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/*
FILM file parser for the MPlayer program
by Mike Melanson
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "config.h"
#include "mp_msg.h"
#include "help_mp.h"
#include "stream.h"
#include "demuxer.h"
#include "stheader.h"
// chunk types found in a FILM file
#define CHUNK_FILM mmioFOURCC('F', 'I', 'L', 'M')
#define CHUNK_FDSC mmioFOURCC('F', 'D', 'S', 'C')
#define CHUNK_STAB mmioFOURCC('S', 'T', 'A', 'B')
typedef struct _film_chunk_t
{
off_t chunk_offset;
int chunk_size;
unsigned int flags1;
unsigned int flags2;
unsigned int video_chunk_number; // in the case of a video chunk
unsigned int running_audio_sample_count; // for an audio chunk
} film_chunk_t;
typedef struct _film_data_t
{
int total_chunks;
int current_chunk;
int total_video_chunks;
int total_audio_sample_count;
film_chunk_t *chunks;
} film_data_t;
#if 0
void demux_seek_film(demuxer_t *demuxer,float rel_seek_secs,int flags)
{
film_frames_t *frames = (film_frames_t *)demuxer->priv;
sh_video_t *sh_video = demuxer->video->sh;
int newpos=(flags&1)?0:frames->current_frame;
if(flags&2){
// float 0..1
newpos+=rel_seek_secs*frames->num_frames;
} else {
// secs
newpos+=rel_seek_secs*sh_video->fps;
}
if(newpos<0) newpos=0; else
if(newpos>frames->num_frames) newpos=frames->num_frames;
frames->current_frame=newpos;
}
#endif
// return value:
// 0 = EOF or no stream found
// 1 = successfully read a packet
int demux_film_fill_buffer(demuxer_t *demuxer)
{
sh_video_t *sh_video = demuxer->video->sh;
film_data_t *film_data = (film_data_t *)demuxer->priv;
film_chunk_t film_chunk;
// see if the end has been reached
if (film_data->current_chunk >= film_data->total_chunks)
return 0;
film_chunk = film_data->chunks[film_data->current_chunk];
// position stream and fetch chunk
stream_seek(demuxer->stream, film_chunk.chunk_offset);
if (film_chunk.flags1 == 0xFFFFFFFF)
ds_read_packet(demuxer->audio, demuxer->stream, film_chunk.chunk_size,
0, /* pts */
film_chunk.chunk_offset, 0);
else
ds_read_packet(demuxer->video, demuxer->stream, film_chunk.chunk_size,
film_chunk.video_chunk_number / sh_video->fps,
film_chunk.chunk_offset, 0);
film_data->current_chunk++;
return 1;
}
demuxer_t* demux_open_film(demuxer_t* demuxer)
{
sh_video_t *sh_video = NULL;
sh_audio_t *sh_audio = NULL;
film_data_t *film_data;
film_chunk_t film_chunk;
int header_size;
unsigned int chunk_type;
unsigned int chunk_size;
int i;
unsigned int video_format;
int largest_audio_chunk = 0;
int audio_channels;
film_data = (film_data_t *)malloc(sizeof(film_data_t));
film_data->total_chunks = 0;
film_data->current_chunk = 0;
film_data->total_video_chunks = 0;
film_data->chunks = NULL;
// go back to the beginning
stream_reset(demuxer->stream);
stream_seek(demuxer->stream, 0);
// read the master chunk type
chunk_type = stream_read_fourcc(demuxer->stream);
// validate the chunk type
if (chunk_type != CHUNK_FILM)
{
mp_msg(MSGT_DEMUX, MSGL_ERR, "Not a FILM file\n");
return(NULL);
}
// get the header size, which implicitly points past the header and
// to the start of the data
header_size = stream_read_dword(demuxer->stream);
demuxer->movi_start = header_size;
demuxer->movi_end = demuxer->stream->end_pos;
header_size -= 16;
// skip to where the next chunk should be
stream_skip(demuxer->stream, 8);
// traverse through the header
while (header_size > 0)
{
// fetch the chunk type and size
