mirror of https://github.com/mpv-player/mpv
478 lines
14 KiB
C
478 lines
14 KiB
C
/*
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FILM file parser for the MPlayer program
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by Mike Melanson
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This demuxer handles FILM (a.k.a. CPK) files commonly found on
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Sega Saturn CD-ROM games. FILM files have also been found on 3DO
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games.
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Details of the FILM file format can be found at:
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http://www.pcisys.net/~melanson/codecs/
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "config.h"
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#include "mp_msg.h"
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#include "help_mp.h"
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#include "stream.h"
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#include "demuxer.h"
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#include "stheader.h"
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// chunk types found in a FILM file
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#define CHUNK_FILM mmioFOURCC('F', 'I', 'L', 'M')
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#define CHUNK_FDSC mmioFOURCC('F', 'D', 'S', 'C')
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#define CHUNK_STAB mmioFOURCC('S', 'T', 'A', 'B')
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typedef struct _film_chunk_t
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{
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off_t chunk_offset;
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int chunk_size;
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unsigned int syncinfo1;
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unsigned int syncinfo2;
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float pts;
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} film_chunk_t;
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typedef struct _film_data_t
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{
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unsigned int total_chunks;
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unsigned int current_chunk;
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film_chunk_t *chunks;
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unsigned int chunks_per_second;
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unsigned int film_version;
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} film_data_t;
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static void demux_seek_film(demuxer_t *demuxer, float rel_seek_secs, float audio_delay, int flags)
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{
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film_data_t *film_data = (film_data_t *)demuxer->priv;
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int new_current_chunk=(flags&1)?0:film_data->current_chunk;
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if(flags&2)
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new_current_chunk += rel_seek_secs * film_data->total_chunks; // 0..1
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else
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new_current_chunk += rel_seek_secs * film_data->chunks_per_second; // secs
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mp_msg(MSGT_DECVIDEO, MSGL_INFO,"current, total chunks = %d, %d; seek %5.3f sec, new chunk guess = %d\n",
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film_data->current_chunk, film_data->total_chunks,
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rel_seek_secs, new_current_chunk);
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// check if the new chunk number is valid
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if (new_current_chunk < 0)
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new_current_chunk = 0;
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if ((unsigned int)new_current_chunk > film_data->total_chunks)
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new_current_chunk = film_data->total_chunks - 1;
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while (((film_data->chunks[new_current_chunk].syncinfo1 == 0xFFFFFFFF) ||
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(film_data->chunks[new_current_chunk].syncinfo1 & 0x80000000)) &&
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(new_current_chunk > 0))
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new_current_chunk--;
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film_data->current_chunk = new_current_chunk;
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mp_msg(MSGT_DECVIDEO, MSGL_INFO," (flags = %X) actual new chunk = %d (syncinfo1 = %08X)\n",
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flags, film_data->current_chunk, film_data->chunks[film_data->current_chunk].syncinfo1);
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demuxer->video->pts=film_data->chunks[film_data->current_chunk].pts;
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}
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// return value:
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// 0 = EOF or no stream found
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// 1 = successfully read a packet
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static int demux_film_fill_buffer(demuxer_t *demuxer, demux_stream_t *ds)
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{
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int i;
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unsigned char byte_swap;
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int cvid_size;
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sh_video_t *sh_video = demuxer->video->sh;
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sh_audio_t *sh_audio = demuxer->audio->sh;
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film_data_t *film_data = (film_data_t *)demuxer->priv;
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film_chunk_t film_chunk;
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int length_fix_bytes;
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demux_packet_t* dp;
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// see if the end has been reached
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if (film_data->current_chunk >= film_data->total_chunks)
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return 0;
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film_chunk = film_data->chunks[film_data->current_chunk];
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// position stream and fetch chunk
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stream_seek(demuxer->stream, film_chunk.chunk_offset);
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// load the chunks manually (instead of using ds_read_packet()), since
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// they require some adjustment
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// (all ones in syncinfo1 indicates an audio chunk)
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if (film_chunk.syncinfo1 == 0xFFFFFFFF)
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{
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if(demuxer->audio->id>=-1){ // audio not disabled
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dp = new_demux_packet(film_chunk.chunk_size);
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if (stream_read(demuxer->stream, dp->buffer, film_chunk.chunk_size) !=
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film_chunk.chunk_size)
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return 0;
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dp->pts = film_chunk.pts;
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dp->pos = film_chunk.chunk_offset;
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dp->flags = 0;
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// adjust the data before queuing it:
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// 8-bit: signed -> unsigned
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// 16-bit: big-endian -> little-endian
