fixes crash patch by (Mark Hills <mark at pogo dot org dot uk>)
[libav.git] / libavcodec / oggvorbis.c
1 /*
2 * Ogg Vorbis codec support via libvorbisenc
3 * Mark Hills <mark@pogo.org.uk>
4 */
5
6 #include <time.h>
7
8 #include <vorbis/vorbisenc.h>
9
10 #include "avcodec.h"
11 #include "oggvorbis.h"
12
13 #define OGGVORBIS_FRAME_SIZE 1024
14
15
16 typedef struct OggVorbisContext {
17 vorbis_info vi ;
18 vorbis_dsp_state vd ;
19 vorbis_block vb ;
20
21 /* decoder */
22 vorbis_comment vc ;
23 } OggVorbisContext ;
24
25
26 int oggvorbis_init_encoder(vorbis_info *vi, AVCodecContext *avccontext) {
27
28 #ifdef OGGVORBIS_VBR_BY_ESTIMATE
29 /* variable bitrate by estimate */
30
31 return (vorbis_encode_setup_managed(vi, avccontext->channels,
32 avccontext->sample_rate, -1, avccontext->bit_rate, -1) ||
33 vorbis_encode_ctl(vi, OV_ECTL_RATEMANAGE_AVG, NULL) ||
34 vorbis_encode_setup_init(vi)) ;
35 #else
36 /* constant bitrate */
37
38 return vorbis_encode_init(vi, avccontext->channels,
39 avccontext->sample_rate, -1, avccontext->bit_rate, -1) ;
40 #endif
41 }
42
43
44 static int oggvorbis_encode_init(AVCodecContext *avccontext) {
45 OggVorbisContext *context = avccontext->priv_data ;
46
47 vorbis_info_init(&context->vi) ;
48 if(oggvorbis_init_encoder(&context->vi, avccontext) < 0) {
49 fprintf(stderr, "oggvorbis_encode_init: init_encoder failed") ;
50 return -1 ;
51 }
52 vorbis_analysis_init(&context->vd, &context->vi) ;
53 vorbis_block_init(&context->vd, &context->vb) ;
54
55 avccontext->frame_size = OGGVORBIS_FRAME_SIZE ;
56
57 avccontext->coded_frame= avcodec_alloc_frame();
58 avccontext->coded_frame->key_frame= 1;
59
60 return 0 ;
61 }
62
63
64 static int oggvorbis_encode_frame(AVCodecContext *avccontext,
65 unsigned char *packets,
66 int buf_size, void *data)
67 {
68 OggVorbisContext *context = avccontext->priv_data ;
69 float **buffer ;
70 ogg_packet op ;
71 signed char *audio = data ;
72 int l, samples = OGGVORBIS_FRAME_SIZE ;
73
74 buffer = vorbis_analysis_buffer(&context->vd, samples) ;
75
76 if(context->vi.channels == 1) {
77 for(l = 0 ; l < samples ; l++)
78 buffer[0][l]=((audio[l*2+1]<<8)|(0x00ff&(int)audio[l*2]))/32768.f;
79 } else {
80 for(l = 0 ; l < samples ; l++){
81 buffer[0][l]=((audio[l*4+1]<<8)|(0x00ff&(int)audio[l*4]))/32768.f;
82 buffer[1][l]=((audio[l*4+3]<<8)|(0x00ff&(int)audio[l*4+2]))/32768.f;
83 }
84 }
85
86 vorbis_analysis_wrote(&context->vd, samples) ;
87
88 l = 0 ;
89
90 while(vorbis_analysis_blockout(&context->vd, &context->vb) == 1) {
91 vorbis_analysis(&context->vb, NULL);
92 vorbis_bitrate_addblock(&context->vb) ;
93
94 while(vorbis_bitrate_flushpacket(&context->vd, &op)) {
95 memcpy(packets + l, &op, sizeof(ogg_packet)) ;
96 memcpy(packets + l + sizeof(ogg_packet), op.packet, op.bytes) ;
97 l += sizeof(ogg_packet) + op.bytes ;
98 }
99 }
100
101 return l ;
102 }
103
104
105 static int oggvorbis_encode_close(AVCodecContext *avccontext) {
106 OggVorbisContext *context = avccontext->priv_data ;
107 /* ogg_packet op ; */
108
109 vorbis_analysis_wrote(&context->vd, 0) ; /* notify vorbisenc this is EOF */
110
111 /* We need to write all the remaining packets into the stream
112 * on closing */
113
114 fprintf(stderr, "fixme: not all packets written on oggvorbis_encode_close()\n") ;
