static int film_read_header(AVFormatContext *s, AVFormatParameters *ap) { FilmDemuxContext *film = s->priv_data; AVIOContext *pb = s->pb; AVStream *st; unsigned char scratch[256]; int i; unsigned int data_offset; unsigned int audio_frame_counter; film->sample_table = NULL; film->stereo_buffer = NULL; film->stereo_buffer_size = 0; /* load the main FILM header */ if (avio_read(pb, scratch, 16) != 16) return AVERROR(EIO); data_offset = AV_RB32(&scratch[4]); film->version = AV_RB32(&scratch[8]); /* load the FDSC chunk */ if (film->version == 0) { /* special case for Lemmings .film files; 20-byte header */ if (avio_read(pb, scratch, 20) != 20) return AVERROR(EIO); /* make some assumptions about the audio parameters */ film->audio_type = CODEC_ID_PCM_S8; film->audio_samplerate = 22050; film->audio_channels = 1; film->audio_bits = 8; } else { /* normal Saturn .cpk files; 32-byte header */ if (avio_read(pb, scratch, 32) != 32) return AVERROR(EIO); film->audio_samplerate = AV_RB16(&scratch[24]); film->audio_channels = scratch[21]; film->audio_bits = scratch[22]; if (scratch[23] == 2) film->audio_type = CODEC_ID_ADPCM_ADX; else if (film->audio_bits == 8) film->audio_type = CODEC_ID_PCM_S8; else if (film->audio_bits == 16) film->audio_type = CODEC_ID_PCM_S16BE; else film->audio_type = CODEC_ID_NONE; } if (AV_RB32(&scratch[0]) != FDSC_TAG) return AVERROR_INVALIDDATA; if (AV_RB32(&scratch[8]) == CVID_TAG) { film->video_type = CODEC_ID_CINEPAK; } else film->video_type = CODEC_ID_NONE; /* initialize the decoder streams */ if (film->video_type) { st = av_new_stream(s, 0); if (!st) return AVERROR(ENOMEM); film->video_stream_index = st->index; st->codec->codec_type = AVMEDIA_TYPE_VIDEO; st->codec->codec_id = film->video_type; st->codec->codec_tag = 0; /* no fourcc */ st->codec->width = AV_RB32(&scratch[16]); st->codec->height = AV_RB32(&scratch[12]); } if (film->audio_type) { st = av_new_stream(s, 0); if (!st) return AVERROR(ENOMEM); film->audio_stream_index = st->index; st->codec->codec_type = AVMEDIA_TYPE_AUDIO; st->codec->codec_id = film->audio_type; st->codec->codec_tag = 1; st->codec->channels = film->audio_channels; st->codec->sample_rate = film->audio_samplerate; if (film->audio_type == CODEC_ID_ADPCM_ADX) { st->codec->bits_per_coded_sample = 18 * 8 / 32; st->codec->block_align = st->codec->channels * 18; } else { st->codec->bits_per_coded_sample = film->audio_bits; st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample / 8; } st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample; } /* load the sample table */ if (avio_read(pb, scratch, 16) != 16) return AVERROR(EIO); if (AV_RB32(&scratch[0]) != STAB_TAG) return AVERROR_INVALIDDATA; film->base_clock = AV_RB32(&scratch[8]); film->sample_count = AV_RB32(&scratch[12]); if(film->sample_count >= UINT_MAX / sizeof(film_sample)) return -1; film->sample_table = av_malloc(film->sample_count * sizeof(film_sample)); if (!film->sample_table) return AVERROR(ENOMEM); for(i=0; i<s->nb_streams; i++) av_set_pts_info(s->streams[i], 33, 1, film->base_clock); audio_frame_counter = 0; for (i = 0; i < film->sample_count; i++) { /* load the next sample record and transfer it to an internal struct */ if (avio_read(pb, scratch, 16) != 16) { av_free(film->sample_table); return AVERROR(EIO); } film->sample_table[i].sample_offset = data_offset + AV_RB32(&scratch[0]); film->sample_table[i].sample_size = AV_RB32(&scratch[4]); if (AV_RB32(&scratch[8]) == 0xFFFFFFFF) { film->sample_table[i].stream = film->audio_stream_index; film->sample_table[i].pts = audio_frame_counter; film->sample_table[i].pts *= film->base_clock; film->sample_table[i].pts /= film->audio_samplerate; if (film->audio_type == CODEC_ID_ADPCM_ADX) audio_frame_counter += (film->sample_table[i].sample_size * 32 / (18 * film->audio_channels)); else audio_frame_counter += (film->sample_table[i].sample_size / (film->audio_channels * film->audio_bits / 8)); } else { film->sample_table[i].stream = film->video_stream_index; film->sample_table[i].pts = AV_RB32(&scratch[8]) & 0x7FFFFFFF; film->sample_table[i].keyframe = (scratch[8] & 0x80) ? 0 : 1; } } film->current_sample = 0; return 0; }