Revert "Create three ogg pages when skipping vorbis comments."
[paraslash.git] / ogg_afh_common.c
1 /*
2 * Copyright (C) 2004-2011 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 PARA_INFO_LOG("ogg page serial: %d\n",
41 ogg_page_serialno(&page));
42 while (i < 2) {
43 ret = ogg_stream_packetout(stream, &packet);
44 if (ret == 0)
45 break;
46 if (ret < 0)
47 return -E_STREAM_PACKETOUT;
48 ret = ci->packet_callback(&packet, i + 1,
49 ogg_page_serialno(&page), afhi,
50 ci->private_data);
51 if (ret < 0)
52 return ret;
53 if (ret == 0) /* header complete */
54 return 1;
55 i++;
56 }
57 }
58 }
59 return 1;
60 }
61
62 static int process_ogg_packets(ogg_sync_state *oss, struct afh_info *afhi,
63 struct ogg_afh_callback_info *ci)
64 {
65 ogg_packet packet;
66 ogg_stream_state stream;
67 ogg_page page;
68 int ret;
69
70 if (ogg_sync_pageout(oss, &page) != 1)
71 return -E_SYNC_PAGEOUT;
72
73 ret = ogg_page_serialno(&page);
74 ogg_stream_init(&stream, ret);
75
76 ret = -E_STREAM_PAGEIN;
77 if (ogg_stream_pagein(&stream, &page) < 0)
78 goto out;
79
80 ret = -E_STREAM_PACKETOUT;
81 if (ogg_stream_packetout(&stream, &packet) != 1)
82 goto out;
83 ret = ci->packet_callback(&packet, 0, ogg_page_serialno(&page),
84 afhi, ci->private_data);
85 if (ret < 0)
86 goto out;
87 ret = process_packets_2_and_3(oss, &stream, afhi, ci);
88 if (ret < 0)
89 goto out;
90 ret = 1;
91 out:
92 ogg_stream_clear(&stream);
93 return ret;
94 }
95
96 static void set_chunk_tv(int num_frames, int num_chunks, int frequency,
97 struct timeval *result)
98 {
99 uint64_t x = (uint64_t)num_frames * 1000 * 1000
100 / frequency / num_chunks;
101
102 result->tv_sec = x / 1000 / 1000;
103 result->tv_usec = x % (1000 * 1000);
104 PARA_INFO_LOG("%d chunks, chunk time: %lums\n", num_chunks,
105 tv2ms(result));
106 }
107
108 /**
109 * Pass first three ogg packets to callback and build the chunk table.
110 *
111 * This function extracts the first three ogg packets of the audio data
112 * given by \a map and \a numbytes and passes each packet to the callback
113 * defined by \a ci.
114 *
115 * If the packet callback indicates success and \a afhi is not \p NULL, the
116 * chunk table is built. Chunk zero contains the first three ogg packets while
117 * all other chunks consist of exactly one ogg page.
118 *
119 * \param map Audio file data.
120 * \param numbytes The length of \a map.
121 * \param afhi Passed to the packet callback, contains chunk table.
122 * \param ci The callback structure.
123 *
124 * \return Standard.
125 */
126 int ogg_get_file_info(char *map, size_t numbytes, struct afh_info *afhi,
127 struct ogg_afh_callback_info *ci)
128 {
129 ogg_sync_state oss;
130 ogg_page op;
131 long len = numbytes;
132 char *buf;
133 int ret, i, j, frames_per_chunk, ct_size;
134 long long unsigned num_frames = 0;
135
136 ogg_sync_init(&oss);
137 ret = -E_OGG_SYNC;
138 buf = ogg_sync_buffer(&oss, len);
139 if (!buf)
140 goto out;
141 memcpy(buf, map, len);
142 ret = -E_OGG_SYNC;
143 if (ogg_sync_wrote(&oss, len) < 0)
144 goto out;
145 ret = process_ogg_packets(&oss, afhi, ci);
146 if (ret < 0)
147 goto out;
148 if (!afhi)
149 goto out;
150 afhi->header_len = oss.returned;
151 oss.returned = 0;
152 oss.fill = numbytes;
153 /* count ogg packages and get duration of the file */
154 for (i = 0; ogg_sync_pageseek(&oss, &op) > 0; i++)
155 num_frames = ogg_page_granulepos(&op);
156 PARA_INFO_LOG("%d pages, %llu frames\n", i, num_frames);
157 ret = -E_OGG_EMPTY;
158 if (i == 0)
159 goto out;
160 afhi->seconds_total = num_frames / afhi->frequency;
161 /* use roughly one page per chunk */
162 frames_per_chunk = num_frames / i;
163 PARA_INFO_LOG("%lu seconds, %d frames/chunk\n",
164 afhi->seconds_total, frames_per_chunk);
165 ct_size = 250;
166 afhi->chunk_table = para_malloc(ct_size * sizeof(uint32_t));
167 afhi->chunk_table[0] = 0;
168 afhi->chunk_table[1] = afhi->header_len;
169 oss.returned = afhi->header_len;
170 oss.fill = numbytes;
171 for (j = 1; ogg_sync_pageseek(&oss, &op) > 0; /* nothing */) {
172 int granule = ogg_page_granulepos(&op);
173
174 while (granule > j * frames_per_chunk) {
175 j++;
176 if (j >= ct_size) {
177 ct_size *= 2;
178 afhi->chunk_table = para_realloc(
179 afhi->chunk_table,
180 ct_size * sizeof(uint32_t));
181 }
182 afhi->chunk_table[j] = oss.returned;
183 }
184 }
185 afhi->chunks_total = j;
186 set_chunk_tv(num_frames, j, afhi->frequency, &afhi->chunk_tv);
187 ret = 0;
188 out:
189 ogg_sync_clear(&oss);
190 return ret;
191 }