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if (sh_audio->wf->wBitsPerSample == 8)
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for (i = 0; i < film_chunk.chunk_size; i++)
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dp->buffer[i] += 128;
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else
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for (i = 0; i < film_chunk.chunk_size; i += 2)
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{
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byte_swap = dp->buffer[i];
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dp->buffer[i] = dp->buffer[i + 1];
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dp->buffer[i + 1] = byte_swap;
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}
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/* for SegaSaturn .cpk file, translate audio data if stereo */
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if (sh_audio->wf->nChannels == 2) {
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if (sh_audio->wf->wBitsPerSample == 8) {
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unsigned char* tmp = dp->buffer;
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unsigned char buf[film_chunk.chunk_size];
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for(i = 0; i < film_chunk.chunk_size/2; i++) {
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buf[i*2] = tmp[i];
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buf[i*2+1] = tmp[film_chunk.chunk_size/2+i];
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}
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memcpy( tmp, buf, film_chunk.chunk_size );
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}
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else {/* for 16bit */
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unsigned short* tmp = dp->buffer;
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unsigned short buf[film_chunk.chunk_size/2];
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for(i = 0; i < film_chunk.chunk_size/4; i++) {
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buf[i*2] = tmp[i];
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buf[i*2+1] = tmp[film_chunk.chunk_size/4+i];
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}
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memcpy( tmp, buf, film_chunk.chunk_size );
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}
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}
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// append packet to DS stream
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ds_add_packet(demuxer->audio, dp);
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}
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}
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else
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{
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// if the demuxer is dealing with CVID data, deal with it a special way
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if (sh_video->format == mmioFOURCC('c', 'v', 'i', 'd'))
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{
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if (film_data->film_version)
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length_fix_bytes = 2;
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else
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length_fix_bytes = 6;
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// account for the fix bytes when allocating the buffer
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dp = new_demux_packet(film_chunk.chunk_size - length_fix_bytes);
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// these CVID data chunks have a few extra bytes; skip them
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if (stream_read(demuxer->stream, dp->buffer, 10) != 10)
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return 0;
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stream_skip(demuxer->stream, length_fix_bytes);
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if (stream_read(demuxer->stream, dp->buffer + 10,
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film_chunk.chunk_size - (10 + length_fix_bytes)) !=
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(film_chunk.chunk_size - (10 + length_fix_bytes)))
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return 0;
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dp->pts = film_chunk.pts;
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dp->pos = film_chunk.chunk_offset;
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dp->flags = (film_chunk.syncinfo1 & 0x80000000) ? 1 : 0;
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// fix the CVID chunk size
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cvid_size = film_chunk.chunk_size - length_fix_bytes;
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dp->buffer[1] = (cvid_size >> 16) & 0xFF;
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dp->buffer[2] = (cvid_size >> 8) & 0xFF;
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dp->buffer[3] = (cvid_size >> 0) & 0xFF;
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// append packet to DS stream
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ds_add_packet(demuxer->video, dp);
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}
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else
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{
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ds_read_packet(demuxer->video, demuxer->stream, film_chunk.chunk_size,
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film_chunk.pts,
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film_chunk.chunk_offset, (film_chunk.syncinfo1 & 0x80000000) ? 1 : 0);
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}
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}
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film_data->current_chunk++;
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return 1;
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}
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static demuxer_t* demux_open_film(demuxer_t* demuxer)
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{
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sh_video_t *sh_video = NULL;
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sh_audio_t *sh_audio = NULL;
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film_data_t *film_data;
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film_chunk_t film_chunk;
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int header_size;
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unsigned int chunk_type;
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unsigned int chunk_size;
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unsigned int i;
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unsigned int video_format;
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int audio_channels;
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int counting_chunks;
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unsigned int total_audio_bytes = 0;
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film_data = malloc(sizeof(film_data_t));
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film_data->total_chunks = 0;
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film_data->current_chunk = 0;
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film_data->chunks = NULL;
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film_data->chunks_per_second = 0;
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// go back to the beginning
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stream_reset(demuxer->stream);
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stream_seek(demuxer->stream, 0);
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// read the master chunk type
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chunk_type = stream_read_fourcc(demuxer->stream);
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// validate the chunk type
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if (chunk_type != CHUNK_FILM)
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{
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mp_msg(MSGT_DEMUX, MSGL_ERR, "Not a FILM file\n");
