ogg_afh.c

   1 /* Copyright (C) 2004 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
   2
   3 /** \file ogg_afh.c Audio format handler for ogg/vorbis files. */
   4
   5 #include <vorbis/codec.h>
   6 #include <regex.h>
   7
   8 #include "para.h"
   9 #include "afh.h"
  10 #include "error.h"
  11 #include "string.h"
  12 #include "ogg_afh_common.h"
  13
  14 struct private_vorbis_data {
  15         vorbis_info vi;
  16         vorbis_comment vc;
  17 };
  18
  19 /*
  20  * Vorbis uses three header packets, all of which are required: the
  21  * identification header, the comments header, and the setup header.
  22  *
  23  * The identification header identifies the bitstream as Vorbis. It contains
  24  * the Vorbis version and simple audio characteristics of the stream such as
  25  * sample rate and number of channels.
  26  *
  27  * The comment header includes user text comments (tags) and a vendor string
  28  * for the application/library that produced the bitstream.
  29  *
  30  * The setup header includes extensive CODEC setup information as well as the
  31  * complete VQ and Huffman codebooks needed for decoding.
  32  */
  33 static int vorbis_packet_callback(ogg_packet *packet, int packet_num,
  34                 __a_unused int serial, struct afh_info *afhi, void *private_data)
  35 {
  36         struct private_vorbis_data *pvd = private_data;
  37
  38         if (vorbis_synthesis_headerin(&pvd->vi, &pvd->vc, packet) < 0)
  39                 return -E_VORBIS;
  40         if (packet_num == 0) {
  41                 if (pvd->vi.rate == 0)
  42                         return -E_VORBIS;
  43                 afhi->channels = pvd->vi.channels;
  44                 afhi->frequency = pvd->vi.rate;
  45                 afhi->bitrate = pvd->vi.bitrate_nominal / 1000;
  46                 PARA_DEBUG_LOG("channels: %i, sampling rate: %i, bitrate: %i\n",
  47                         afhi->channels, afhi->frequency, afhi->bitrate);
  48                 return 1;
  49         }
  50         if (packet_num == 1)
  51                 return 1; /* we also want to have packet #2 */
  52         afhi->tags.artist = para_strdup(vorbis_comment_query(&pvd->vc, "artist", 0));
  53         afhi->tags.title = para_strdup(vorbis_comment_query(&pvd->vc, "title", 0));
  54         afhi->tags.album = para_strdup(vorbis_comment_query(&pvd->vc, "album", 0));
  55         afhi->tags.year = para_strdup(vorbis_comment_query(&pvd->vc, "year", 0));
  56         afhi->tags.comment = para_strdup(vorbis_comment_query(&pvd->vc, "comment", 0));
  57         return 0;
  58 }
  59
  60 static int ogg_vorbis_get_file_info(char *map, size_t numbytes, __a_unused int fd,
  61                 struct afh_info *afhi)
  62 {
  63         int ret;
  64         struct private_vorbis_data pvd;
  65         struct oac_callback_info vorbis_callback_info = {
  66                 .packet_callback = vorbis_packet_callback,
  67                 .private_data = &pvd,
  68         };
  69
  70         vorbis_info_init(&pvd.vi);
  71         vorbis_comment_init(&pvd.vc);
  72         ret = oac_get_file_info(map, numbytes, afhi, &vorbis_callback_info);
  73         vorbis_info_clear(&pvd.vi);
  74         vorbis_comment_clear(&pvd.vc);
  75         return ret;
  76 }
  77
  78 static int vorbis_get_header_callback(ogg_packet *packet, int packet_num,
  79                 int serial, __a_unused struct afh_info *afhi, void *private_data)
  80 {
  81         int ret;
  82         struct oac_custom_header *h = private_data;
  83         static unsigned char dummy_packet[] = {
  84                 0x03,
  85                 'v', 'o', 'r', 'b', 'i', 's',
  86                 0x06, 0x00, 0x00, 0x00,
  87                 'd', 'u', 'm', 'm', 'y', '\0',
