1 /* libFLAC - Free Lossless Audio Codec 2 * Copyright (C) 2002,2003,2004,2005,2006,2007 Josh Coalson 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * - Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 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. 14 * 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. 18 * 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. 30 */ 31 32 #if HAVE_CONFIG_H 33 # include <config.h> 34 #endif 35 36 #include <string.h> /* for memset() */ 37 #include "FLAC/assert.h" 38 #include "private/ogg_encoder_aspect.h" 39 #include "private/ogg_mapping.h" 40 41 static const FLAC__byte FLAC__OGG_MAPPING_VERSION_MAJOR = 1; 42 static const FLAC__byte FLAC__OGG_MAPPING_VERSION_MINOR = 0; 43 44 /*********************************************************************** 45 * 46 * Public class methods 47 * 48 ***********************************************************************/ 49 50 FLAC__bool FLAC__ogg_encoder_aspect_init(FLAC__OggEncoderAspect *aspect) 51 { 52 /* we will determine the serial number later if necessary */ 53 if(ogg_stream_init(&aspect->stream_state, aspect->serial_number) != 0) 54 return false; 55 56 aspect->seen_magic = false; 57 aspect->is_first_packet = true; 58 aspect->samples_written = 0; 59 60 return true; 61 } 62 63 void FLAC__ogg_encoder_aspect_finish(FLAC__OggEncoderAspect *aspect) 64 { 65 (void)ogg_stream_clear(&aspect->stream_state); 66 /*@@@ what about the page? */ 67 } 68 69 void FLAC__ogg_encoder_aspect_set_serial_number(FLAC__OggEncoderAspect *aspect, long value) 70 { 71 aspect->serial_number = value; 72 } 73 74 FLAC__bool FLAC__ogg_encoder_aspect_set_num_metadata(FLAC__OggEncoderAspect *aspect, unsigned value) 75 { 76 if(value < (1u << FLAC__OGG_MAPPING_NUM_HEADERS_LEN)) { 77 aspect->num_metadata = value; 78 return true; 79 } 80 else 81 return false; 82 } 83 84 void FLAC__ogg_encoder_aspect_set_defaults(FLAC__OggEncoderAspect *aspect) 85 { 86 aspect->serial_number = 0; 87 aspect->num_metadata = 0; 88 } 89 90 /* 91 * The basic FLAC -> Ogg mapping goes like this: 92 * 93 * - 'fLaC' magic and STREAMINFO block get combined into the first 94 * packet. The packet is prefixed with 95 * + the one-byte packet type 0x7F 96 * + 'FLAC' magic 97 * + the 2 byte Ogg FLAC mapping version number 98 * + tne 2 byte big-endian # of header packets 99 * - The first packet is flushed to the first page. 100 * - Each subsequent metadata block goes into its own packet. 101 * - Each metadata packet is flushed to page (this is not required, 102 * the mapping only requires that a flush must occur after all 103 * metadata is written). 104 * - Each subsequent FLAC audio frame goes into its own packet. 105 * 106 * WATCHOUT: 107 * This depends on the behavior of FLAC__StreamEncoder that we get a 108 * separate write callback for the fLaC magic, and then separate write 109 * callbacks for each metadata block and audio frame. 110 */ 111 FLAC__StreamEncoderWriteStatus FLAC__ogg_encoder_aspect_write_callback_wrapper(FLAC__OggEncoderAspect *aspect, const FLAC__byte buffer[], size_t bytes, unsigned samples, unsigned current_frame, FLAC__bool is_last_block, FLAC__OggEncoderAspectWriteCallbackProxy write_callback, void *encoder, void *client_data) 112 { 113 /* WATCHOUT: 114 * This depends on the behavior of FLAC__StreamEncoder that 'samples' 115 * will be 0 for metadata writes. 116 */ 117 const FLAC__bool is_metadata = (samples == 0); 118 119 /* 120 * Treat fLaC magic packet specially. We will note when we see it, then 121 * wait until we get the STREAMINFO and prepend it in that packet 122 */ 123 if(aspect->seen_magic) { 124 ogg_packet packet; 125 FLAC__byte synthetic_first_packet_body[ 126 FLAC__OGG_MAPPING_PACKET_TYPE_LENGTH + 127 FLAC__OGG_MAPPING_MAGIC_LENGTH + 128 FLAC__OGG_MAPPING_VERSION_MAJOR_LENGTH + 129 FLAC__OGG_MAPPING_VERSION_MINOR_LENGTH + 130 FLAC__OGG_MAPPING_NUM_HEADERS_LENGTH + 131 FLAC__STREAM_SYNC_LENGTH + 132 FLAC__STREAM_METADATA_HEADER_LENGTH + 133 FLAC__STREAM_METADATA_STREAMINFO_LENGTH 134 ]; 135 136 memset(&packet, 