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free(film_data);
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return(NULL);
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}
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// get the header size, which implicitly points past the header and
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// to the start of the data
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header_size = stream_read_dword(demuxer->stream);
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film_data->film_version = stream_read_fourcc(demuxer->stream);
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demuxer->movi_start = header_size;
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demuxer->movi_end = demuxer->stream->end_pos;
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header_size -= 16;
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mp_msg(MSGT_DEMUX, MSGL_HINT, "FILM version %.4s\n",
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(char *)&film_data->film_version);
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// skip to where the next chunk should be
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stream_skip(demuxer->stream, 4);
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// traverse through the header
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while (header_size > 0)
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{
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// fetch the chunk type and size
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chunk_type = stream_read_fourcc(demuxer->stream);
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chunk_size = stream_read_dword(demuxer->stream);
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header_size -= chunk_size;
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switch (chunk_type)
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{
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case CHUNK_FDSC:
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mp_msg(MSGT_DECVIDEO, MSGL_V, "parsing FDSC chunk\n");
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// fetch the video codec fourcc to see if there's any video
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video_format = stream_read_fourcc(demuxer->stream);
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if (video_format)
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{
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// create and initialize the video stream header
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sh_video = new_sh_video(demuxer, 0);
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demuxer->video->sh = sh_video;
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sh_video->ds = demuxer->video;
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sh_video->format = video_format;
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sh_video->disp_h = stream_read_dword(demuxer->stream);
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sh_video->disp_w = stream_read_dword(demuxer->stream);
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mp_msg(MSGT_DECVIDEO, MSGL_V,
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" FILM video: %d x %d\n", sh_video->disp_w,
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sh_video->disp_h);
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}
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else
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// skip height and width if no video
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stream_skip(demuxer->stream, 8);
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if(demuxer->audio->id<-1){
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mp_msg(MSGT_DECVIDEO, MSGL_INFO,"chunk size = 0x%X \n",chunk_size);
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stream_skip(demuxer->stream, chunk_size-12-8);
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break; // audio disabled (or no soundcard)
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}
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// skip over unknown byte, but only if file had non-NULL version
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if (film_data->film_version)
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stream_skip(demuxer->stream, 1);
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// fetch the audio channels to see if there's any audio
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// don't do this if the file is a quirky file with NULL version
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if (film_data->film_version)
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{
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audio_channels = stream_read_char(demuxer->stream);
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if (audio_channels > 0)
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{
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// create and initialize the audio stream header
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sh_audio = new_sh_audio(demuxer, 0);
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demuxer->audio->sh = sh_audio;
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sh_audio->ds = demuxer->audio;
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sh_audio->wf = malloc(sizeof(WAVEFORMATEX));
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// uncompressed PCM format
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sh_audio->wf->wFormatTag = 1;
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sh_audio->format = 1;
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sh_audio->wf->nChannels = audio_channels;
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sh_audio->wf->wBitsPerSample = stream_read_char(demuxer->stream);
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stream_skip(demuxer->stream, 1); // skip unknown byte
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sh_audio->wf->nSamplesPerSec = stream_read_word(demuxer->stream);
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sh_audio->wf->nAvgBytesPerSec =
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sh_audio->wf->nSamplesPerSec * sh_audio->wf->wBitsPerSample
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* sh_audio->wf->nChannels / 8;
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stream_skip(demuxer->stream, 6); // skip the rest of the unknown
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mp_msg(MSGT_DECVIDEO, MSGL_V,
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" FILM audio: %d channels, %d bits, %d Hz\n",
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sh_audio->wf->nChannels, 8 * sh_audio->wf->wBitsPerSample,
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sh_audio->wf->nSamplesPerSec);
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}
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else
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stream_skip(demuxer->stream, 10);
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}
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else
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{
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// otherwise, make some assumptions about the audio
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// create and initialize the audio stream header
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sh_audio = new_sh_audio(demuxer, 0);
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demuxer->audio->sh = sh_audio;
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sh_audio->ds = demuxer->audio;
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sh_audio->wf = malloc(sizeof(WAVEFORMATEX));
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// uncompressed PCM format
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sh_audio->wf->wFormatTag = 1;
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sh_audio->format = 1;
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sh_audio->wf->nChannels = 1;
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sh_audio->wf->wBitsPerSample = 8;
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sh_audio->wf->nSamplesPerSec = 22050;
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sh_audio->wf->nAvgBytesPerSec =
