libavformat/rpl.c

   1 /*
   2  * ARMovie/RPL demuxer
   3  * Copyright (c) 2007 Christian Ohm, 2008 Eli Friedman
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "libavutil/avstring.h"
  23 #include "avformat.h"
  24 #include <stdlib.h>
  25
  26 #define RPL_SIGNATURE "ARMovie\x0A"
  27 #define RPL_SIGNATURE_SIZE 8
  28
  29 /** 256 is arbitrary, but should be big enough for any reasonable file. */
  30 #define RPL_LINE_LENGTH 256
  31
  32 static int rpl_probe(AVProbeData *p)
  33 {
  34     if (memcmp(p->buf, RPL_SIGNATURE, RPL_SIGNATURE_SIZE))
  35         return 0;
  36
  37     return AVPROBE_SCORE_MAX;
  38 }
  39
  40 typedef struct RPLContext {
  41     // RPL header data
  42     int32_t frames_per_chunk;
  43
  44     // Stream position data
  45     uint32_t chunk_number;
  46     uint32_t chunk_part;
  47     uint32_t frame_in_part;
  48 } RPLContext;
  49
  50 static int read_line(ByteIOContext * pb, char* line, int bufsize)
  51 {
  52     int i;
  53     for (i = 0; i < bufsize - 1; i++) {
  54         int b = get_byte(pb);
  55         if (b == 0)
  56             break;
  57         if (b == '\n') {
  58             line[i] = '\0';
  59             return 0;
  60         }
  61         line[i] = b;
  62     }
  63     line[i] = '\0';
  64     return -1;
  65 }
  66
  67 static int32_t read_int(const char* line, const char** endptr, int* error)
  68 {
  69     unsigned long result = 0;
  70     for (; *line>='0' && *line<='9'; line++) {
  71         if (result > (0x7FFFFFFF - 9) / 10)
  72             *error = -1;
  73         result = 10 * result + *line - '0';
  74     }
  75     *endptr = line;
  76     return result;
  77 }
  78
  79 static int32_t read_line_and_int(ByteIOContext * pb, int* error)
  80 {
  81     char line[RPL_LINE_LENGTH];
  82     const char *endptr;
  83     *error |= read_line(pb, line, sizeof(line));
  84     return read_int(line, &endptr, error);
  85 }
  86
  87 /** Parsing for fps, which can be a fraction. Unfortunately,
  88   * the spec for the header leaves out a lot of details,
  89   * so this is mostly guessing.
  90   */
  91 static AVRational read_fps(const char* line, int* error)
  92 {
  93     int64_t num, den = 1;
  94     AVRational result;
  95     num = read_int(line, &line, error);
  96     if (*line == '.')
  97         line++;
  98     for (; *line>='0' && *line<='9'; line++) {
  99         // Truncate any numerator too large to fit into an int64_t
 100         if (num > (INT64_MAX - 9) / 10 || den > INT64_MAX / 10)
 101             break;
 102         num  = 10 * num + *line - '0';
 103         den *= 10;
 104     }
 105     if (!num)
 106         *error = -1;
 107     av_reduce(&result.num, &result.den, num, den, 0x7FFFFFFF);
 108     return result;
 109 }
 110
 111 static int rpl_read_header(AVFormatContext *s, AVFormatParameters *ap)
 112 {
 113     ByteIOContext *pb = s->pb;
 114     RPLContext *rpl = s->priv_data;
 115     AVStream *vst = NULL, *ast = NULL;
 116     int total_audio_size;
 117     int error = 0;
 118
 119     uint32_t i;
 120
 121     int32_t audio_format, chunk_catalog_offset, number_of_chunks;
 122     AVRational fps;
 123
 124     char line[RPL_LINE_LENGTH];
 125
 126     // The header for RPL/ARMovie files is 21 lines of text
 127     // containing the various header fields.  The fields are always
 128     // in the same order, and other text besides the first
 129     // number usually isn't important.
 130     // (The spec says that there exists some significance
 131     // for the text in a few cases; samples needed.)