chunk_type = stream_read_fourcc(demuxer->stream);
chunk_size = stream_read_dword(demuxer->stream);
header_size -= chunk_size;
switch (chunk_type)
{
case CHUNK_FDSC:
mp_msg(MSGT_DECVIDEO, MSGL_V, "parsing FDSC chunk\n");
// fetch the video codec fourcc to see if there's any video
video_format = stream_read_fourcc(demuxer->stream);
if (video_format)
{
// create and initialize the video stream header
sh_video = new_sh_video(demuxer, 0);
demuxer->video->sh = sh_video;
sh_video->ds = demuxer->video;
sh_video->format = video_format;
sh_video->disp_h = stream_read_dword(demuxer->stream);
sh_video->disp_w = stream_read_dword(demuxer->stream);
sh_video->fps = stream_read_char(demuxer->stream);
sh_video->frametime = 1/sh_video->fps;
mp_msg(MSGT_DECVIDEO, MSGL_V,
" FILM video: %d x %d, %f fps\n", sh_video->disp_w,
sh_video->disp_h, sh_video->fps);
}
else
stream_skip(demuxer->stream, 9);
// fetch the audio channels to see if there's any audio
audio_channels = stream_read_char(demuxer->stream);
if (audio_channels > 0)
{
// create and initialize the audio stream header
sh_audio = new_sh_audio(demuxer, 0);
demuxer->audio->sh = sh_audio;
sh_audio->ds = demuxer->audio;
// go through the bother of making a WAVEFORMATEX structure
sh_audio->wf = (WAVEFORMATEX *)malloc(sizeof(WAVEFORMATEX));
// uncompressed PCM format
sh_audio->wf->wFormatTag = 1;
sh_audio->format = 1;
sh_audio->wf->nChannels = audio_channels;
sh_audio->wf->wBitsPerSample = stream_read_char(demuxer->stream);
stream_skip(demuxer->stream, 1); // skip unknown byte
sh_audio->wf->nSamplesPerSec = stream_read_word(demuxer->stream);
sh_audio->wf->nAvgBytesPerSec =
sh_audio->wf->nSamplesPerSec * sh_audio->wf->wBitsPerSample / 8;
stream_skip(demuxer->stream, 6); // skip the rest of the unknown
mp_msg(MSGT_DECVIDEO, MSGL_V,
" FILM audio: %d channels, %d bits, %d Hz\n",
sh_audio->wf->nChannels, 8 * sh_audio->wf->wBitsPerSample,
sh_audio->wf->nSamplesPerSec);
}
else
stream_skip(demuxer->stream, 10);
break;
case CHUNK_STAB:
mp_msg(MSGT_DECVIDEO, MSGL_V, "parsing STAB chunk\n");
// skip unknown dword
stream_skip(demuxer->stream, 4);
// fetch the number of chunks
film_data->total_chunks = stream_read_dword(demuxer->stream);
film_data->current_chunk = 0;
mp_msg(MSGT_DECVIDEO, MSGL_V,
" STAB chunk contains %d chunks\n", film_data->total_chunks);
// allocate enough entries for the chunk
film_data->chunks =
(film_chunk_t *)malloc(film_data->total_chunks * sizeof(film_chunk_t));
// build the chunk index
for (i = 0; i < film_data->total_chunks; i++)
{
film_chunk = film_data->chunks[i];
film_chunk.chunk_offset =
demuxer->movi_start + stream_read_dword(demuxer->stream);
film_chunk.chunk_size = stream_read_dword(demuxer->stream) - 8;
film_chunk.flags1 = stream_read_dword(demuxer->stream);
film_chunk.flags2 = stream_read_dword(demuxer->stream);
film_data->chunks[i] = film_chunk;
// audio housekeeping
if ((film_chunk.flags1 == 0xFFFFFFFF) &&
(film_chunk.chunk_size > largest_audio_chunk))
largest_audio_chunk = film_chunk.chunk_size;
film_data->total_audio_sample_count +=
(chunk_size / sh_audio->wf->nChannels);
// video housekeeping
if (film_chunk.flags1 != 0xFFFFFFFF)
film_chunk.video_chunk_number =
film_data->total_video_chunks++;
}
break;
default:
mp_msg(MSGT_DEMUX, MSGL_ERR, "Unrecognized FILM header chunk: %08X\n",
chunk_type);
return(NULL);
break;
}
}
demuxer->priv = film_data;
return demuxer;
}
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