2 * Copyright (C) 2009 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file wma_afh.c The audio format handler for WMA files. */
11 #include <sys/types.h>
22 #include "portable_io.h"
26 #define FOR_EACH_FRAME(_f, _buf, _size, _ba) for (_f = (_buf); \
27 _f + (_ba) + WMA_FRAME_SKIP < (_buf) + (_size); \
28 _f += (_ba) + WMA_FRAME_SKIP)
31 * Must be called on a frame boundary, e.g. start + header_len.
32 * \return Frame count, superframe count via *num_superframes.
34 static int count_frames(const char *buf, int buf_size, int block_align,
37 int fc = 0, sfc = 0; /* frame count, superframe count */
41 FOR_EACH_FRAME(p, (uint8_t *)buf, buf_size, block_align) {
42 fc += p[WMA_FRAME_SKIP] & 0x0f;
45 PARA_INFO_LOG("%d frames, %d superframes\n", fc, sfc);
47 *num_superframes = sfc;
52 * put_utf8() and get_str16() below are based on macros in libavutil/common.h
53 * of the mplayer source code, copyright (c) 2006 Michael Niedermayer
58 * Convert a 32-bit Unicode character to its UTF-8 encoded form.
60 * Writes up to 4 bytes for values in the valid UTF-8 range and up to 7 bytes
61 * in the general case, depending on the length of the converted Unicode
64 * \param result Where the converted UTF-8 bytes are written.
66 static int put_utf8(uint32_t val, char *result)
76 bytes = (wma_log2(in) + 4) / 5;
77 shift = (bytes - 1) * 6;
78 *out++ = (256 - (256 >> bytes)) | (in >> shift);
81 *out++ = 0x80 | ((in >> shift) & 0x3f);
86 static void get_str16(const char *in, int len, char *out, int out_size)
92 while (len-- && q + 7 + 1 < out + out_size) {
93 uint32_t x = read_u16(p);
102 static const char comment_header[] = {
103 0x33, 0x26, 0xb2, 0x75, 0x8E, 0x66, 0xCF, 0x11,
104 0xa6, 0xd9, 0x00, 0xaa, 0x00, 0x62, 0xce, 0x6c
107 static const char extended_content_header[] = {
108 0x40, 0xA4, 0xD0, 0xD2, 0x07, 0xE3, 0xD2, 0x11,
109 0x97, 0xF0, 0x00, 0xA0, 0xC9, 0x5E, 0xA8, 0x50
112 static const char year_tag_header[] = { /* WM/Year */
113 0x57, 0x00, 0x4d, 0x00, 0x2f, 0x00, 0x59, 0x00,
114 0x65, 0x00, 0x61, 0x00, 0x72, 0x00
117 static const char album_tag_header[] = { /* WM/AlbumTitle */
118 0x57, 0x00, 0x4d, 0x00, 0x2f, 0x00, 0x41, 0x00,
119 0x6c, 0x00, 0x62, 0x00, 0x75, 0x00, 0x6d, 0x00,
120 0x54, 0x00, 0x69, 0x00, 0x74, 0x00, 0x6c, 0x00,
124 static void read_asf_tags(const char *buf, int buf_size, struct taginfo *ti)
126 const char *p, *end = buf + buf_size;
129 p = search_pattern(comment_header, sizeof(comment_header),
132 int len1, len2, len3, len4, len5;
144 /* TODO: Check len values */
145 get_str16(p, len1, tag, sizeof(tag));
146 ti->title = para_strdup(tag);
147 PARA_INFO_LOG("title: %s\n", tag);
148 get_str16(p + len1, len2, tag, sizeof(tag));
149 ti->artist = para_strdup(tag);
150 PARA_INFO_LOG("artist: %s\n", tag);
151 get_str16(p + len1 + len2 + len3 + len4, len5, tag, sizeof(tag));
152 ti->comment = para_strdup(tag);
153 PARA_INFO_LOG("comment: %s\n", tag);
155 PARA_NOTICE_LOG("comment header not found\n");
