1 /* libFLAC - Free Lossless Audio Codec
2 * Copyright (C) 2004,2005,2006,2007,2008,2009 Josh Coalson
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
8 * - Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * - Neither the name of the Xiph.org Foundation nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 #include <stdlib.h> /* for malloc() */
37 #include <string.h> /* for memcmp(), memcpy() */
38 #include "FLAC/assert.h"
39 #include "share/alloc.h"
40 #include "private/ogg_helper.h"
41 #include "protected/stream_encoder.h"
44 static FLAC__bool full_read_(FLAC__StreamEncoder *encoder, FLAC__byte *buffer, size_t bytes, FLAC__StreamEncoderReadCallback read_callback, void *client_data)
47 size_t bytes_read = bytes;
48 switch(read_callback(encoder, buffer, &bytes_read, client_data)) {
49 case FLAC__STREAM_ENCODER_READ_STATUS_CONTINUE:
53 case FLAC__STREAM_ENCODER_READ_STATUS_END_OF_STREAM:
55 encoder->protected_->state = FLAC__STREAM_ENCODER_OGG_ERROR;
61 case FLAC__STREAM_ENCODER_READ_STATUS_ABORT:
62 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
64 case FLAC__STREAM_ENCODER_READ_STATUS_UNSUPPORTED:
67 /* double protection: */
69 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
77 void simple_ogg_page__init(ogg_page *page)
85 void simple_ogg_page__clear(ogg_page *page)
91 simple_ogg_page__init(page);
94 FLAC__bool simple_ogg_page__get_at(FLAC__StreamEncoder *encoder, FLAC__uint64 position, ogg_page *page, FLAC__StreamEncoderSeekCallback seek_callback, FLAC__StreamEncoderReadCallback read_callback, void *client_data)
96 static const unsigned OGG_HEADER_FIXED_PORTION_LEN = 27;
97 static const unsigned OGG_MAX_HEADER_LEN = 27/*OGG_HEADER_FIXED_PORTION_LEN*/ + 255;
99 FLAC__StreamEncoderSeekStatus seek_status;
101 FLAC__ASSERT(page->header == 0);
102 FLAC__ASSERT(page->header_len == 0);
103 FLAC__ASSERT(page->body == 0);
104 FLAC__ASSERT(page->body_len == 0);
106 /* move the stream pointer to the supposed beginning of the page */
107 if(0 == seek_callback)
109 if((seek_status = seek_callback((FLAC__StreamEncoder*)encoder, position, client_data)) != FLAC__STREAM_ENCODER_SEEK_STATUS_OK) {
110 if(seek_status == FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR)
111 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
115 /* allocate space for the page header */
116 if(0 == (page->header = safe_malloc_(OGG_MAX_HEADER_LEN))) {
117 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
121 /* read in the fixed part of the page header (up to but not including
122 * the segment table */
123 if(!full_read_(encoder, page->header, OGG_HEADER_FIXED_PORTION_LEN, read_callback, client_data))
126 page->header_len = OGG_HEADER_FIXED_PORTION_LEN + page->header[26];
128 /* check to see if it's a correct, "simple" page (one packet only) */
130 memcmp(page->header, "OggS", 4) || /* doesn't start with OggS */
131 (page->header[5] & 0x01) || /* continued packet */
132 memcmp(page->header+6, "\0\0\0\0\0\0\0\0", 8) || /* granulepos is non-zero */
133 page->header[26] == 0 /* packet is 0-size */
135 encoder->protected_->state = FLAC__STREAM_ENCODER_OGG_ERROR;
139 /* read in the segment table */
140 if(!full_read_(encoder, page->header + OGG_HEADER_FIXED_PORTION_LEN, page->header[26], read_callback, client_data))
146 /* check to see that it specifies a single packet */
147 for(i = 0; i < (unsigned)page->header[26] - 1; i++) {
148 if(page->header[i + OGG_HEADER_FIXED_PORTION_LEN] != 255) {
149 encoder->protected_->state = FLAC__STREAM_ENCODER_OGG_ERROR;
154 page->body_len = 255 * i + page->header[i + OGG_HEADER_FIXED_PORTION_LEN];
157 /* allocate space for the page body */
158 if(0 == (page->body = safe_malloc_(page->body_len))) {
159 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
163 /* read in the page body */
164 if(!full_read_(encoder, page->body, page->body_len, read_callback, client_data))
168 memcpy(crc, page->header+22, 4);
169 ogg_page_checksum_set(page);
170 if(memcmp(crc, page->header+22, 4)) {
171 encoder->protected_->state = FLAC__STREAM_ENCODER_OGG_ERROR;
178 FLAC__bool simple_ogg_page__set_at(FLAC__StreamEncoder *encoder, FLAC__uint64 position, ogg_page *page, FLAC__StreamEncoderSeekCallback seek_callback, FLAC__StreamEncoderWriteCallback write_callback, void *client_data)
180 FLAC__StreamEncoderSeekStatus seek_status;
182 FLAC__ASSERT(page->header != 0);
183 FLAC__ASSERT(page->header_len != 0);
184 FLAC__ASSERT(page->body != 0);
185 FLAC__ASSERT(page->body_len != 0);
187 /* move the stream pointer to the supposed beginning of the page */
188 if(0 == seek_callback)
190 if((seek_status = seek_callback((FLAC__StreamEncoder*)encoder, position, client_data)) != FLAC__STREAM_ENCODER_SEEK_STATUS_OK) {
191 if(seek_status == FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR)
192 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
196 ogg_page_checksum_set(page);
198 /* re-write the page */
199 if(write_callback((FLAC__StreamEncoder*)encoder, page->header, page->header_len, 0, 0, client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK) {
200 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
203 if(write_callback((FLAC__StreamEncoder*)encoder, page->body, page->body_len, 0, 0, client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK) {
204 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;