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630 lines
20 KiB
630 lines
20 KiB
/* |
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* Interplay MVE File Demuxer |
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* Copyright (c) 2003 The ffmpeg Project |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
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/** |
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* @file |
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* Interplay MVE file demuxer |
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* by Mike Melanson (melanson@pcisys.net) |
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* For more information regarding the Interplay MVE file format, visit: |
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* http://www.pcisys.net/~melanson/codecs/ |
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* The aforementioned site also contains a command line utility for parsing |
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* IP MVE files so that you can get a good idea of the typical structure of |
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* such files. This demuxer is not the best example to use if you are trying |
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* to write your own as it uses a rather roundabout approach for splitting |
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* up and sending out the chunks. |
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*/ |
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#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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/* debugging support: #define DEBUG_IPMOVIE as non-zero to see extremely |
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* verbose information about the demux process */ |
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#define DEBUG_IPMOVIE 0 |
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#if DEBUG_IPMOVIE |
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#undef printf |
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#define debug_ipmovie printf |
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#else |
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static inline void debug_ipmovie(const char *format, ...) { } |
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#endif |
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#define CHUNK_PREAMBLE_SIZE 4 |
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#define OPCODE_PREAMBLE_SIZE 4 |
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#define CHUNK_INIT_AUDIO 0x0000 |
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#define CHUNK_AUDIO_ONLY 0x0001 |
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#define CHUNK_INIT_VIDEO 0x0002 |
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#define CHUNK_VIDEO 0x0003 |
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#define CHUNK_SHUTDOWN 0x0004 |
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#define CHUNK_END 0x0005 |
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/* these last types are used internally */ |
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#define CHUNK_DONE 0xFFFC |
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#define CHUNK_NOMEM 0xFFFD |
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#define CHUNK_EOF 0xFFFE |
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#define CHUNK_BAD 0xFFFF |
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#define OPCODE_END_OF_STREAM 0x00 |
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#define OPCODE_END_OF_CHUNK 0x01 |
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#define OPCODE_CREATE_TIMER 0x02 |
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#define OPCODE_INIT_AUDIO_BUFFERS 0x03 |
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#define OPCODE_START_STOP_AUDIO 0x04 |
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#define OPCODE_INIT_VIDEO_BUFFERS 0x05 |
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#define OPCODE_UNKNOWN_06 0x06 |
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#define OPCODE_SEND_BUFFER 0x07 |
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#define OPCODE_AUDIO_FRAME 0x08 |
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#define OPCODE_SILENCE_FRAME 0x09 |
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#define OPCODE_INIT_VIDEO_MODE 0x0A |
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#define OPCODE_CREATE_GRADIENT 0x0B |
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#define OPCODE_SET_PALETTE 0x0C |
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#define OPCODE_SET_PALETTE_COMPRESSED 0x0D |
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#define OPCODE_UNKNOWN_0E 0x0E |
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#define OPCODE_SET_DECODING_MAP 0x0F |
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#define OPCODE_UNKNOWN_10 0x10 |
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#define OPCODE_VIDEO_DATA 0x11 |
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#define OPCODE_UNKNOWN_12 0x12 |
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#define OPCODE_UNKNOWN_13 0x13 |
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#define OPCODE_UNKNOWN_14 0x14 |
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#define OPCODE_UNKNOWN_15 0x15 |
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#define PALETTE_COUNT 256 |
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typedef struct IPMVEContext { |
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unsigned char *buf; |
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int buf_size; |
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uint64_t frame_pts_inc; |
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unsigned int video_bpp; |
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unsigned int video_width; |
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unsigned int video_height; |
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int64_t video_pts; |
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unsigned int audio_bits; |
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unsigned int audio_channels; |
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unsigned int audio_sample_rate; |
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enum CodecID audio_type; |
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unsigned int audio_frame_count; |
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int video_stream_index; |
