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1 | /* |
2 | * Copyright (C) 2008 David Conrad | |
3 | * | |
4 | * This file is part of FFmpeg. | |
5 | * | |
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. | |
10 | * | |
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. | |
15 | * | |
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 | |
19 | */ | |
20 | ||
21 | #include <speex/speex.h> | |
22 | #include <speex/speex_header.h> | |
23 | #include <speex/speex_stereo.h> | |
24 | #include <speex/speex_callbacks.h> | |
25 | ||
26 | #include "libavutil/channel_layout.h" | |
27 | #include "libavutil/common.h" | |
28 | #include "avcodec.h" | |
29 | #include "internal.h" | |
30 | ||
31 | typedef struct { | |
32 | SpeexBits bits; | |
33 | SpeexStereoState stereo; | |
34 | void *dec_state; | |
35 | int frame_size; | |
f6fa7814 | 36 | int pktsize; |
2ba45a60 DM |
37 | } LibSpeexContext; |
38 | ||
39 | ||
40 | static av_cold int libspeex_decode_init(AVCodecContext *avctx) | |
41 | { | |
42 | LibSpeexContext *s = avctx->priv_data; | |
43 | const SpeexMode *mode; | |
44 | SpeexHeader *header = NULL; | |
45 | int spx_mode; | |
46 | ||
47 | if (avctx->extradata && avctx->extradata_size >= 80) { | |
48 | header = speex_packet_to_header(avctx->extradata, | |
49 | avctx->extradata_size); | |
50 | if (!header) | |
51 | av_log(avctx, AV_LOG_WARNING, "Invalid Speex header\n"); | |
52 | } | |
53 | if (avctx->codec_tag == MKTAG('S', 'P', 'X', 'N')) { | |
f6fa7814 | 54 | int quality; |
2ba45a60 DM |
55 | if (!avctx->extradata || avctx->extradata && avctx->extradata_size < 47) { |
56 | av_log(avctx, AV_LOG_ERROR, "Missing or invalid extradata.\n"); | |
57 | return AVERROR_INVALIDDATA; | |
58 | } | |
f6fa7814 DM |
59 | |
60 | quality = avctx->extradata[37]; | |
61 | if (quality > 10) { | |
62 | av_log(avctx, AV_LOG_ERROR, "Unsupported quality mode %d.\n", quality); | |
2ba45a60 DM |
63 | return AVERROR_PATCHWELCOME; |
64 | } | |
f6fa7814 DM |
65 | |
66 | s->pktsize = ((const int[]){5,10,15,20,20,28,28,38,38,46,62})[quality]; | |
67 | ||
2ba45a60 DM |
68 | spx_mode = 0; |
69 | } else if (header) { | |
70 | avctx->sample_rate = header->rate; | |
71 | avctx->channels = header->nb_channels; | |
72 | spx_mode = header->mode; | |
73 | speex_header_free(header); | |
74 | } else { | |
75 | switch (avctx->sample_rate) { | |
76 | case 8000: spx_mode = 0; break; | |
77 | case 16000: spx_mode = 1; break; | |
78 | case 32000: spx_mode = 2; break; | |
79 | default: | |
80 | /* libspeex can handle any mode if initialized as ultra-wideband */ | |
81 | av_log(avctx, AV_LOG_WARNING, "Invalid sample rate: %d\n" | |
82 | "Decoding as 32kHz ultra-wideband\n", | |
83 | avctx->sample_rate); | |
84 | spx_mode = 2; | |
85 | } | |
86 | } | |
87 | ||
88 | mode = speex_lib_get_mode(spx_mode); | |
89 | if (!mode) { | |
90 | av_log(avctx, AV_LOG_ERROR, "Unknown Speex mode %d", spx_mode); | |
91 | return AVERROR_INVALIDDATA; | |
92 | } | |
93 | s->frame_size = 160 << spx_mode; | |
94 | if (!avctx->sample_rate) | |
95 | avctx->sample_rate = 8000 << spx_mode; | |
96 | ||
97 | if (avctx->channels < 1 || avctx->channels > 2) { | |
98 | /* libspeex can handle mono or stereo if initialized as stereo */ | |
99 | av_log(avctx, AV_LOG_ERROR, "Invalid channel count: %d.\n" | |
100 | "Decoding as stereo.\n", avctx->channels); | |
101 | avctx->channels = 2; | |
102 | } | |
103 | avctx->channel_layout = avctx->channels == 2 ? AV_CH_LAYOUT_STEREO : | |
104 | AV_CH_LAYOUT_MONO; | |
105 | ||
106 | speex_bits_init(&s->bits); | |
107 | s->dec_state = speex_decoder_init(mode); | |
