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1 | /* |
2 | * Copyright (c) 2002 Mark Hills <mark@pogo.org.uk> | |
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 <vorbis/vorbisenc.h> | |
22 | ||
23 | #include "avcodec.h" | |
24 | #include "bytestream.h" | |
25 | #include "internal.h" | |
26 | ||
27 | typedef struct OggVorbisDecContext { | |
28 | vorbis_info vi; /**< vorbis_info used during init */ | |
29 | vorbis_dsp_state vd; /**< DSP state used for analysis */ | |
30 | vorbis_block vb; /**< vorbis_block used for analysis */ | |
31 | vorbis_comment vc; /**< VorbisComment info */ | |
32 | ogg_packet op; /**< ogg packet */ | |
33 | } OggVorbisDecContext; | |
34 | ||
35 | static int oggvorbis_decode_init(AVCodecContext *avccontext) { | |
36 | OggVorbisDecContext *context = avccontext->priv_data ; | |
37 | uint8_t *p= avccontext->extradata; | |
38 | int i, hsizes[3]; | |
39 | unsigned char *headers[3], *extradata = avccontext->extradata; | |
40 | ||
41 | vorbis_info_init(&context->vi) ; | |
42 | vorbis_comment_init(&context->vc) ; | |
43 | ||
44 | if(! avccontext->extradata_size || ! p) { | |
45 | av_log(avccontext, AV_LOG_ERROR, "vorbis extradata absent\n"); | |
46 | return -1; | |
47 | } | |
48 | ||
49 | if(p[0] == 0 && p[1] == 30) { | |
50 | for(i = 0; i < 3; i++){ | |
51 | hsizes[i] = bytestream_get_be16((const uint8_t **)&p); | |
52 | headers[i] = p; | |
53 | p += hsizes[i]; | |
54 | } | |
55 | } else if(*p == 2) { | |
56 | unsigned int offset = 1; | |
57 | p++; | |
58 | for(i=0; i<2; i++) { | |
59 | hsizes[i] = 0; | |
60 | while((*p == 0xFF) && (offset < avccontext->extradata_size)) { | |
61 | hsizes[i] += 0xFF; | |
62 | offset++; | |
63 | p++; | |
64 | } | |
65 | if(offset >= avccontext->extradata_size - 1) { | |
66 | av_log(avccontext, AV_LOG_ERROR, | |
67 | "vorbis header sizes damaged\n"); | |
68 | return -1; | |
69 | } | |
70 | hsizes[i] += *p; | |
71 | offset++; | |
72 | p++; | |
73 | } | |
74 | hsizes[2] = avccontext->extradata_size - hsizes[0]-hsizes[1]-offset; | |
75 | #if 0 | |
76 | av_log(avccontext, AV_LOG_DEBUG, | |
77 | "vorbis header sizes: %d, %d, %d, / extradata_len is %d \n", | |
78 | hsizes[0], hsizes[1], hsizes[2], avccontext->extradata_size); | |
79 | #endif | |
80 | headers[0] = extradata + offset; | |
81 | headers[1] = extradata + offset + hsizes[0]; | |
82 | headers[2] = extradata + offset + hsizes[0] + hsizes[1]; | |
83 | } else { | |
84 | av_log(avccontext, AV_LOG_ERROR, | |
85 | "vorbis initial header len is wrong: %d\n", *p); | |
86 | return -1; | |
87 | } | |
88 | ||
89 | for(i=0; i<3; i++){ | |
90 | context->op.b_o_s= i==0; | |
91 | context->op.bytes = hsizes[i]; | |
92 | context->op.packet = headers[i]; | |
93 | if(vorbis_synthesis_headerin(&context->vi, &context->vc, &context->op)<0){ | |
94 | av_log(avccontext, AV_LOG_ERROR, "%d. vorbis header damaged\n", i+1); | |
95 | return -1; | |
96 | } | |
97 | } | |
98 | ||
99 | avccontext->channels = context->vi.channels; | |
100 | avccontext->sample_rate = context->vi.rate; | |
101 | avccontext->sample_fmt = AV_SAMPLE_FMT_S16; | |
102 | avccontext->time_base= (AVRational){1, avccontext->sample_rate}; | |
103 | ||
104 | vorbis_synthesis_init(&context->vd, &context->vi); | |
