Merge branch 't/speex'
[paraslash.git] / ogg_afh_common.c
1 /*
2 * Copyright (C) 2004-2010 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file ogg_afh_common.c Functions common to ogg/vorbis and ogg/speex. */
8
9 #include <ogg/ogg.h>
10 #include <regex.h>
11
12 #include "para.h"
13 #include "afh.h"
14 #include "error.h"
15 #include "string.h"
16 #include "ogg_afh_common.h"
17
18
19 /* Taken from decoder_example.c of libvorbis-1.2.3. */
20 static int process_packets_2_and_3(ogg_sync_state *oss,
21 ogg_stream_state *stream, struct afh_info *afhi,
22 struct ogg_afh_callback_info *ci)
23 {
24 ogg_page page;
25 ogg_packet packet;
26 int i = 0;
27
28 while (i < 2) {
29 while (i < 2) {
30 int ret = ogg_sync_pageout(oss, &page);
31 if (ret == 0)
32 break; /* Need more data */
33 if (ret != 1)
34 continue;
35 /*
36 * We can ignore any errors here as they'll also become
37 * apparent at packetout.
38 */
39 ogg_stream_pagein(stream, &page);
40 while (i < 2) {
41 ret = ogg_stream_packetout(stream, &packet);
42 if (ret == 0)
43 break;
44 if (ret < 0)
45 return -E_STREAM_PACKETOUT;
46 ret = ci->packet_callback(&packet, i + 1, afhi,
47 ci->private_data);
48 if (ret < 0)
49 return ret;
50 if (ret == 0) /* header complete */
51 return 1;
52 i++;
53 }
54 }
55 }
56 return 1;
57 }
58
59 static int process_ogg_packets(ogg_sync_state *oss, struct afh_info *afhi,
60 struct ogg_afh_callback_info *ci)
61 {
62 ogg_packet packet;
63 ogg_stream_state stream;
64 ogg_page page;
65 int ret;
66
67 ret = -E_SYNC_PAGEOUT;
68 if (ogg_sync_pageout(oss, &page) != 1)
69 goto out;
70
71 ret = ogg_page_serialno(&page);
72 ogg_stream_init(&stream, ret);
73
74 ret = -E_STREAM_PAGEIN;
75 if (ogg_stream_pagein(&stream, &page) < 0)
76 goto out;
77
78 ret = -E_STREAM_PACKETOUT;
79 if (ogg_stream_packetout(&stream, &packet) != 1)
80 goto out;
81 ret = ci->packet_callback(&packet, 0, afhi, ci->private_data);
82 if (ret < 0)
83 goto out;
84 ret = process_packets_2_and_3(oss, &stream, afhi, ci);
85 if (ret < 0)
86 goto out;
87 afhi->header_offset = 0;
88 afhi->header_len = oss->returned;
89 ret = 1;
90 out:
91 ogg_stream_clear(&stream);
92 return ret;
93 }
94
95 static void set_chunk_tv(int num_frames, int num_chunks, int frequency,
96 struct timeval *result)
97 {
98 uint64_t x = (uint64_t)num_frames * 1000 * 1000
99 / frequency / num_chunks;
100
101 result->tv_sec = x / 1000 / 1000;
102 result->tv_usec = x % (1000 * 1000);
103 PARA_INFO_LOG("%d chunks, chunk time: %lums\n", num_chunks,
104 tv2ms(result));
105 }
106
107 /**
108 * Pass first three ogg packets to callback and build the chunk table.
109 *
110 * This function extracts the first three ogg packets of the audio data
111 * given by \a map and \a numbytes and passes each packet to the callback
112 * defined by \a ci.
113 *
114 * If the packet callback indicates success, the chunk table is built. Chunk
115 * zero contains the first three ogg packets while all other chunks consist of
116 * exactly one ogg page.
117 *
118 * \param map Audio file data.
119 * \param numbytes The length of \a map.
120 * \param afhi Passed to the packet callback, contains chunk table.
121 * \param ci The callback structure.
122 *
123 * \return Standard.
124 */
125 int ogg_get_file_info(char *map, size_t numbytes, struct afh_info *afhi,
126 struct ogg_afh_callback_info *ci)
127 {
128 ogg_sync_state oss;
129 ogg_page op;
130 long len = numbytes;
131 char *buf;
132 int ret, i, j, frames_per_chunk, ct_size;
133 long long unsigned num_frames = 0;
134
135 ogg_sync_init(&oss);
136 ret = -E_OGG_SYNC;
137 buf = ogg_sync_buffer(&oss, len);
138 if (!buf)
139 goto out;
140 memcpy(buf, map, len);
141 ret = -E_OGG_SYNC;
142 if (ogg_sync_wrote(&oss, len) < 0)
143 goto out;
144 ret = process_ogg_packets(&oss, afhi, ci);
145 if (ret < 0)
146 goto out;
147 oss.returned = 0;
148 oss.fill = numbytes;
149 /* count ogg packages and get duration of the file */
150 for (i = 0; ogg_sync_pageseek(&oss, &op) > 0; i++)
151 num_frames = ogg_page_granulepos(&op);
152 PARA_INFO_LOG("%d pages, %llu frames\n", i, num_frames);
153 ret = -E_OGG_EMPTY;
154 if (i == 0)
155 goto out;
156 afhi->seconds_total = num_frames / afhi->frequency;
157 /* use roughly one page per chunk */
158 frames_per_chunk = num_frames / i;
159 PARA_INFO_LOG("%lu seconds, %d frames/chunk\n",
160 afhi->seconds_total, frames_per_chunk);
161 ct_size = 250;
162 afhi->chunk_table = para_malloc(ct_size * sizeof(uint32_t));
163 afhi->chunk_table[0] = 0;
164 afhi->chunk_table[1] = afhi->header_len;
165 oss.returned = afhi->header_len;
166 oss.fill = numbytes;
167 for (i = 0, j = 1; ogg_sync_pageseek(&oss, &op) > 0; i++) {
168 int granule = ogg_page_granulepos(&op);
169
170 while (granule > j * frames_per_chunk) {
171 j++;
172 if (j >= ct_size) {
173 ct_size *= 2;
174 afhi->chunk_table = para_realloc(
175 afhi->chunk_table,
176 ct_size * sizeof(uint32_t));
177 }
178 afhi->chunk_table[j] = oss.returned;
179 }
180 }
181 afhi->chunks_total = j;
182 set_chunk_tv(num_frames, j, afhi->frequency, &afhi->chunk_tv);
183 ret = 0;
184 out:
185 ogg_sync_clear(&oss);
186 return ret;
187 }