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int audio_stream_index; |
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int64_t audio_chunk_offset; |
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int audio_chunk_size; |
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int64_t video_chunk_offset; |
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int video_chunk_size; |
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int64_t decode_map_chunk_offset; |
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int decode_map_chunk_size; |
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int64_t next_chunk_offset; |
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AVPaletteControl palette_control; |
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} IPMVEContext; |
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static int load_ipmovie_packet(IPMVEContext *s, AVIOContext *pb, |
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AVPacket *pkt) { |
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int chunk_type; |
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if (s->audio_chunk_offset) { |
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/* adjust for PCM audio by skipping chunk header */ |
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if (s->audio_type != CODEC_ID_INTERPLAY_DPCM) { |
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s->audio_chunk_offset += 6; |
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s->audio_chunk_size -= 6; |
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} |
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avio_seek(pb, s->audio_chunk_offset, SEEK_SET); |
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s->audio_chunk_offset = 0; |
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if (s->audio_chunk_size != av_get_packet(pb, pkt, s->audio_chunk_size)) |
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return CHUNK_EOF; |
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pkt->stream_index = s->audio_stream_index; |
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pkt->pts = s->audio_frame_count; |
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/* audio frame maintenance */ |
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if (s->audio_type != CODEC_ID_INTERPLAY_DPCM) |
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s->audio_frame_count += |
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(s->audio_chunk_size / s->audio_channels / (s->audio_bits / 8)); |
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else |
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s->audio_frame_count += |
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(s->audio_chunk_size - 6) / s->audio_channels; |
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debug_ipmovie("sending audio frame with pts %"PRId64" (%d audio frames)\n", |
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pkt->pts, s->audio_frame_count); |
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chunk_type = CHUNK_VIDEO; |
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} else if (s->decode_map_chunk_offset) { |
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/* send both the decode map and the video data together */ |
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if (av_new_packet(pkt, s->decode_map_chunk_size + s->video_chunk_size)) |
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return CHUNK_NOMEM; |
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pkt->pos= s->decode_map_chunk_offset; |
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avio_seek(pb, s->decode_map_chunk_offset, SEEK_SET); |
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s->decode_map_chunk_offset = 0; |
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if (avio_read(pb, pkt->data, s->decode_map_chunk_size) != |
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s->decode_map_chunk_size) { |
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av_free_packet(pkt); |
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return CHUNK_EOF; |
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} |
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avio_seek(pb, s->video_chunk_offset, SEEK_SET); |
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s->video_chunk_offset = 0; |
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if (avio_read(pb, pkt->data + s->decode_map_chunk_size, |
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s->video_chunk_size) != s->video_chunk_size) { |
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av_free_packet(pkt); |
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return CHUNK_EOF; |
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} |
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pkt->stream_index = s->video_stream_index; |
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pkt->pts = s->video_pts; |
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debug_ipmovie("sending video frame with pts %"PRId64"\n", |
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pkt->pts); |
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s->video_pts += s->frame_pts_inc; |
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chunk_type = CHUNK_VIDEO; |
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} else { |
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avio_seek(pb, s->next_chunk_offset, SEEK_SET); |
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chunk_type = CHUNK_DONE; |
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} |
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return chunk_type; |
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} |
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/* This function loads and processes a single chunk in an IP movie file. |
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* It returns the type of chunk that was processed. */ |
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static int process_ipmovie_chunk(IPMVEContext *s, AVIOContext *pb, |
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AVPacket *pkt) |
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{ |
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unsigned char chunk_preamble[CHUNK_PREAMBLE_SIZE]; |
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int chunk_type; |
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int chunk_size; |
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unsigned char opcode_preamble[OPCODE_PREAMBLE_SIZE]; |
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unsigned char opcode_type; |
