Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / libvorbisdec.c
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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
27typedef 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
35static int oggvorbis_decode_init(AVCodecContext *avccontext) {
36 OggVorbisDecContext *context = avccontext->priv_data ;
37 uint8_t *p= avccontext->extradata;
f6fa7814 38 int i, hsizes[3], ret;
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39 unsigned char *headers[3], *extradata = avccontext->extradata;
40
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41 if(! avccontext->extradata_size || ! p) {
42 av_log(avccontext, AV_LOG_ERROR, "vorbis extradata absent\n");
f6fa7814 43 return AVERROR(EINVAL);
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44 }
45
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46 vorbis_info_init(&context->vi) ;
47 vorbis_comment_init(&context->vc) ;
48
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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");
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68 ret = AVERROR_INVALIDDATA;
69 goto error;
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70 }
71 hsizes[i] += *p;
72 offset++;
73 p++;
74 }
75 hsizes[2] = avccontext->extradata_size - hsizes[0]-hsizes[1]-offset;
76#if 0
77 av_log(avccontext, AV_LOG_DEBUG,
78 "vorbis header sizes: %d, %d, %d, / extradata_len is %d \n",
79 hsizes[0], hsizes[1], hsizes[2], avccontext->extradata_size);
80#endif
81 headers[0] = extradata + offset;
82 headers[1] = extradata + offset + hsizes[0];
83 headers[2] = extradata + offset + hsizes[0] + hsizes[1];
84 } else {
85 av_log(avccontext, AV_LOG_ERROR,
86 "vorbis initial header len is wrong: %d\n", *p);
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87 ret = AVERROR_INVALIDDATA;
88 goto error;
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89 }
90
91 for(i=0; i<3; i++){
92 context->op.b_o_s= i==0;
93 context->op.bytes = hsizes[i];
94 context->op.packet = headers[i];
95 if(vorbis_synthesis_headerin(&context->vi, &context->vc, &context->op)<0){
96 av_log(avccontext, AV_LOG_ERROR, "%d. vorbis header damaged\n", i+1);
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97 ret = AVERROR_INVALIDDATA;
98 goto error;
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99 }
100 }
101
102 avccontext->channels = context->vi.channels;
103 avccontext->sample_rate = context->vi.rate;
104 avccontext->sample_fmt = AV_SAMPLE_FMT_S16;
105 avccontext->time_base= (AVRational){1, avccontext->sample_rate};
106
107 vorbis_synthesis_init(&context->vd, &context->vi);
108 vorbis_block_init(&context->vd, &context->vb);
109
110 return 0 ;
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111
112 error:
113 vorbis_info_clear(&context->vi);
114 vorbis_comment_clear(&context->vc) ;
115 return ret;
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116}
117
118
119static inline int conv(int samples, float **pcm, char *buf, int channels) {
120 int i, j;
121 ogg_int16_t *ptr, *data = (ogg_int16_t*)buf ;
122 float *mono ;
123
124 for(i = 0 ; i < channels ; i++){
125 ptr = &data[i];
126 mono = pcm[i] ;
127
128 for(j = 0 ; j < samples ; j++) {
129 *ptr = av_clip_int16(mono[j] * 32767.f);
130 ptr += channels;
131 }
132 }
133
134 return 0 ;
135}
136
137static int oggvorbis_decode_frame(AVCodecContext *avccontext, void *data,
138 int *got_frame_ptr, AVPacket *avpkt)
139{
140 OggVorbisDecContext *context = avccontext->priv_data ;
141 AVFrame *frame = data;
142 float **pcm ;
143 ogg_packet *op= &context->op;
144 int samples, total_samples, total_bytes;
145 int ret;
146 int16_t *output;
147
148 if(!avpkt->size){
149 //FIXME flush
150 return 0;
151 }
152
153 frame->nb_samples = 8192*4;
154 if ((ret = ff_get_buffer(avccontext, frame, 0)) < 0)
155 return ret;
156 output = (int16_t *)frame->data[0];
157
158
159 op->packet = avpkt->data;
160 op->bytes = avpkt->size;
161
162// 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);
163
164/* for(i=0; i<op->bytes; i++)
165 av_log(avccontext, AV_LOG_DEBUG, "%02X ", op->packet[i]);
166 av_log(avccontext, AV_LOG_DEBUG, "\n");*/
167
168 if(vorbis_synthesis(&context->vb, op) == 0)
169 vorbis_synthesis_blockin(&context->vd, &context->vb) ;
170
171 total_samples = 0 ;
172 total_bytes = 0 ;
173
174 while((samples = vorbis_synthesis_pcmout(&context->vd, &pcm)) > 0) {
175 conv(samples, pcm, (char*)output + total_bytes, context->vi.channels) ;
176 total_bytes += samples * 2 * context->vi.channels ;
177 total_samples += samples ;
178 vorbis_synthesis_read(&context->vd, samples) ;
179 }
180
181 frame->nb_samples = total_samples;
182 *got_frame_ptr = total_samples > 0;
183 return avpkt->size;
184}
185
186
187static int oggvorbis_decode_close(AVCodecContext *avccontext) {
188 OggVorbisDecContext *context = avccontext->priv_data ;
189
190 vorbis_info_clear(&context->vi) ;
191 vorbis_comment_clear(&context->vc) ;
192
193 return 0 ;
194}
195
196
197AVCodec ff_libvorbis_decoder = {
198 .name = "libvorbis",
199 .long_name = NULL_IF_CONFIG_SMALL("libvorbis"),
200 .type = AVMEDIA_TYPE_AUDIO,
201 .id = AV_CODEC_ID_VORBIS,
202 .priv_data_size = sizeof(OggVorbisDecContext),
203 .init = oggvorbis_decode_init,
204 .decode = oggvorbis_decode_frame,
205 .close = oggvorbis_decode_close,
206 .capabilities = CODEC_CAP_DELAY,
207};