static int rpl_read_header(AVFormatContext *s, AVFormatParameters *ap) { AVIOContext *pb = s->pb; RPLContext *rpl = s->priv_data; AVStream *vst = NULL, *ast = NULL; int total_audio_size; int error = 0; uint32_t i; int32_t audio_format, chunk_catalog_offset, number_of_chunks; AVRational fps; char line[RPL_LINE_LENGTH]; // The header for RPL/ARMovie files is 21 lines of text // containing the various header fields. The fields are always // in the same order, and other text besides the first // number usually isn't important. // (The spec says that there exists some significance // for the text in a few cases; samples needed.) error |= read_line(pb, line, sizeof(line)); // ARMovie error |= read_line(pb, line, sizeof(line)); // movie name av_dict_set(&s->metadata, "title" , line, 0); error |= read_line(pb, line, sizeof(line)); // date/copyright av_dict_set(&s->metadata, "copyright", line, 0); error |= read_line(pb, line, sizeof(line)); // author and other av_dict_set(&s->metadata, "author" , line, 0); // video headers vst = avformat_new_stream(s, NULL); if (!vst) return AVERROR(ENOMEM); vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; vst->codec->codec_tag = read_line_and_int(pb, &error); // video format vst->codec->width = read_line_and_int(pb, &error); // video width vst->codec->height = read_line_and_int(pb, &error); // video height vst->codec->bits_per_coded_sample = read_line_and_int(pb, &error); // video bits per sample error |= read_line(pb, line, sizeof(line)); // video frames per second fps = read_fps(line, &error); avpriv_set_pts_info(vst, 32, fps.den, fps.num); // Figure out the video codec switch (vst->codec->codec_tag) { #if 0 case 122: vst->codec->codec_id = CODEC_ID_ESCAPE122; break; #endif case 124: vst->codec->codec_id = CODEC_ID_ESCAPE124; // The header is wrong here, at least sometimes vst->codec->bits_per_coded_sample = 16; break; case 130: vst->codec->codec_id = CODEC_ID_ESCAPE130; break; default: av_log(s, AV_LOG_WARNING, "RPL video format %i not supported yet!\n", vst->codec->codec_tag); vst->codec->codec_id = CODEC_ID_NONE; } // Audio headers // ARMovie supports multiple audio tracks; I don't have any // samples, though. This code will ignore additional tracks. audio_format = read_line_and_int(pb, &error); // audio format ID if (audio_format) { ast = avformat_new_stream(s, NULL); if (!ast) return AVERROR(ENOMEM); ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; ast->codec->codec_tag = audio_format; ast->codec->sample_rate = read_line_and_int(pb, &error); // audio bitrate ast->codec->channels = read_line_and_int(pb, &error); // number of audio channels ast->codec->bits_per_coded_sample = read_line_and_int(pb, &error); // audio bits per sample // At least one sample uses 0 for ADPCM, which is really 4 bits // per sample. if (ast->codec->bits_per_coded_sample == 0) ast->codec->bits_per_coded_sample = 4; ast->codec->bit_rate = ast->codec->sample_rate * ast->codec->bits_per_coded_sample * ast->codec->channels; ast->codec->codec_id = CODEC_ID_NONE; switch (audio_format) { case 1: if (ast->codec->bits_per_coded_sample == 16) { // 16-bit audio is always signed ast->codec->codec_id = CODEC_ID_PCM_S16LE; break; } // There are some other formats listed as legal per the spec; // samples needed. break; case 101: if (ast->codec->bits_per_coded_sample == 8) { // The samples with this kind of audio that I have // are all unsigned. ast->codec->codec_id = CODEC_ID_PCM_U8; break; } else if (ast->codec->bits_per_coded_sample == 4) { ast->codec->codec_id = CODEC_ID_ADPCM_IMA_EA_SEAD; break; } break; } if (ast->codec->codec_id == CODEC_ID_NONE) { av_log(s, AV_LOG_WARNING, "RPL audio format %i not supported yet!\n", audio_format); } avpriv_set_pts_info(ast, 32, 1, ast->codec->bit_rate); } else { for (i = 0; i < 3; i++) error |= read_line(pb, line, sizeof(line)); } rpl->frames_per_chunk = read_line_and_int(pb, &error); // video frames per chunk if (rpl->frames_per_chunk > 1 && vst->codec->codec_tag != 124) av_log(s, AV_LOG_WARNING, "Don't know how to split frames for video format %i. " "Video stream will be broken!\n", vst->codec->codec_tag); number_of_chunks = read_line_and_int(pb, &error); // number of chunks in the file // The number in the header is actually the index of the last chunk. number_of_chunks++; error |= read_line(pb, line, sizeof(line)); // "even" chunk size in bytes error |= read_line(pb, line, sizeof(line)); // "odd" chunk size in bytes chunk_catalog_offset = // offset of the "chunk catalog" read_line_and_int(pb, &error); // (file index) error |= read_line(pb, line, sizeof(line)); // offset to "helpful" sprite error |= read_line(pb, line, sizeof(line)); // size of "helpful" sprite error |= read_line(pb, line, sizeof(line)); // offset to key frame list // Read the index avio_seek(pb, chunk_catalog_offset, SEEK_SET); total_audio_size = 0; for (i = 0; i < number_of_chunks; i++) { int64_t offset, video_size, audio_size; error |= read_line(pb, line, sizeof(line)); if (3 != sscanf(line, "%"PRId64" , %"PRId64" ; %"PRId64, &offset, &video_size, &audio_size)) error = -1; av_add_index_entry(vst, offset, i * rpl->frames_per_chunk, video_size, rpl->frames_per_chunk, 0); if (ast) av_add_index_entry(ast, offset + video_size, total_audio_size, audio_size, audio_size * 8, 0); total_audio_size += audio_size * 8; } if (error) return AVERROR(EIO); return 0; }