115
116 /*
117 while(vorbis_bitrate_flushpacket(&context->vd, &op)) {
118 memcpy(packets + l, &op, sizeof(ogg_packet)) ;
119 memcpy(packets + l + sizeof(ogg_packet), op.packet, op.bytes) ;
120 l += sizeof(ogg_packet) + op.bytes ;
121 }
122 */
123
124 vorbis_block_clear(&context->vb);
125 vorbis_dsp_clear(&context->vd);
126 vorbis_info_clear(&context->vi);
127
128 av_freep(&avccontext->coded_frame);
129
130 return 0 ;
131 }
132
133
134 AVCodec oggvorbis_encoder = {
135 "vorbis",
136 CODEC_TYPE_AUDIO,
137 CODEC_ID_VORBIS,
138 sizeof(OggVorbisContext),
139 oggvorbis_encode_init,
140 oggvorbis_encode_frame,
141 oggvorbis_encode_close
142 } ;
143
144
145 static int oggvorbis_decode_init(AVCodecContext *avccontext) {
146 OggVorbisContext *context = avccontext->priv_data ;
147
148 vorbis_info_init(&context->vi) ;
149 vorbis_comment_init(&context->vc) ;
150
151 return 0 ;
152 }
153
154
155 static inline int conv(int samples, float **pcm, char *buf, int channels) {
156 int i, j, val ;
157 ogg_int16_t *ptr, *data = (ogg_int16_t*)buf ;
158 float *mono ;
159
160 for(i = 0 ; i < channels ; i++){
161 ptr = &data[i];
162 mono = pcm[i] ;
163
164 for(j = 0 ; j < samples ; j++) {
165
166 val = mono[j] * 32767.f;
167
168 if(val > 32767) val = 32767 ;
169 if(val < -32768) val = -32768 ;
170
171 *ptr = val ;
172 ptr += channels;
173 }
174 }
175
176 return 0 ;
177 }
178
179
180 static int oggvorbis_decode_frame(AVCodecContext *avccontext,
181 void *data, int *data_size,
182 UINT8 *buf, int buf_size)
183 {
184 OggVorbisContext *context = avccontext->priv_data ;
185 ogg_packet *op = (ogg_packet*)buf ;
186 float **pcm ;
187 int samples, total_samples, total_bytes ;
188
189 op->packet = (char*)op + sizeof(ogg_packet) ; /* correct data pointer */
190
191 if(op->packetno < 3) {
192 vorbis_synthesis_headerin(&context->vi, &context->vc, op) ;
193 return buf_size ;
194 }
195
196 if(op->packetno == 3) {
197 fprintf(stderr, "vorbis_decode: %d channel, %ldHz, encoder `%s'\n",
198 context->vi.channels, context->vi.rate, context->vc.vendor);
199
200 avccontext->channels = context->vi.channels ;
201 avccontext->sample_rate = context->vi.rate ;
202
203 vorbis_synthesis_init(&context->vd, &context->vi) ;
204 vorbis_block_init(&context->vd, &context->vb);
205 }
206
207 if(vorbis_synthesis(&context->vb, op) == 0)
208 vorbis_synthesis_blockin(&context->vd, &context->vb) ;
209
210 total_samples = 0 ;
211 total_bytes = 0 ;
212
213 while((samples = vorbis_synthesis_pcmout(&context->vd, &pcm)) > 0) {
214 conv(samples, pcm, (char*)data + total_bytes, context->vi.channels) ;
215 total_bytes += samples * 2 * context->vi.channels ;
216 total_samples += samples ;
217 vorbis_synthesis_read(&context->vd, samples) ;
218 }
219
220 *data_size = total_bytes ;
221 return buf_size ;
222 }
223
224
225 static int oggvorbis_decode_close(AVCodecContext *avccontext) {
226 OggVorbisContext *context = avccontext->priv_data ;
227
228 vorbis_info_clear(&context->vi) ;
229 vorbis_comment_clear(&context->vc) ;
230
231 return 0 ;
232 }
233
234
235 AVCodec oggvorbis_decoder = {
236 "vorbis",
237 CODEC_TYPE_AUDIO,
238 CODEC_ID_VORBIS,
239 sizeof(OggVorbisContext),
240 oggvorbis_decode_init,
241 NULL,
242 oggvorbis_decode_close,
243 oggvorbis_decode_frame,
244 } ;