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_close(AVCodecContext *avccontext);
36
oggvorbis_decode_init(AVCodecContext * avccontext)37 static int oggvorbis_decode_init(AVCodecContext *avccontext) {
38 OggVorbisDecContext *context = avccontext->priv_data ;
39 uint8_t *p= avccontext->extradata;
40 int i, hsizes[3], ret;
41 unsigned char *headers[3], *extradata = avccontext->extradata;
42
43 if(! avccontext->extradata_size || ! p) {
44 av_log(avccontext, AV_LOG_ERROR, "vorbis extradata absent\n");
45 return AVERROR(EINVAL);
46 }
47
48 vorbis_info_init(&context->vi) ;
49 vorbis_comment_init(&context->vc) ;
50
51 if(p[0] == 0 && p[1] == 30) {
52 int sizesum = 0;
53 for(i = 0; i < 3; i++){
54 hsizes[i] = bytestream_get_be16((const uint8_t **)&p);
55 sizesum += 2 + hsizes[i];
56 if (sizesum > avccontext->extradata_size) {
57 av_log(avccontext, AV_LOG_ERROR, "vorbis extradata too small\n");
58 ret = AVERROR_INVALIDDATA;
59 goto error;
60 }
61
62 headers[i] = p;
63 p += hsizes[i];
64 }
65 } else if(*p == 2) {
66 unsigned int offset = 1;
67 unsigned int sizesum = 1;
68 p++;
69 for(i=0; i<2; i++) {
70 hsizes[i] = 0;
71 while((*p == 0xFF) && (sizesum < avccontext->extradata_size)) {
72 hsizes[i] += 0xFF;
73 offset++;
74 sizesum += 1 + 0xFF;
75 p++;
76 }
77 hsizes[i] += *p;
78 offset++;
79 sizesum += 1 + *p;
80 if(sizesum > avccontext->extradata_size) {
81 av_log(avccontext, AV_LOG_ERROR,
82 "vorbis header sizes damaged\n");
83 ret = AVERROR_INVALIDDATA;
84 goto error;
85 }
86 p++;
87 }
88 hsizes[2] = avccontext->extradata_size - hsizes[0]-hsizes[1]-offset;
89 #if 0
90 av_log(avccontext, AV_LOG_DEBUG,
91 "vorbis header sizes: %d, %d, %d, / extradata_len is %d \n",
92 hsizes[0], hsizes[1], hsizes[2], avccontext->extradata_size);
93 #endif
94 headers[0] = extradata + offset;
95 headers[1] = extradata + offset + hsizes[0];
96 headers[2] = extradata + offset + hsizes[0] + hsizes[1];
97 } else {
98 av_log(avccontext, AV_LOG_ERROR,
99 "vorbis initial header len is wrong: %d\n", *p);
100 ret = AVERROR_INVALIDDATA;
101 goto error;
102 }
103
104 for(i=0; i<3; i++){
105 context->op.b_o_s= i==0;
106 context->op.bytes = hsizes[i];
107 context->op.packet = headers[i];
108 if(vorbis_synthesis_headerin(&context->vi, &context->vc, &context->op)<0){
109 av_log(avccontext, AV_LOG_ERROR, "%d. vorbis header damaged\n", i+1);
110 ret = AVERROR_INVALIDDATA;
111 goto error;
112 }
113 }
114
115 avccontext->channels = context->vi.channels;
116 avccontext->sample_rate = context->vi.rate;
117 avccontext->sample_fmt = AV_SAMPLE_FMT_S16;
118 avccontext->time_base= (AVRational){1, avccontext->sample_rate};
119
120 vorbis_synthesis_init(&context->vd, &context->vi);
121 vorbis_block_init(&context->vd, &context->vb);
122
123 return 0 ;
124
125 error:
126 oggvorbis_decode_close(avccontext);
127 return ret;
128 }
129
130
conv(int samples,float ** pcm,char * buf,int channels)131 static inline int conv(int samples, float **pcm, char *buf, int channels) {
132 int i, j;
133 ogg_int16_t *ptr, *data = (ogg_int16_t*)buf ;
134 float *mono ;
135
136 for(i = 0 ; i < channels ; i++){
137 ptr = &data[i];
138 mono = pcm[i] ;
139
140 for(j = 0 ; j < samples ; j++) {
141 *ptr = av_clip_int16(mono[j] * 32767.f);
142 ptr += channels;
143 }
144 }
145
146 return 0 ;
147 }
148
oggvorbis_decode_frame(AVCodecContext * avccontext,void * data,int * got_frame_ptr,AVPacket * avpkt)149 static int oggvorbis_decode_frame(AVCodecContext *avccontext, void *data,
150 int *got_frame_ptr, AVPacket *avpkt)
151 {
152 OggVorbisDecContext *context = avccontext->priv_data ;
153 AVFrame *frame = data;
154 float **pcm ;
155 ogg_packet *op= &context->op;
156 int samples, total_samples, total_bytes;
157 int ret;
158 int16_t *output;
159
160 if(!avpkt->size){
161 //FIXME flush
162 return 0;
163 }
164
165 frame->nb_samples = 8192*4;
166 if ((ret = ff_get_buffer(avccontext, frame, 0)) < 0)
167 return ret;
168 output = (int16_t *)frame->data[0];
169
170
171 op->packet = avpkt->data;
172 op->bytes = avpkt->size;
173
174 // 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);
175
176 /* for(i=0; i<op->bytes; i++)
177 av_log(avccontext, AV_LOG_DEBUG, "%02X ", op->packet[i]);
178 av_log(avccontext, AV_LOG_DEBUG, "\n");*/
179
180 if(vorbis_synthesis(&context->vb, op) == 0)
181 vorbis_synthesis_blockin(&context->vd, &context->vb) ;
182
183 total_samples = 0 ;
184 total_bytes = 0 ;
185
186 while((samples = vorbis_synthesis_pcmout(&context->vd, &pcm)) > 0) {
187 conv(samples, pcm, (char*)output + total_bytes, context->vi.channels) ;
188 total_bytes += samples * 2 * context->vi.channels ;
189 total_samples += samples ;
190 vorbis_synthesis_read(&context->vd, samples) ;
191 }
192
193 frame->nb_samples = total_samples;
194 *got_frame_ptr = total_samples > 0;
195 return avpkt->size;
196 }
197
198
oggvorbis_decode_close(AVCodecContext * avccontext)199 static int oggvorbis_decode_close(AVCodecContext *avccontext) {
200 OggVorbisDecContext *context = avccontext->priv_data ;
201
202 vorbis_block_clear(&context->vb);
203 vorbis_dsp_clear(&context->vd);
204 vorbis_info_clear(&context->vi) ;
205 vorbis_comment_clear(&context->vc) ;
206
207 return 0 ;
208 }
209
210
211 AVCodec ff_libvorbis_decoder = {
212 .name = "libvorbis",
213 .long_name = NULL_IF_CONFIG_SMALL("libvorbis"),
214 .type = AVMEDIA_TYPE_AUDIO,
215 .id = AV_CODEC_ID_VORBIS,
216 .priv_data_size = sizeof(OggVorbisDecContext),
217 .init = oggvorbis_decode_init,
218 .decode = oggvorbis_decode_frame,
219 .close = oggvorbis_decode_close,
220 .capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_CHANNEL_CONF,
221 };
222