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unsigned char opcode_version; |
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int opcode_size; |
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unsigned char scratch[1024]; |
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int i, j; |
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int first_color, last_color; |
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int audio_flags; |
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unsigned char r, g, b; |
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/* see if there are any pending packets */ |
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chunk_type = load_ipmovie_packet(s, pb, pkt); |
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if (chunk_type != CHUNK_DONE) |
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return chunk_type; |
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/* read the next chunk, wherever the file happens to be pointing */ |
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if (pb->eof_reached) |
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return CHUNK_EOF; |
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if (avio_read(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) != |
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CHUNK_PREAMBLE_SIZE) |
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return CHUNK_BAD; |
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chunk_size = AV_RL16(&chunk_preamble[0]); |
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chunk_type = AV_RL16(&chunk_preamble[2]); |
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debug_ipmovie("chunk type 0x%04X, 0x%04X bytes: ", chunk_type, chunk_size); |
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switch (chunk_type) { |
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case CHUNK_INIT_AUDIO: |
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debug_ipmovie("initialize audio\n"); |
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break; |
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case CHUNK_AUDIO_ONLY: |
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debug_ipmovie("audio only\n"); |
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break; |
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case CHUNK_INIT_VIDEO: |
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debug_ipmovie("initialize video\n"); |
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break; |
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case CHUNK_VIDEO: |
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debug_ipmovie("video (and audio)\n"); |
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break; |
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case CHUNK_SHUTDOWN: |
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debug_ipmovie("shutdown\n"); |
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break; |
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case CHUNK_END: |
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debug_ipmovie("end\n"); |
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break; |
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default: |
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debug_ipmovie("invalid chunk\n"); |
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chunk_type = CHUNK_BAD; |
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break; |
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} |
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while ((chunk_size > 0) && (chunk_type != CHUNK_BAD)) { |
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/* read the next chunk, wherever the file happens to be pointing */ |
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if (pb->eof_reached) { |
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chunk_type = CHUNK_EOF; |
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break; |
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} |
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if (avio_read(pb, opcode_preamble, CHUNK_PREAMBLE_SIZE) != |
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CHUNK_PREAMBLE_SIZE) { |
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chunk_type = CHUNK_BAD; |
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break; |
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} |
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opcode_size = AV_RL16(&opcode_preamble[0]); |
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opcode_type = opcode_preamble[2]; |
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opcode_version = opcode_preamble[3]; |
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chunk_size -= OPCODE_PREAMBLE_SIZE; |
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chunk_size -= opcode_size; |
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if (chunk_size < 0) { |
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debug_ipmovie("chunk_size countdown just went negative\n"); |
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chunk_type = CHUNK_BAD; |
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break; |
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} |
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debug_ipmovie(" opcode type %02X, version %d, 0x%04X bytes: ", |
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opcode_type, opcode_version, opcode_size); |
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switch (opcode_type) { |
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case OPCODE_END_OF_STREAM: |
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debug_ipmovie("end of stream\n"); |
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avio_seek(pb, opcode_size, SEEK_CUR); |
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break; |
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case OPCODE_END_OF_CHUNK: |
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debug_ipmovie("end of chunk\n"); |
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avio_seek(pb, opcode_size, SEEK_CUR); |
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break; |
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case OPCODE_CREATE_TIMER: |
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debug_ipmovie("create timer\n"); |
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if ((opcode_version > 0) || (opcode_size > 6)) { |
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debug_ipmovie("bad create_timer opcode\n"); |