108 | if (!s->dec_state) { | |
109 | av_log(avctx, AV_LOG_ERROR, "Error initializing libspeex decoder.\n"); | |
110 | return -1; | |
111 | } | |
112 | ||
113 | if (avctx->channels == 2) { | |
114 | SpeexCallback callback; | |
115 | callback.callback_id = SPEEX_INBAND_STEREO; | |
116 | callback.func = speex_std_stereo_request_handler; | |
117 | callback.data = &s->stereo; | |
118 | s->stereo = (SpeexStereoState)SPEEX_STEREO_STATE_INIT; | |
119 | speex_decoder_ctl(s->dec_state, SPEEX_SET_HANDLER, &callback); | |
120 | } | |
121 | ||
122 | return 0; | |
123 | } | |
124 | ||
125 | static int libspeex_decode_frame(AVCodecContext *avctx, void *data, | |
126 | int *got_frame_ptr, AVPacket *avpkt) | |
127 | { | |
128 | uint8_t *buf = avpkt->data; | |
129 | int buf_size = avpkt->size; | |
130 | LibSpeexContext *s = avctx->priv_data; | |
131 | AVFrame *frame = data; | |
132 | int16_t *output; | |
133 | int ret, consumed = 0; | |
134 | avctx->sample_fmt = AV_SAMPLE_FMT_S16; | |
135 | ||
136 | /* get output buffer */ | |
137 | frame->nb_samples = s->frame_size; | |
138 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) | |
139 | return ret; | |
140 | output = (int16_t *)frame->data[0]; | |
141 | ||
142 | /* if there is not enough data left for the smallest possible frame or the | |
143 | next 5 bits are a terminator code, reset the libspeex buffer using the | |
144 | current packet, otherwise ignore the current packet and keep decoding | |
145 | frames from the libspeex buffer. */ | |
146 | if (speex_bits_remaining(&s->bits) < 5 || | |
147 | speex_bits_peek_unsigned(&s->bits, 5) == 0xF) { | |
148 | /* check for flush packet */ | |
149 | if (!buf || !buf_size) { | |
150 | *got_frame_ptr = 0; | |
151 | return buf_size; | |
152 | } | |
f6fa7814 DM |
153 | if (s->pktsize && buf_size == 62) |
154 | buf_size = s->pktsize; | |
2ba45a60 DM |
155 | /* set new buffer */ |
156 | speex_bits_read_from(&s->bits, buf, buf_size); | |
f6fa7814 | 157 | consumed = avpkt->size; |
2ba45a60 DM |
158 | } |
159 | ||
160 | /* decode a single frame */ | |
161 | ret = speex_decode_int(s->dec_state, &s->bits, output); | |
162 | if (ret <= -2) { | |
163 | av_log(avctx, AV_LOG_ERROR, "Error decoding Speex frame.\n"); | |
164 | return AVERROR_INVALIDDATA; | |
165 | } | |
166 | if (avctx->channels == 2) | |
167 | speex_decode_stereo_int(output, s->frame_size, &s->stereo); | |
168 | ||
169 | *got_frame_ptr = 1; | |
170 | ||
171 | if (!avctx->bit_rate) | |
172 | speex_decoder_ctl(s->dec_state, SPEEX_GET_BITRATE, &avctx->bit_rate); | |
173 | return consumed; | |
174 | } | |
175 | ||
176 | static av_cold int libspeex_decode_close(AVCodecContext *avctx) | |
177 | { | |
178 | LibSpeexContext *s = avctx->priv_data; | |
179 | ||
180 | speex_bits_destroy(&s->bits); | |
181 | speex_decoder_destroy(s->dec_state); | |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
186 | static av_cold void libspeex_decode_flush(AVCodecContext *avctx) | |
187 | { | |
188 | LibSpeexContext *s = avctx->priv_data; | |
189 | speex_bits_reset(&s->bits); | |
190 | } | |
191 | ||
192 | AVCodec ff_libspeex_decoder = { | |
193 | .name = "libspeex", | |
194 | .long_name = NULL_IF_CONFIG_SMALL("libspeex Speex"), | |
195 | .type = AVMEDIA_TYPE_AUDIO, | |
196 | .id = AV_CODEC_ID_SPEEX, | |
197 | .priv_data_size = sizeof(LibSpeexContext), | |
198 | .init = libspeex_decode_init, | |
199 | .close = libspeex_decode_close, | |
200 | .decode = libspeex_decode_frame, | |
201 | .flush = libspeex_decode_flush, | |
202 | .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DELAY | CODEC_CAP_DR1, | |
203 | }; |