static int flic_read_header(AVFormatContext *s) { FlicDemuxContext *flic = s->priv_data; AVIOContext *pb = s->pb; unsigned char header[FLIC_HEADER_SIZE]; AVStream *st, *ast; int speed; int magic_number; unsigned char preamble[FLIC_PREAMBLE_SIZE]; flic->frame_number = 0; /* load the whole header and pull out the width and height */ if (avio_read(pb, header, FLIC_HEADER_SIZE) != FLIC_HEADER_SIZE) return AVERROR(EIO); magic_number = AV_RL16(&header[4]); speed = AV_RL32(&header[0x10]); if (speed == 0) speed = FLIC_DEFAULT_SPEED; /* initialize the decoder streams */ st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); flic->video_stream_index = st->index; st->codec->codec_type = AVMEDIA_TYPE_VIDEO; st->codec->codec_id = AV_CODEC_ID_FLIC; st->codec->codec_tag = 0; /* no fourcc */ st->codec->width = AV_RL16(&header[0x08]); st->codec->height = AV_RL16(&header[0x0A]); if (!st->codec->width || !st->codec->height) { /* Ugly hack needed for the following sample: */ /* http://samples.mplayerhq.hu/fli-flc/fli-bugs/specular.flc */ av_log(s, AV_LOG_WARNING, "File with no specified width/height. Trying 640x480.\n"); st->codec->width = 640; st->codec->height = 480; } /* send over the whole 128-byte FLIC header */ st->codec->extradata_size = FLIC_HEADER_SIZE; st->codec->extradata = av_malloc(FLIC_HEADER_SIZE); memcpy(st->codec->extradata, header, FLIC_HEADER_SIZE); /* peek at the preamble to detect TFTD videos - they seem to always start with an audio chunk */ if (avio_read(pb, preamble, FLIC_PREAMBLE_SIZE) != FLIC_PREAMBLE_SIZE) { av_log(s, AV_LOG_ERROR, "Failed to peek at preamble\n"); return AVERROR(EIO); } avio_seek(pb, -FLIC_PREAMBLE_SIZE, SEEK_CUR); /* Time to figure out the framerate: * If the first preamble's magic number is 0xAAAA then this file is from * X-COM: Terror from the Deep. If on the other hand there is a FLIC chunk * magic number at offset 0x10 assume this file is from Magic Carpet instead. * If neither of the above is true then this is a normal FLIC file. */ if (AV_RL16(&preamble[4]) == FLIC_TFTD_CHUNK_AUDIO) { /* TFTD videos have an extra 22050 Hz 8-bit mono audio stream */ ast = avformat_new_stream(s, NULL); if (!ast) return AVERROR(ENOMEM); flic->audio_stream_index = ast->index; /* all audio frames are the same size, so use the size of the first chunk for block_align */ ast->codec->block_align = AV_RL32(&preamble[0]); ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; ast->codec->codec_id = AV_CODEC_ID_PCM_U8; ast->codec->codec_tag = 0; ast->codec->sample_rate = FLIC_TFTD_SAMPLE_RATE; ast->codec->channels = 1; ast->codec->bit_rate = st->codec->sample_rate * 8; ast->codec->bits_per_coded_sample = 8; ast->codec->channel_layout = AV_CH_LAYOUT_MONO; ast->codec->extradata_size = 0; /* Since the header information is incorrect we have to figure out the * framerate using block_align and the fact that the audio is 22050 Hz. * We usually have two cases: 2205 -> 10 fps and 1470 -> 15 fps */ avpriv_set_pts_info(st, 64, ast->codec->block_align, FLIC_TFTD_SAMPLE_RATE); avpriv_set_pts_info(ast, 64, 1, FLIC_TFTD_SAMPLE_RATE); } else if (AV_RL16(&header[0x10]) == FLIC_CHUNK_MAGIC_1) { avpriv_set_pts_info(st, 64, FLIC_MC_SPEED, 70); /* rewind the stream since the first chunk is at offset 12 */ avio_seek(pb, 12, SEEK_SET); /* send over abbreviated FLIC header chunk */ av_free(st->codec->extradata); st->codec->extradata_size = 12; st->codec->extradata = av_malloc(12); memcpy(st->codec->extradata, header, 12); } else if (magic_number == FLIC_FILE_MAGIC_1) { avpriv_set_pts_info(st, 64, speed, 70); } else if ((magic_number == FLIC_FILE_MAGIC_2) || (magic_number == FLIC_FILE_MAGIC_3)) { avpriv_set_pts_info(st, 64, speed, 1000); } else { av_log(s, AV_LOG_ERROR, "Invalid or unsupported magic chunk in file\n"); return AVERROR_INVALIDDATA; } return 0; }