 132     error |= read_line(pb, line, sizeof(line));      // ARMovie
 133     error |= read_line(pb, line, sizeof(line));      // movie name
 134     av_metadata_set(&s->metadata, "title"    , line);
 135     error |= read_line(pb, line, sizeof(line));      // date/copyright
 136     av_metadata_set(&s->metadata, "copyright", line);
 137     error |= read_line(pb, line, sizeof(line));      // author and other
 138     av_metadata_set(&s->metadata, "author"   , line);
 139
 140     // video headers
 141     vst = av_new_stream(s, 0);
 142     if (!vst)
 143         return AVERROR(ENOMEM);
 144     vst->codec->codec_type      = CODEC_TYPE_VIDEO;
 145     vst->codec->codec_tag       = read_line_and_int(pb, &error);  // video format
 146     vst->codec->width           = read_line_and_int(pb, &error);  // video width
 147     vst->codec->height          = read_line_and_int(pb, &error);  // video height
 148     vst->codec->bits_per_coded_sample = read_line_and_int(pb, &error);  // video bits per sample
 149     error |= read_line(pb, line, sizeof(line));                   // video frames per second
 150     fps = read_fps(line, &error);
 151     av_set_pts_info(vst, 32, fps.den, fps.num);
 152
 153     // Figure out the video codec
 154     switch (vst->codec->codec_tag) {
 155 #if 0
 156         case 122:
 157             vst->codec->codec_id = CODEC_ID_ESCAPE122;
 158             break;
 159 #endif
 160         case 124:
 161             vst->codec->codec_id = CODEC_ID_ESCAPE124;
 162             // The header is wrong here, at least sometimes
 163             vst->codec->bits_per_coded_sample = 16;
 164             break;
 165 #if 0
 166         case 130:
 167             vst->codec->codec_id = CODEC_ID_ESCAPE130;
 168             break;
 169 #endif
 170         default:
 171             av_log(s, AV_LOG_WARNING,
 172                    "RPL video format %i not supported yet!\n",
 173                    vst->codec->codec_tag);
 174             vst->codec->codec_id = CODEC_ID_NONE;
 175     }
 176
 177     // Audio headers
 178
 179     // ARMovie supports multiple audio tracks; I don't have any
 180     // samples, though. This code will ignore additional tracks.
 181     audio_format = read_line_and_int(pb, &error);  // audio format ID
 182     if (audio_format) {
 183         ast = av_new_stream(s, 0);
 184         if (!ast)
 185             return AVERROR(ENOMEM);
 186         ast->codec->codec_type      = CODEC_TYPE_AUDIO;
 187         ast->codec->codec_tag       = audio_format;
 188         ast->codec->sample_rate     = read_line_and_int(pb, &error);  // audio bitrate
 189         ast->codec->channels        = read_line_and_int(pb, &error);  // number of audio channels
 190         ast->codec->bits_per_coded_sample = read_line_and_int(pb, &error);  // audio bits per sample
 191         // At least one sample uses 0 for ADPCM, which is really 4 bits
 192         // per sample.
 193         if (ast->codec->bits_per_coded_sample == 0)
 194             ast->codec->bits_per_coded_sample = 4;
 195
 196         ast->codec->bit_rate = ast->codec->sample_rate *
 197                                ast->codec->bits_per_coded_sample *
 198                                ast->codec->channels;
 199
 200         ast->codec->codec_id = CODEC_ID_NONE;
 201         switch (audio_format) {
 202             case 1:
 203                 if (ast->codec->bits_per_coded_sample == 16) {
 204                     // 16-bit audio is always signed
 205                     ast->codec->codec_id = CODEC_ID_PCM_S16LE;
 206                     break;
 207                 }
 208                 // There are some other formats listed as legal per the spec;
 209                 // samples needed.
 210                 break;
 211             case 101:
 212                 if (ast->codec->bits_per_coded_sample == 8) {
 213                     // The samples with this kind of audio that I have
 214                     // are all unsigned.
 215                     ast->codec->codec_id = CODEC_ID_PCM_U8;
 216                     break;
 217                 } else if (ast->codec->bits_per_coded_sample == 4) {
 218                     ast->codec->codec_id = CODEC_ID_ADPCM_IMA_EA_SEAD;
 219                     break;
 220                 }
 221                 break;
 222         }
 223         if (ast->codec->codec_id == CODEC_ID_NONE) {
 224             av_log(s, AV_LOG_WARNING,
 225                    "RPL audio format %i not supported yet!\n",
 226                    audio_format);
 227         }
 228         av_set_pts_info(ast, 32, 1, ast->codec->bit_rate);
 229     } else {
 230         for (i = 0; i < 3; i++)
 231             error |= read_line(pb, line, sizeof(line));
 232     }
 233
 234     rpl->frames_per_chunk = read_line_and_int(pb, &error);  // video frames per chunk
 235     if (rpl->frames_per_chunk > 1 && vst->codec->codec_tag != 124)
 236         av_log(s, AV_LOG_WARNING,
 237                "Don't know how to split frames for video format %i. "
 238                "Video stream will be broken!\n", vst->codec->codec_tag);
 239
 240     number_of_chunks = read_line_and_int(pb, &error);  // number of chunks in the file
 241     // The number in the header is actually the index of the last chunk.