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chunk_type = CHUNK_BAD; |
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break; |
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} |
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if (avio_read(pb, scratch, opcode_size) != |
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opcode_size) { |
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chunk_type = CHUNK_BAD; |
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break; |
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} |
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s->frame_pts_inc = ((uint64_t)AV_RL32(&scratch[0])) * AV_RL16(&scratch[4]); |
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debug_ipmovie(" %.2f frames/second (timer div = %d, subdiv = %d)\n", |
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1000000.0/s->frame_pts_inc, AV_RL32(&scratch[0]), AV_RL16(&scratch[4])); |
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break; |
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case OPCODE_INIT_AUDIO_BUFFERS: |
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debug_ipmovie("initialize audio buffers\n"); |
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if ((opcode_version > 1) || (opcode_size > 10)) { |
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debug_ipmovie("bad init_audio_buffers opcode\n"); |
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chunk_type = CHUNK_BAD; |
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break; |
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} |
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if (avio_read(pb, scratch, opcode_size) != |
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opcode_size) { |
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chunk_type = CHUNK_BAD; |
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break; |
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} |
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s->audio_sample_rate = AV_RL16(&scratch[4]); |
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audio_flags = AV_RL16(&scratch[2]); |
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/* bit 0 of the flags: 0 = mono, 1 = stereo */ |
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s->audio_channels = (audio_flags & 1) + 1; |
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/* bit 1 of the flags: 0 = 8 bit, 1 = 16 bit */ |
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s->audio_bits = (((audio_flags >> 1) & 1) + 1) * 8; |
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/* bit 2 indicates compressed audio in version 1 opcode */ |
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if ((opcode_version == 1) && (audio_flags & 0x4)) |
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s->audio_type = CODEC_ID_INTERPLAY_DPCM; |
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else if (s->audio_bits == 16) |
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s->audio_type = CODEC_ID_PCM_S16LE; |
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else |
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s->audio_type = CODEC_ID_PCM_U8; |
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debug_ipmovie("audio: %d bits, %d Hz, %s, %s format\n", |
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s->audio_bits, |
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s->audio_sample_rate, |
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(s->audio_channels == 2) ? "stereo" : "mono", |
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(s->audio_type == CODEC_ID_INTERPLAY_DPCM) ? |
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"Interplay audio" : "PCM"); |
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break; |
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case OPCODE_START_STOP_AUDIO: |
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debug_ipmovie("start/stop audio\n"); |
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avio_seek(pb, opcode_size, SEEK_CUR); |
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break; |
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case OPCODE_INIT_VIDEO_BUFFERS: |
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debug_ipmovie("initialize video buffers\n"); |
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if ((opcode_version > 2) || (opcode_size > 8)) { |
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debug_ipmovie("bad init_video_buffers opcode\n"); |
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chunk_type = CHUNK_BAD; |
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break; |
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} |
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if (avio_read(pb, scratch, opcode_size) != |
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opcode_size) { |
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chunk_type = CHUNK_BAD; |
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break; |
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} |
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s->video_width = AV_RL16(&scratch[0]) * 8; |
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s->video_height = AV_RL16(&scratch[2]) * 8; |
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if (opcode_version < 2 || !AV_RL16(&scratch[6])) { |
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s->video_bpp = 8; |
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} else { |
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s->video_bpp = 16; |
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} |
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debug_ipmovie("video resolution: %d x %d\n", |
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s->video_width, s->video_height); |
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break; |
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case OPCODE_UNKNOWN_06: |
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case OPCODE_UNKNOWN_0E: |
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case OPCODE_UNKNOWN_10: |
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case OPCODE_UNKNOWN_12: |
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case OPCODE_UNKNOWN_13: |
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case OPCODE_UNKNOWN_14: |
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case OPCODE_UNKNOWN_15: |
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debug_ipmovie("unknown (but documented) opcode %02X\n", opcode_type); |
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avio_seek(pb, opcode_size, SEEK_CUR); |
