ogg_afh.c

   1 /*
   2  * Copyright (C) 2004 Andre Noll <maan@tuebingen.mpg.de>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file ogg_afh.c Audio format handler for ogg/vorbis files. */
   8
   9 #include <vorbis/codec.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 struct private_vorbis_data {
  19         vorbis_info vi;
  20         vorbis_comment vc;
  21 };
  22
  23 /*
  24  * Vorbis uses three header packets, all of which are required: the
  25  * identification header, the comments header, and the setup header.
  26  *
  27  * The identification header identifies the bitstream as Vorbis. It contains
  28  * the Vorbis version and simple audio characteristics of the stream such as
  29  * sample rate and number of channels.
  30  *
  31  * The comment header includes user text comments (tags) and a vendor string
  32  * for the application/library that produced the bitstream.
  33  *
  34  * The setup header includes extensive CODEC setup information as well as the
  35  * complete VQ and Huffman codebooks needed for decoding.
  36  */
  37 static int vorbis_packet_callback(ogg_packet *packet, int packet_num,
  38                 __a_unused int serial, struct afh_info *afhi, void *private_data)
  39 {
  40         struct private_vorbis_data *pvd = private_data;
  41
  42         if (vorbis_synthesis_headerin(&pvd->vi, &pvd->vc, packet) < 0)
  43                 return -E_VORBIS;
  44         if (packet_num == 0) {
  45                 if (pvd->vi.rate == 0)
  46                         return -E_VORBIS;
  47                 afhi->channels = pvd->vi.channels;
  48                 afhi->frequency = pvd->vi.rate;
  49                 afhi->bitrate = pvd->vi.bitrate_nominal / 1000;
  50                 PARA_DEBUG_LOG("channels: %i, sampling rate: %i, bitrate: %i\n",
  51                         afhi->channels, afhi->frequency, afhi->bitrate);
  52                 return 1;
  53         }
  54         if (packet_num == 1)
  55                 return 1; /* we also want to have packet #2 */
  56         afhi->tags.artist = para_strdup(vorbis_comment_query(&pvd->vc, "artist", 0));
  57         afhi->tags.title = para_strdup(vorbis_comment_query(&pvd->vc, "title", 0));
  58         afhi->tags.album = para_strdup(vorbis_comment_query(&pvd->vc, "album", 0));
  59         afhi->tags.year = para_strdup(vorbis_comment_query(&pvd->vc, "year", 0));
  60         afhi->tags.comment = para_strdup(vorbis_comment_query(&pvd->vc, "comment", 0));
  61         return 0;
  62 }
  63
  64 static int ogg_vorbis_get_file_info(char *map, size_t numbytes, __a_unused int fd,
  65                 struct afh_info *afhi)
  66 {
  67         int ret;
  68         struct private_vorbis_data pvd;
  69         struct ogg_afh_callback_info vorbis_callback_info = {
  70                 .packet_callback = vorbis_packet_callback,
  71                 .private_data = &pvd,
  72         };
  73
  74         vorbis_info_init(&pvd.vi);
  75         vorbis_comment_init(&pvd.vc);
  76         ret = ogg_get_file_info(map, numbytes, afhi, &vorbis_callback_info);
  77         vorbis_info_clear(&pvd.vi);
  78         vorbis_comment_clear(&pvd.vc);
  79         return ret;
  80 }
  81
  82 struct vorbis_get_header_data {
  83         ogg_stream_state os;
  84         char *buf;
  85         size_t len;
  86 };
  87
  88 static void add_ogg_page(ogg_page *og, struct vorbis_get_header_data *vghd)
  89 {
  90         size_t old_len = vghd->len;
  91         size_t new_len = vghd->len + og->header_len + og->body_len;
  92         char *buf = para_realloc(vghd->buf, new_len), *p = buf + old_len;
  93
  94         memcpy(p, og->header, og->header_len);
  95         memcpy(p + og->header_len, og->body, og->body_len);
  96         vghd->buf = buf;
  97         vghd->len = new_len;
  98         PARA_DEBUG_LOG("header/body/old/new: %lu/%lu/%zu/%zu\n",
  99                 og->header_len, og->body_len, old_len, new_len);
 100 }
 101
 102 static int vorbis_get_header_callback(ogg_packet *packet, int packet_num,
 103                 int serial, __a_unused struct afh_info *afhi, void *private_data)
 104 {
 105         int ret;
 106         struct vorbis_get_header_data *vghd = private_data;
 107         ogg_page og;
 108         static unsigned char dummy_packet[] = {