 242     number_of_chunks++;
 243
 244     error |= read_line(pb, line, sizeof(line));  // "even" chunk size in bytes
 245     error |= read_line(pb, line, sizeof(line));  // "odd" chunk size in bytes
 246     chunk_catalog_offset =                       // offset of the "chunk catalog"
 247         read_line_and_int(pb, &error);           //   (file index)
 248     error |= read_line(pb, line, sizeof(line));  // offset to "helpful" sprite
 249     error |= read_line(pb, line, sizeof(line));  // size of "helpful" sprite
 250     error |= read_line(pb, line, sizeof(line));  // offset to key frame list
 251
 252     // Read the index
 253     url_fseek(pb, chunk_catalog_offset, SEEK_SET);
 254     total_audio_size = 0;
 255     for (i = 0; i < number_of_chunks; i++) {
 256         int64_t offset, video_size, audio_size;
 257         error |= read_line(pb, line, sizeof(line));
 258         if (3 != sscanf(line, "%"PRId64" , %"PRId64" ; %"PRId64,
 259                         &offset, &video_size, &audio_size))
 260             error = -1;
 261         av_add_index_entry(vst, offset, i * rpl->frames_per_chunk,
 262                            video_size, rpl->frames_per_chunk, 0);
 263         if (ast)
 264             av_add_index_entry(ast, offset + video_size, total_audio_size,
 265                                audio_size, audio_size * 8, 0);
 266         total_audio_size += audio_size * 8;
 267     }
 268
 269     if (error) return AVERROR(EIO);
 270
 271     return 0;
 272 }
 273
 274 static int rpl_read_packet(AVFormatContext *s, AVPacket *pkt)
 275 {
 276     RPLContext *rpl = s->priv_data;
 277     ByteIOContext *pb = s->pb;
 278     AVStream* stream;
 279     AVIndexEntry* index_entry;
 280     uint32_t ret;
 281
 282     if (rpl->chunk_part == s->nb_streams) {
 283         rpl->chunk_number++;
 284         rpl->chunk_part = 0;
 285     }
 286
 287     stream = s->streams[rpl->chunk_part];
 288
 289     if (rpl->chunk_number >= stream->nb_index_entries)
 290         return -1;
 291
 292     index_entry = &stream->index_entries[rpl->chunk_number];
 293
 294     if (rpl->frame_in_part == 0)
 295         if (url_fseek(pb, index_entry->pos, SEEK_SET) < 0)
 296             return AVERROR(EIO);
 297
 298     if (stream->codec->codec_type == CODEC_TYPE_VIDEO &&
 299         stream->codec->codec_tag == 124) {
 300         // We have to split Escape 124 frames because there are
 301         // multiple frames per chunk in Escape 124 samples.
 302         uint32_t frame_size, frame_flags;
 303
 304         frame_flags = get_le32(pb);
 305         frame_size = get_le32(pb);
 306         if (url_fseek(pb, -8, SEEK_CUR) < 0)
 307             return AVERROR(EIO);
 308
 309         ret = av_get_packet(pb, pkt, frame_size);
 310         if (ret != frame_size) {
 311             av_free_packet(pkt);
 312             return AVERROR(EIO);
 313         }
 314         pkt->duration = 1;
 315         pkt->pts = index_entry->timestamp + rpl->frame_in_part;
 316         pkt->stream_index = rpl->chunk_part;
 317
 318         rpl->frame_in_part++;
 319         if (rpl->frame_in_part == rpl->frames_per_chunk) {
 320             rpl->frame_in_part = 0;
 321             rpl->chunk_part++;
 322         }
 323     } else {
 324         ret = av_get_packet(pb, pkt, index_entry->size);
 325         if (ret != index_entry->size) {
 326             av_free_packet(pkt);
 327             return AVERROR(EIO);
 328         }
 329
 330         if (stream->codec->codec_type == CODEC_TYPE_VIDEO) {
 331             // frames_per_chunk should always be one here; the header
 332             // parsing will warn if it isn't.
 333             pkt->duration = rpl->frames_per_chunk;
 334         } else {
 335             // All the audio codecs supported in this container
 336             // (at least so far) are constant-bitrate.
 337             pkt->duration = ret * 8;
 338         }
 339         pkt->pts = index_entry->timestamp;
 340         pkt->stream_index = rpl->chunk_part;
 341         rpl->chunk_part++;
 342     }
 343
 344     // None of the Escape formats have keyframes, and the ADPCM
 345     // format used doesn't have keyframes.
 346     if (rpl->chunk_number == 0 && rpl->frame_in_part == 0)
 347         pkt->flags |= PKT_FLAG_KEY;
 348
 349     return ret;
 350 }
 351
 352 AVInputFormat rpl_demuxer = {
 353     "rpl",
 354     NULL_IF_CONFIG_SMALL("RPL/ARMovie format"),
 355     sizeof(RPLContext),
 356     rpl_probe,
 357     rpl_read_header,
 358     rpl_read_packet,
 359 };