105 | vorbis_block_init(&context->vd, &context->vb); | |
106 | ||
107 | return 0 ; | |
108 | } | |
109 | ||
110 | ||
111 | static inline int conv(int samples, float **pcm, char *buf, int channels) { | |
112 | int i, j; | |
113 | ogg_int16_t *ptr, *data = (ogg_int16_t*)buf ; | |
114 | float *mono ; | |
115 | ||
116 | for(i = 0 ; i < channels ; i++){ | |
117 | ptr = &data[i]; | |
118 | mono = pcm[i] ; | |
119 | ||
120 | for(j = 0 ; j < samples ; j++) { | |
121 | *ptr = av_clip_int16(mono[j] * 32767.f); | |
122 | ptr += channels; | |
123 | } | |
124 | } | |
125 | ||
126 | return 0 ; | |
127 | } | |
128 | ||
129 | static int oggvorbis_decode_frame(AVCodecContext *avccontext, void *data, | |
130 | int *got_frame_ptr, AVPacket *avpkt) | |
131 | { | |
132 | OggVorbisDecContext *context = avccontext->priv_data ; | |
133 | AVFrame *frame = data; | |
134 | float **pcm ; | |
135 | ogg_packet *op= &context->op; | |
136 | int samples, total_samples, total_bytes; | |
137 | int ret; | |
138 | int16_t *output; | |
139 | ||
140 | if(!avpkt->size){ | |
141 | //FIXME flush | |
142 | return 0; | |
143 | } | |
144 | ||
145 | frame->nb_samples = 8192*4; | |
146 | if ((ret = ff_get_buffer(avccontext, frame, 0)) < 0) | |
147 | return ret; | |
148 | output = (int16_t *)frame->data[0]; | |
149 | ||
150 | ||
151 | op->packet = avpkt->data; | |
152 | op->bytes = avpkt->size; | |
153 | ||
154 | // av_log(avccontext, AV_LOG_DEBUG, "%d %d %d %"PRId64" %"PRId64" %d %d\n", op->bytes, op->b_o_s, op->e_o_s, op->granulepos, op->packetno, buf_size, context->vi.rate); | |
155 | ||
156 | /* for(i=0; i<op->bytes; i++) | |
157 | av_log(avccontext, AV_LOG_DEBUG, "%02X ", op->packet[i]); | |
158 | av_log(avccontext, AV_LOG_DEBUG, "\n");*/ | |
159 | ||
160 | if(vorbis_synthesis(&context->vb, op) == 0) | |
161 | vorbis_synthesis_blockin(&context->vd, &context->vb) ; | |
162 | ||
163 | total_samples = 0 ; | |
164 | total_bytes = 0 ; | |
165 | ||
166 | while((samples = vorbis_synthesis_pcmout(&context->vd, &pcm)) > 0) { | |
167 | conv(samples, pcm, (char*)output + total_bytes, context->vi.channels) ; | |
168 | total_bytes += samples * 2 * context->vi.channels ; | |
169 | total_samples += samples ; | |
170 | vorbis_synthesis_read(&context->vd, samples) ; | |
171 | } | |
172 | ||
173 | frame->nb_samples = total_samples; | |
174 | *got_frame_ptr = total_samples > 0; | |
175 | return avpkt->size; | |
176 | } | |
177 | ||
178 | ||
179 | static int oggvorbis_decode_close(AVCodecContext *avccontext) { | |
180 | OggVorbisDecContext *context = avccontext->priv_data ; | |
181 | ||
182 | vorbis_info_clear(&context->vi) ; | |
183 | vorbis_comment_clear(&context->vc) ; | |
184 | ||
185 | return 0 ; | |
186 | } | |
187 | ||
188 | ||
189 | AVCodec ff_libvorbis_decoder = { | |
190 | .name = "libvorbis", | |
191 | .long_name = NULL_IF_CONFIG_SMALL("libvorbis"), | |
192 | .type = AVMEDIA_TYPE_AUDIO, | |
193 | .id = AV_CODEC_ID_VORBIS, | |
194 | .priv_data_size = sizeof(OggVorbisDecContext), | |
195 | .init = oggvorbis_decode_init, | |
196 | .decode = oggvorbis_decode_frame, | |
197 | .close = oggvorbis_decode_close, | |
198 | .capabilities = CODEC_CAP_DELAY, | |
199 | }; |