 109                 0x03,
 110                 'v', 'o', 'r', 'b', 'i', 's',
 111                 0x06, 0x00, 0x00, 0x00,
 112                 'd', 'u', 'm', 'm', 'y', '\0',
 113                 0x00, 0x00, 0x00, 0x00, /* no comment :) */
 114                 0xff /* framing bit */
 115         };
 116
 117         PARA_DEBUG_LOG("processing ogg packet #%d\n", packet_num);
 118         if (packet_num > 2)
 119                 return 0;
 120         if (packet_num == 0) {
 121                 ogg_stream_init(&vghd->os, serial);
 122                 ret = ogg_stream_packetin(&vghd->os, packet);
 123                 if (ret < 0)
 124                         goto out;
 125                 ret = -E_OGG_STREAM_FLUSH;
 126                 if (ogg_stream_flush(&vghd->os, &og) == 0)
 127                         goto out;
 128                 add_ogg_page(&og, vghd);
 129                 return 1;
 130         }
 131         if (packet_num == 1) {
 132                 ogg_packet replacement = *packet;
 133                 PARA_INFO_LOG("replacing metadata packet\n");
 134                 replacement.packet = dummy_packet;
 135                 replacement.bytes = sizeof(dummy_packet);
 136                 ret = ogg_stream_packetin(&vghd->os, &replacement);
 137                 if (ret >= 0)
 138                         return 1;
 139                 ret = -E_OGG_PACKET_IN;
 140                 goto out;
 141         }
 142         ret = -E_OGG_PACKET_IN;
 143         if (ogg_stream_packetin(&vghd->os, packet) < 0)
 144                 goto out;
 145         while (ogg_stream_flush(&vghd->os, &og))
 146                 add_ogg_page(&og, vghd);
 147         ret = 0;
 148 out:
 149         ogg_stream_clear(&vghd->os);
 150         return ret;
 151 }
 152
 153 static void vorbis_get_header(void *map, size_t mapsize, char **buf,
 154                 size_t *len)
 155 {
 156         int ret;
 157         struct vorbis_get_header_data vghd = {.len = 0};
 158         struct ogg_afh_callback_info cb = {
 159                 .packet_callback = vorbis_get_header_callback,
 160                 .private_data = &vghd,
 161         };
 162
 163         ret = ogg_get_file_info(map, mapsize, NULL, &cb);
 164         if (ret < 0)
 165                 goto fail;
 166         *buf = vghd.buf;
 167         *len = vghd.len;
 168         PARA_INFO_LOG("created %zu byte ogg vorbis header\n", *len);
 169         return;
 170 fail:
 171         PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 172 }
 173
 174 static int vorbis_make_meta_packet(struct taginfo *tags, ogg_packet *result)
 175 {
 176         vorbis_comment vc;
 177         int ret;
 178
 179         vorbis_comment_init(&vc);
 180         vorbis_comment_add_tag(&vc, "artist", tags->artist);
 181         vorbis_comment_add_tag(&vc, "title", tags->title);
 182         vorbis_comment_add_tag(&vc, "album", tags->album);
 183         vorbis_comment_add_tag(&vc, "year", tags->year);
 184         vorbis_comment_add_tag(&vc, "comment", tags->comment);
 185         ret = vorbis_commentheader_out(&vc, result);
 186         vorbis_comment_clear(&vc);
 187         if (ret != 0)
 188                 return -E_VORBIS_COMMENTHEADER;
 189         return 1;
 190 }
 191
 192 static int vorbis_rewrite_tags(const char *map, size_t mapsize,
 193                 struct taginfo *tags, int output_fd,
 194                 __a_unused const char *filename)
 195 {
 196         int ret;
 197         ogg_packet packet;
 198
 199         ret = vorbis_make_meta_packet(tags, &packet);
 200         if (ret < 0)
 201                 return ret;
 202         ret = ogg_rewrite_tags(map, mapsize, output_fd, (char *)packet.packet,
 203                 packet.bytes);
 204         free(packet.packet);
 205         return ret;
 206 }
 207
 208 static const char * const ogg_suffixes[] = {"ogg", NULL};
 209
 210 /**
 211  * The init function of the ogg vorbis audio format handler.
 212  *
 213  * \param afh Pointer to the struct to initialize.
 214  */
 215 void ogg_init(struct audio_format_handler *afh)
 216 {
 217         afh->get_file_info = ogg_vorbis_get_file_info;
 218         afh->get_header = vorbis_get_header;
 219         afh->suffixes = ogg_suffixes;
 220         afh->rewrite_tags = vorbis_rewrite_tags;
 221 }