  88                 0x00, 0x00, 0x00, 0x00, /* no comment :) */
  89                 0xff /* framing bit */
  90         };
  91
  92         PARA_DEBUG_LOG("processing ogg packet #%d\n", packet_num);
  93         if (packet_num == 0) {
  94                 oac_custom_header_init(serial, h);
  95                 ret = oac_custom_header_append(packet, h);
  96                 if (ret < 0)
  97                         return ret;
  98                 oac_custom_header_flush(h);
  99                 return 1;
 100         }
 101         if (packet_num == 1) {
 102                 ogg_packet replacement = *packet;
 103                 PARA_INFO_LOG("replacing metadata packet\n");
 104                 replacement.packet = dummy_packet;
 105                 replacement.bytes = sizeof(dummy_packet);
 106                 ret = oac_custom_header_append(&replacement, h);
 107                 return ret < 0? ret : 1;
 108         }
 109         assert(packet_num == 2);
 110         ret = oac_custom_header_append(packet, h);
 111         if (ret < 0)
 112                 return ret;
 113         oac_custom_header_flush(h);
 114         return 0;
 115 }
 116
 117 static void vorbis_get_header(void *map, size_t mapsize, char **buf,
 118                 size_t *len)
 119 {
 120         int ret;
 121         struct oac_custom_header *h = oac_custom_header_new();
 122         struct oac_callback_info cb = {
 123                 .packet_callback = vorbis_get_header_callback,
 124                 .private_data = h,
 125         };
 126
 127         ret = oac_get_file_info(map, mapsize, NULL, &cb);
 128         *len = oac_custom_header_get(buf, h);
 129         if (ret < 0) {
 130                 PARA_ERROR_LOG("could not create ogg/vorbis header: %s\n",
 131                         para_strerror(-ret));
 132                 free(*buf);
 133                 *buf = NULL;
 134                 *len = 0;
 135         } else
 136                 PARA_INFO_LOG("created %zu byte ogg vorbis header\n", *len);
 137 }
 138
 139 static int vorbis_make_meta_packet(struct taginfo *tags, ogg_packet *result)
 140 {
 141         vorbis_comment vc;
 142         int ret;
 143
 144         vorbis_comment_init(&vc);
 145         vorbis_comment_add_tag(&vc, "artist", tags->artist);
 146         vorbis_comment_add_tag(&vc, "title", tags->title);
 147         vorbis_comment_add_tag(&vc, "album", tags->album);
 148         vorbis_comment_add_tag(&vc, "year", tags->year);
 149         vorbis_comment_add_tag(&vc, "comment", tags->comment);
 150         ret = vorbis_commentheader_out(&vc, result);
 151         vorbis_comment_clear(&vc);
 152         if (ret != 0)
 153                 return -E_VORBIS_COMMENTHEADER;
 154         return 1;
 155 }
 156
 157 static int vorbis_rewrite_tags(const char *map, size_t mapsize,
 158                 struct taginfo *tags, int output_fd,
 159                 __a_unused const char *filename)
 160 {
 161         int ret;
 162         ogg_packet packet;
 163
 164         ret = vorbis_make_meta_packet(tags, &packet);
 165         if (ret < 0)
 166                 return ret;
 167         ret = oac_rewrite_tags(map, mapsize, output_fd, (char *)packet.packet,
 168                 packet.bytes);
 169         free(packet.packet);
 170         return ret;
 171 }
 172
 173 static const char * const ogg_suffixes[] = {"ogg", NULL};
 174
 175 /**
 176  * The init function of the ogg vorbis audio format handler.
 177  *
 178  * \param afh Pointer to the struct to initialize.
 179  */
 180 void ogg_afh_init(struct audio_format_handler *afh)
 181 {
 182         afh->get_file_info = ogg_vorbis_get_file_info;
 183         afh->get_header = vorbis_get_header;
 184         afh->suffixes = ogg_suffixes;
 185         afh->rewrite_tags = vorbis_rewrite_tags;
 186 }