diff options
author | Tomas Härdin <tomas.hardin@codemill.se> | 2010-04-22 13:04:33 +0400 |
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committer | Tomas Härdin <tomas.hardin@codemill.se> | 2010-04-22 13:04:33 +0400 |
commit | 951776c478c67922a4488132dd68984eedc4e8c8 (patch) | |
tree | c6bda6b8700295e1831034a962edcb5a97818013 /libavformat/flic.c | |
parent | 03cb8458cec01cfbb5c868753d7329ec15449a7c (diff) |
Made FLIC demuxer capable of handling the videos from "X-COM: Terror from the Deep".
Originally committed as revision 22942 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavformat/flic.c')
-rw-r--r-- | libavformat/flic.c | 74 |
1 files changed, 67 insertions, 7 deletions
diff --git a/libavformat/flic.c b/libavformat/flic.c index 011d519c21..27145db086 100644 --- a/libavformat/flic.c +++ b/libavformat/flic.c @@ -27,8 +27,8 @@ * variations, visit: * http://www.compuphase.com/flic.htm * - * This demuxer handles standard 0xAF11- and 0xAF12-type FLIs. It also - * handles special FLIs from the PC game "Magic Carpet". + * This demuxer handles standard 0xAF11- and 0xAF12-type FLIs. It also handles + * special FLIs from the PC games "Magic Carpet" and "X-COM: Terror from the Deep". */ #include "libavutil/intreadwrite.h" @@ -42,12 +42,16 @@ #define FLIC_CHUNK_MAGIC_2 0xF5FA #define FLIC_MC_SPEED 5 /* speed for Magic Carpet game FLIs */ #define FLIC_DEFAULT_SPEED 5 /* for FLIs that have 0 speed */ +#define FLIC_TFTD_CHUNK_AUDIO 0xAAAA /* Audio chunk. Used in Terror from the Deep. + Has 10 B extra header not accounted for in the chunk header */ +#define FLIC_TFTD_SAMPLE_RATE 22050 #define FLIC_HEADER_SIZE 128 #define FLIC_PREAMBLE_SIZE 6 typedef struct FlicDemuxContext { int video_stream_index; + int audio_stream_index; int frame_number; } FlicDemuxContext; @@ -83,9 +87,10 @@ static int flic_read_header(AVFormatContext *s, FlicDemuxContext *flic = s->priv_data; ByteIOContext *pb = s->pb; unsigned char header[FLIC_HEADER_SIZE]; - AVStream *st; + AVStream *st, *ast; int speed; int magic_number; + unsigned char preamble[FLIC_PREAMBLE_SIZE]; flic->frame_number = 0; @@ -123,11 +128,47 @@ static int flic_read_header(AVFormatContext *s, st->codec->extradata = av_malloc(FLIC_HEADER_SIZE); memcpy(st->codec->extradata, header, FLIC_HEADER_SIZE); - /* Time to figure out the framerate: If there is a FLIC chunk magic - * number at offset 0x10, assume this is from the Bullfrog game, - * Magic Carpet. */ - if (AV_RL16(&header[0x10]) == FLIC_CHUNK_MAGIC_1) { + /* peek at the preamble to detect TFTD videos - they seem to always start with an audio chunk */ + if (get_buffer(pb, preamble, FLIC_PREAMBLE_SIZE) != FLIC_PREAMBLE_SIZE) { + av_log(s, AV_LOG_ERROR, "Failed to peek at preamble\n"); + return AVERROR(EIO); + } + url_fseek(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 = av_new_stream(s, 1); + 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 = CODEC_TYPE_AUDIO; + ast->codec->codec_id = CODEC_ID_PCM_U8; + ast->codec->codec_tag = 0; + ast->codec->sample_rate = FLIC_TFTD_SAMPLE_RATE; + ast->codec->channels = 1; + ast->codec->sample_fmt = SAMPLE_FMT_U8; + ast->codec->bit_rate = st->codec->sample_rate * 8; + ast->codec->bits_per_coded_sample = 8; + ast->codec->channel_layout = 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 */ + av_set_pts_info(st, 64, ast->codec->block_align, FLIC_TFTD_SAMPLE_RATE); + av_set_pts_info(ast, 64, 1, FLIC_TFTD_SAMPLE_RATE); + } else if (AV_RL16(&header[0x10]) == FLIC_CHUNK_MAGIC_1) { av_set_pts_info(st, 64, FLIC_MC_SPEED, 70); /* rewind the stream since the first chunk is at offset 12 */ @@ -190,6 +231,25 @@ static int flic_read_packet(AVFormatContext *s, ret = AVERROR(EIO); } packet_read = 1; + } else if (magic == FLIC_TFTD_CHUNK_AUDIO) { + if (av_new_packet(pkt, size)) { + ret = AVERROR(EIO); + break; + } + + /* skip useless 10B sub-header (yes, it's not accounted for in the chunk header) */ + url_fseek(pb, 10, SEEK_CUR); + + pkt->stream_index = flic->audio_stream_index; + pkt->pos = url_ftell(pb); + ret = get_buffer(pb, pkt->data, size); + + if (ret != size) { + av_free_packet(pkt); + ret = AVERROR(EIO); + } + + packet_read = 1; } else { /* not interested in this chunk */ url_fseek(pb, size - 6, SEEK_CUR); |