156 p = search_pattern(extended_content_header, sizeof(extended_content_header),
161 q = search_pattern(year_tag_header, sizeof(year_tag_header),
164 const char *r = q + sizeof(year_tag_header) + 6;
165 get_str16(r, end - r, tag, sizeof(tag));
166 ti->year = para_strdup(tag);
167 PARA_INFO_LOG("year: %s\n", tag);
169 q = search_pattern(album_tag_header, sizeof(album_tag_header),
172 const char *r = q + sizeof(album_tag_header) + 6;
173 get_str16(r, end - r, tag, sizeof(tag));
174 ti->album = para_strdup(tag);
175 PARA_INFO_LOG("album: %s\n", tag);
179 PARA_NOTICE_LOG("extended content header not found\n");
183 static void set_chunk_tv(int num_frames, int num_chunks, int frequency,
184 struct timeval *result)
186 uint64_t x = (uint64_t)num_frames * 1000 * 1000
187 / frequency / num_chunks;
189 result->tv_sec = x / 1000 / 1000;
190 result->tv_usec = x % (1000 * 1000);
191 PARA_INFO_LOG("%d chunks, chunk time: %lums\n", num_chunks,
195 /* Must be called on a frame boundary. */
196 static int wma_make_chunk_table(char *buf, size_t buf_size, int block_align,
197 struct afh_info *afhi)
199 const uint8_t *f, *start = (uint8_t *)buf;
200 int i, j, frames_per_chunk, chunk_time;
201 size_t ct_size = 250;
202 int ret, count = 0, num_frames, num_superframes;
204 afhi->chunk_table = para_malloc(ct_size * sizeof(uint32_t));
205 afhi->chunk_table[0] = 0;
206 afhi->chunk_table[1] = afhi->header_len;
208 num_frames = count_frames(buf, buf_size, block_align,
211 if (num_frames == 0 || num_superframes == 0)
213 afhi->seconds_total = num_frames * 2048 /* FIXME */
215 frames_per_chunk = num_frames / num_superframes;
216 PARA_INFO_LOG("%d frames per chunk\n", frames_per_chunk);
219 FOR_EACH_FRAME(f, start, buf_size, block_align) {
220 count += f[WMA_FRAME_SKIP] & 0x0f;
221 while (count > j * frames_per_chunk) {
225 afhi->chunk_table = para_realloc(
227 ct_size * sizeof(uint32_t));
229 afhi->chunk_table[j] = f - start + afhi->header_len + block_align + WMA_FRAME_SKIP;
232 afhi->chunks_total = j;
233 set_chunk_tv(num_frames * 2048, j + 10 /* FIXME */, afhi->frequency, &afhi->chunk_tv);
236 free(afhi->chunk_table);
240 static int wma_get_file_info(char *map, size_t numbytes, __a_unused int fd,
241 struct afh_info *afhi)
244 struct asf_header_info ahi;
246 ret = read_asf_header(map, numbytes, &ahi);
251 afhi->bitrate = ahi.bit_rate / 1000;
252 if (ahi.sample_rate == 0)
254 afhi->frequency = ahi.sample_rate;
255 afhi->channels = ahi.channels;
256 afhi->header_len = ahi.header_len;
257 afhi->header_offset = 0;
258 wma_make_chunk_table(map + ahi.header_len, numbytes - ahi.header_len,
259 ahi.block_align, afhi);
260 read_asf_tags(map, ahi.header_len, &afhi->tags);
264 static const char* wma_suffixes[] = {"wma", NULL};
267 * The init function of the wma audio format handler.
269 * \param afh Pointer to the struct to initialize.
271 void wma_afh_init(struct audio_format_handler *afh)
273 afh->get_file_info = wma_get_file_info;
274 afh->suffixes = wma_suffixes;