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sh_audio->wf->nSamplesPerSec * sh_audio->wf->wBitsPerSample
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* sh_audio->wf->nChannels / 8;
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mp_msg(MSGT_DECVIDEO, MSGL_V,
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" FILM audio: %d channels, %d bits, %d Hz\n",
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sh_audio->wf->nChannels, sh_audio->wf->wBitsPerSample,
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sh_audio->wf->nSamplesPerSec);
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}
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break;
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case CHUNK_STAB:
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mp_msg(MSGT_DECVIDEO, MSGL_V, "parsing STAB chunk\n");
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if (sh_video)
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{
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sh_video->fps = stream_read_dword(demuxer->stream);
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sh_video->frametime = 1.0 / sh_video->fps;
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}
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// fetch the number of chunks
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film_data->total_chunks = stream_read_dword(demuxer->stream);
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film_data->current_chunk = 0;
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mp_msg(MSGT_DECVIDEO, MSGL_V,
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" STAB chunk contains %d chunks\n", film_data->total_chunks);
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// allocate enough entries for the chunk
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film_data->chunks =
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calloc(film_data->total_chunks, sizeof(film_chunk_t));
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// build the chunk index
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counting_chunks = 1;
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for (i = 0; i < film_data->total_chunks; i++)
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{
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film_chunk = film_data->chunks[i];
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film_chunk.chunk_offset =
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demuxer->movi_start + stream_read_dword(demuxer->stream);
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film_chunk.chunk_size = stream_read_dword(demuxer->stream);
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film_chunk.syncinfo1 = stream_read_dword(demuxer->stream);
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film_chunk.syncinfo2 = stream_read_dword(demuxer->stream);
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// count chunks for the purposes of seeking
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if (counting_chunks)
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{
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// if we're counting chunks, always count an audio chunk
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if (film_chunk.syncinfo1 == 0xFFFFFFFF)
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film_data->chunks_per_second++;
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// if it's a video chunk, check if it's time to stop counting
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else if ((film_chunk.syncinfo1 & 0x7FFFFFFF) >= sh_video->fps)
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counting_chunks = 0;
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else
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film_data->chunks_per_second++;
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}
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// precalculate PTS
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if (film_chunk.syncinfo1 == 0xFFFFFFFF)
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{
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if(demuxer->audio->id>=-1)
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film_chunk.pts =
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(float)total_audio_bytes / (float)sh_audio->wf->nAvgBytesPerSec;
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total_audio_bytes += film_chunk.chunk_size;
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}
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else
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film_chunk.pts =
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(film_chunk.syncinfo1 & 0x7FFFFFFF) / sh_video->fps;
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film_data->chunks[i] = film_chunk;
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}
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// in some FILM files (notably '1.09'), the length of the FDSC chunk
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// follows different rules
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if (chunk_size == (film_data->total_chunks * 16))
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header_size -= 16;
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break;
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default:
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mp_msg(MSGT_DEMUX, MSGL_ERR, "Unrecognized FILM header chunk: %08X\n",
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chunk_type);
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return(NULL);
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break;
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}
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}
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demuxer->priv = film_data;
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return demuxer;
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}
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static void demux_close_film(demuxer_t* demuxer) {
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film_data_t *film_data = demuxer->priv;
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if(!film_data)
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return;
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if(film_data->chunks)
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free(film_data->chunks);
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free(film_data);
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}
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static int film_check_file(demuxer_t* demuxer)
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{
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int signature=stream_read_fourcc(demuxer->stream);
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// check for the FILM file magic number
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if(signature==mmioFOURCC('F', 'I', 'L', 'M'))
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return DEMUXER_TYPE_FILM;
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return 0;
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}
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demuxer_desc_t demuxer_desc_film = {
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"FILM/CPK demuxer for Sega Saturn CD-ROM games",
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"film",
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"FILM",
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"Mike Melanson",
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"",
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DEMUXER_TYPE_FILM,
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0, // unsafe autodetect (short signature)
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film_check_file,
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demux_film_fill_buffer,
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demux_open_film,
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demux_close_film,
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demux_seek_film,
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NULL
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};
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