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break; |
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case OPCODE_SEND_BUFFER: |
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debug_ipmovie("send buffer\n"); |
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avio_seek(pb, opcode_size, SEEK_CUR); |
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break; |
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case OPCODE_AUDIO_FRAME: |
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debug_ipmovie("audio frame\n"); |
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/* log position and move on for now */ |
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s->audio_chunk_offset = avio_tell(pb); |
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s->audio_chunk_size = opcode_size; |
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avio_seek(pb, opcode_size, SEEK_CUR); |
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break; |
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case OPCODE_SILENCE_FRAME: |
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debug_ipmovie("silence frame\n"); |
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avio_seek(pb, opcode_size, SEEK_CUR); |
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break; |
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case OPCODE_INIT_VIDEO_MODE: |
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debug_ipmovie("initialize video mode\n"); |
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avio_seek(pb, opcode_size, SEEK_CUR); |
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break; |
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case OPCODE_CREATE_GRADIENT: |
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debug_ipmovie("create gradient\n"); |
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avio_seek(pb, opcode_size, SEEK_CUR); |
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break; |
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case OPCODE_SET_PALETTE: |
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debug_ipmovie("set palette\n"); |
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/* check for the logical maximum palette size |
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* (3 * 256 + 4 bytes) */ |
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if (opcode_size > 0x304) { |
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debug_ipmovie("demux_ipmovie: set_palette opcode too large\n"); |
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chunk_type = CHUNK_BAD; |
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break; |
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} |
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if (avio_read(pb, scratch, opcode_size) != opcode_size) { |
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chunk_type = CHUNK_BAD; |
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break; |
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} |
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/* load the palette into internal data structure */ |
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first_color = AV_RL16(&scratch[0]); |
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last_color = first_color + AV_RL16(&scratch[2]) - 1; |
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/* sanity check (since they are 16 bit values) */ |
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if ((first_color > 0xFF) || (last_color > 0xFF)) { |
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debug_ipmovie("demux_ipmovie: set_palette indexes out of range (%d -> %d)\n", |
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first_color, last_color); |
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chunk_type = CHUNK_BAD; |
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break; |
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} |
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j = 4; /* offset of first palette data */ |
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for (i = first_color; i <= last_color; i++) { |
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/* the palette is stored as a 6-bit VGA palette, thus each |
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* component is shifted up to a 8-bit range */ |
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r = scratch[j++] * 4; |
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g = scratch[j++] * 4; |
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b = scratch[j++] * 4; |
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s->palette_control.palette[i] = (r << 16) | (g << 8) | (b); |
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} |
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/* indicate a palette change */ |
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s->palette_control.palette_changed = 1; |
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break; |
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case OPCODE_SET_PALETTE_COMPRESSED: |
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debug_ipmovie("set palette compressed\n"); |
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avio_seek(pb, opcode_size, SEEK_CUR); |
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break; |
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case OPCODE_SET_DECODING_MAP: |
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debug_ipmovie("set decoding map\n"); |
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/* log position and move on for now */ |
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s->decode_map_chunk_offset = avio_tell(pb); |
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s->decode_map_chunk_size = opcode_size; |
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avio_seek(pb, opcode_size, SEEK_CUR); |
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break; |
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case OPCODE_VIDEO_DATA: |
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debug_ipmovie("set video data\n"); |
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/* log position and move on for now */ |
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s->video_chunk_offset = avio_tell(pb); |
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s->video_chunk_size = opcode_size; |
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avio_seek(pb, opcode_size, SEEK_CUR); |
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break; |
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default: |
