ogg_afh: Comment fix.
[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 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 if (ogg_sync_pageout(oss, &page) != 1)
68 return -E_SYNC_PAGEOUT;
69
70 ret = ogg_page_serialno(&page);
71 ogg_stream_init(&stream, ret);
72
73 ret = -E_STREAM_PAGEIN;
74 if (ogg_stream_pagein(&stream, &page) < 0)
75 goto out;
76
77 ret = -E_STREAM_PACKETOUT;
78 if (ogg_stream_packetout(&stream, &packet) != 1)
79 goto out;
80 ret = ci->packet_callback(&packet, 0, afhi, ci->private_data);
81 if (ret < 0)
82 goto out;
83 ret = process_packets_2_and_3(oss, &stream, afhi, ci);
84 if (ret < 0)
85 goto out;
86 afhi->header_offset = 0;
87 afhi->header_len = oss->returned;
88 ret = 1;
89 out:
90 ogg_stream_clear(&stream);
91 return ret;
92 }
93
94 static void set_chunk_tv(int num_frames, int num_chunks, int frequency,
95 struct timeval *result)
96 {
97 uint64_t x = (uint64_t)num_frames * 1000 * 1000
98 / frequency / num_chunks;
99
100 result->tv_sec = x / 1000 / 1000;
101 result->tv_usec = x % (1000 * 1000);
102 PARA_INFO_LOG("%d chunks, chunk time: %lums\n", num_chunks,
103 tv2ms(result));
104 }
105
106 /**
107 * Pass first three ogg packets to callback and build the chunk table.
108 *
109 * This function extracts the first three ogg packets of the audio data
110 * given by \a map and \a numbytes and passes each packet to the callback
111 * defined by \a ci.
112 *
113 * If the packet callback indicates success, the chunk table is built. Chunk
114 * zero contains the first three ogg packets while all other chunks consist of
115 * exactly one ogg page.
116 *
117 * \param map Audio file data.
118 * \param numbytes The length of \a map.
119 * \param afhi Passed to the packet callback, contains chunk table.
120 * \param ci The callback structure.
121 *
122 * \return Standard.
123 */
124 int ogg_get_file_info(char *map, size_t numbytes, struct afh_info *afhi,
125 struct ogg_afh_callback_info *ci)
126 {
127 ogg_sync_state oss;
128 ogg_page op;
129 long len = numbytes;
130 char *buf;
131 int ret, i, j, frames_per_chunk, ct_size;
132 long long unsigned num_frames = 0;
133
134 ogg_sync_init(&oss);
135 ret = -E_OGG_SYNC;
136 buf = ogg_sync_buffer(&oss, len);
137 if (!buf)
138 goto out;
139 memcpy(buf, map, len);
140 ret = -E_OGG_SYNC;
141 if (ogg_sync_wrote(&oss, len) < 0)
142 goto out;
143 ret = process_ogg_packets(&oss, afhi, ci);
144 if (ret < 0)
145 goto out;
146 oss.returned = 0;
147 oss.fill = numbytes;
148 /* count ogg pages and get duration of the file */
149 for (i = 0; ogg_sync_pageseek(&oss, &op) > 0; i++)
150 num_frames = ogg_page_granulepos(&op);
151 PARA_INFO_LOG("%d pages, %llu frames\n", i, num_frames);
152 ret = -E_OGG_EMPTY;
153 if (i == 0)
154 goto out;
155 afhi->seconds_total = num_frames / afhi->frequency;
156 /* use roughly one page per chunk */
157 frames_per_chunk = num_frames / i;
158 PARA_INFO_LOG("%lu seconds, %d frames/chunk\n",
159 afhi->seconds_total, frames_per_chunk);
160 ct_size = 250;
161 afhi->chunk_table = para_malloc(ct_size * sizeof(uint32_t));
162 afhi->chunk_table[0] = 0;
163 afhi->chunk_table[1] = afhi->header_len;
164 oss.returned = afhi->header_len;
165 oss.fill = numbytes;
166 for (j = 1; ogg_sync_pageseek(&oss, &op) > 0; /* nothing */) {
167 int granule = ogg_page_granulepos(&op);
168
169 while (granule > j * frames_per_chunk) {
170 j++;
171 if (j >= ct_size) {
172 ct_size *= 2;
173 afhi->chunk_table = para_realloc(
174 afhi->chunk_table,
175 ct_size * sizeof(uint32_t));
176 }
177 afhi->chunk_table[j] = oss.returned;
178 }
179 }
180 afhi->chunks_total = j;
181 set_chunk_tv(num_frames, j, afhi->frequency, &afhi->chunk_tv);
182 ret = 0;
183 out:
184 ogg_sync_clear(&oss);
185 return ret;
186 }