172 LibSpeexContext *s = avctx->priv_data;
173 speex_bits_reset(&s->bits);
176 AVCodec ff_libspeex_decoder = {
178 .type = AVMEDIA_TYPE_AUDIO,
179 .id = AV_CODEC_ID_SPEEX,
180 .priv_data_size = sizeof(LibSpeexContext),
181 .init = libspeex_decode_init,
182 .close = libspeex_decode_close,
183 .decode = libspeex_decode_frame,
184 .flush = libspeex_decode_flush,
185 .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DELAY | CODEC_CAP_DR1,
186 .long_name = NULL_IF_CONFIG_SMALL("libspeex Speex"),