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debug_ipmovie("*** unknown opcode type\n"); |
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chunk_type = CHUNK_BAD; |
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break; |
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} |
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} |
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/* make a note of where the stream is sitting */ |
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s->next_chunk_offset = avio_tell(pb); |
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/* dispatch the first of any pending packets */ |
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if ((chunk_type == CHUNK_VIDEO) || (chunk_type == CHUNK_AUDIO_ONLY)) |
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chunk_type = load_ipmovie_packet(s, pb, pkt); |
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return chunk_type; |
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} |
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static const char signature[] = "Interplay MVE File\x1A\0\x1A"; |
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static int ipmovie_probe(AVProbeData *p) |
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{ |
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uint8_t *b = p->buf; |
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uint8_t *b_end = p->buf + p->buf_size - sizeof(signature); |
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do { |
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if (memcmp(b++, signature, sizeof(signature)) == 0) |
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return AVPROBE_SCORE_MAX; |
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} while (b < b_end); |
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return 0; |
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} |
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static int ipmovie_read_header(AVFormatContext *s, |
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AVFormatParameters *ap) |
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{ |
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IPMVEContext *ipmovie = s->priv_data; |
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AVIOContext *pb = s->pb; |
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AVPacket pkt; |
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AVStream *st; |
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unsigned char chunk_preamble[CHUNK_PREAMBLE_SIZE]; |
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int chunk_type; |
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uint8_t signature_buffer[sizeof(signature)]; |
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avio_read(pb, signature_buffer, sizeof(signature_buffer)); |
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while (memcmp(signature_buffer, signature, sizeof(signature))) { |
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memmove(signature_buffer, signature_buffer + 1, sizeof(signature_buffer) - 1); |
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signature_buffer[sizeof(signature_buffer) - 1] = avio_r8(pb); |
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if (pb->eof_reached) |
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return AVERROR_EOF; |
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} |
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/* initialize private context members */ |
|
ipmovie->video_pts = ipmovie->audio_frame_count = 0; |
|
ipmovie->audio_chunk_offset = ipmovie->video_chunk_offset = |
|
ipmovie->decode_map_chunk_offset = 0; |
|
|
|
/* on the first read, this will position the stream at the first chunk */ |
|
ipmovie->next_chunk_offset = avio_tell(pb) + 4; |
|
|
|
/* process the first chunk which should be CHUNK_INIT_VIDEO */ |
|
if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_VIDEO) |
|
return AVERROR_INVALIDDATA; |
|
|
|
/* peek ahead to the next chunk-- if it is an init audio chunk, process |
|
* it; if it is the first video chunk, this is a silent file */ |
|
if (avio_read(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) != |
|
CHUNK_PREAMBLE_SIZE) |
|
return AVERROR(EIO); |
|
chunk_type = AV_RL16(&chunk_preamble[2]); |
|
avio_seek(pb, -CHUNK_PREAMBLE_SIZE, SEEK_CUR); |
|
|
|
if (chunk_type == CHUNK_VIDEO) |
|
ipmovie->audio_type = CODEC_ID_NONE; /* no audio */ |
|
else if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_AUDIO) |
|
return AVERROR_INVALIDDATA; |
|
|
|
/* initialize the stream decoders */ |
|
st = av_new_stream(s, 0); |
|
if (!st) |
|
return AVERROR(ENOMEM); |
|
av_set_pts_info(st, 63, 1, 1000000); |
|
ipmovie->video_stream_index = st->index; |
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
|
st->codec->codec_id = CODEC_ID_INTERPLAY_VIDEO; |
|
st->codec->codec_tag = 0; /* no fourcc */ |
|
st->codec->width = ipmovie->video_width; |
|
st->codec->height = ipmovie->video_height; |
|
st->codec->bits_per_coded_sample = ipmovie->video_bpp; |
|
|
|
/* palette considerations */ |
|
st->codec->palctrl = &ipmovie->palette_control; |
|
|
|
if (ipmovie->audio_type) { |
|
st = av_new_stream(s, 0); |
|
if (!st) |
|
return AVERROR(ENOMEM); |
|
av_set_pts_info(st, 32, 1, ipmovie->audio_sample_rate); |
|
ipmovie->audio_stream_index = st->index; |
|
st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
|
st->codec->codec_id = ipmovie->audio_type; |
|
st->codec->codec_tag = 0; /* no tag */ |
|
st->codec->channels = ipmovie->audio_channels; |
|
st->codec->sample_rate = ipmovie->audio_sample_rate; |
|
st->codec->bits_per_coded_sample = ipmovie->audio_bits; |
|
st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * |
|
st->codec->bits_per_coded_sample; |
|
if (st->codec->codec_id == CODEC_ID_INTERPLAY_DPCM) |
|
st->codec->bit_rate /= 2; |
|
st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int ipmovie_read_packet(AVFormatContext *s, |
|
AVPacket *pkt) |
|
{ |
|
IPMVEContext *ipmovie = s->priv_data; |
|
AVIOContext *pb = s->pb; |
|
int ret; |
|
|
|
ret = process_ipmovie_chunk(ipmovie, pb, pkt); |
|
if (ret == CHUNK_BAD) |
|
ret = AVERROR_INVALIDDATA; |
|
else if (ret == CHUNK_EOF) |
|
ret = AVERROR(EIO); |
|
else if (ret == CHUNK_NOMEM) |
|
ret = AVERROR(ENOMEM); |
|
else if (ret == CHUNK_VIDEO) |
|
ret = 0; |
|
else |
|
ret = -1; |
|
|
|
return ret; |
|
} |
|
|
|
AVInputFormat ff_ipmovie_demuxer = { |
|
"ipmovie", |
|
NULL_IF_CONFIG_SMALL("Interplay MVE format"), |
|
sizeof(IPMVEContext), |
|
ipmovie_probe, |
|
ipmovie_read_header, |
|
ipmovie_read_packet, |
|
};
|
|
|