0, sizeof(packet)); 137 packet.granulepos = aspect->samples_written + samples; 138 139 if(aspect->is_first_packet) { 140 FLAC__byte *b = synthetic_first_packet_body; 141 if(bytes != FLAC__STREAM_METADATA_HEADER_LENGTH + FLAC__STREAM_METADATA_STREAMINFO_LENGTH) { 142 /* 143 * If we get here, our assumption about the way write callbacks happen 144 * (explained above) is wrong 145 */ 146 FLAC__ASSERT(0); 147 return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR; 148 } 149 /* add first header packet type */ 150 *b = FLAC__OGG_MAPPING_FIRST_HEADER_PACKET_TYPE; 151 b += FLAC__OGG_MAPPING_PACKET_TYPE_LENGTH; 152 /* add 'FLAC' mapping magic */ 153 memcpy(b, FLAC__OGG_MAPPING_MAGIC, FLAC__OGG_MAPPING_MAGIC_LENGTH); 154 b += FLAC__OGG_MAPPING_MAGIC_LENGTH; 155 /* add Ogg FLAC mapping major version number */ 156 memcpy(b, &FLAC__OGG_MAPPING_VERSION_MAJOR, FLAC__OGG_MAPPING_VERSION_MAJOR_LENGTH); 157 b += FLAC__OGG_MAPPING_VERSION_MAJOR_LENGTH; 158 /* add Ogg FLAC mapping minor version number */ 159 memcpy(b, &FLAC__OGG_MAPPING_VERSION_MINOR, FLAC__OGG_MAPPING_VERSION_MINOR_LENGTH); 160 b += FLAC__OGG_MAPPING_VERSION_MINOR_LENGTH; 161 /* add number of header packets */ 162 *b = (FLAC__byte)(aspect->num_metadata >> 8); 163 b++; 164 *b = (FLAC__byte)(aspect->num_metadata); 165 b++; 166 /* add native FLAC 'fLaC' magic */ 167 memcpy(b, FLAC__STREAM_SYNC_STRING, FLAC__STREAM_SYNC_LENGTH); 168 b += FLAC__STREAM_SYNC_LENGTH; 169 /* add STREAMINFO */ 170 memcpy(b, buffer, bytes); 171 FLAC__ASSERT(b + bytes - synthetic_first_packet_body == sizeof(synthetic_first_packet_body)); 172 packet.packet = (unsigned char *)synthetic_first_packet_body; 173 packet.bytes = sizeof(synthetic_first_packet_body); 174 175 packet.b_o_s = 1; 176 aspect->is_first_packet = false; 177 } 178 else { 179 packet.packet = (unsigned char *)buffer; 180 packet.bytes = bytes; 181 } 182 183 if(is_last_block) { 184 /* we used to check: 185 * FLAC__ASSERT(total_samples_estimate == 0 || total_samples_estimate == aspect->samples_written + samples); 186 * but it's really not useful since total_samples_estimate is an estimate and can be inexact 187 */ 188 packet.e_o_s = 1; 189 } 190 191 if(ogg_stream_packetin(&aspect->stream_state, &packet) != 0) 192 return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR; 193 194 /*@@@ can't figure out a way to pass a useful number for 'samples' to the write_callback, so we'll just pass 0 */ 195 if(is_metadata) { 196 while(ogg_stream_flush(&aspect->stream_state, &aspect->page) != 0) { 197 if(write_callback(encoder, aspect->page.header, aspect->page.header_len, 0, current_frame, client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK) 198 return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR; 199 if(write_callback(encoder, aspect->page.body, aspect->page.body_len, 0, current_frame, client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK) 200 return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR; 201 } 202 } 203 else { 204 while(ogg_stream_pageout(&aspect->stream_state, &aspect->page) != 0) { 205 if(write_callback(encoder, aspect->page.header, aspect->page.header_len, 0, current_frame, client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK) 206 return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR; 207 if(write_callback(encoder, aspect->page.body, aspect->page.body_len, 0, current_frame, client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK) 208 return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR; 209 } 210 } 211 } 212 else if(is_metadata && current_frame == 0 && samples == 0 && bytes == 4 && 0 == memcmp(buffer, FLAC__STREAM_SYNC_STRING, sizeof(FLAC__STREAM_SYNC_STRING))) { 213 aspect->seen_magic = true; 214 } 215 else { 216 /* 217 * If we get here, our assumption about the way write callbacks happen 218 * explained above is wrong 219 */ 220 FLAC__ASSERT(0); 221 return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR; 222 } 223 224 aspect->samples_written += samples; 225 226 return FLAC__STREAM_ENCODER_WRITE_STATUS_OK; 227 } 228
