mpeg2dec.c

mpeg2 decoder filter过滤服务端

/*
 * mpeg2dec.c
 * Copyright (C) 2000-2003 Michel Lespinasse <[e-mail]>
 * Copyright (C) 1999-2000 Aaron Holtzman <[e-mail]>
 *
 * This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
 * See http://libmpeg2.sourceforge.net/ for updates.
 *
 * mpeg2dec is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * mpeg2dec is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <getopt.h>
#ifdef HAVE_IO_H
#include <fcntl.h>
#include <io.h>
#endif
#ifdef LIBVO_SDL
#include <SDL/SDL.h>
#endif
#include <inttypes.h>

#include "mpeg2.h"
#include "video_out.h"
#include "gettimeofday.h"

static int buffer_size = 4096;
static FILE * in_file;
static int demux_track = 0;
static int demux_pid = 0;
static int demux_pva = 0;
static mpeg2dec_t * mpeg2dec;
static vo_open_t * output_open = NULL;
static vo_instance_t * output;
static int sigint = 0;
static int total_offset = 0;
static int verbose = 0;

void dump_state (FILE * f, mpeg2_state_t state, const mpeg2_info_t * info,
		 int offset, int verbose);

#ifdef HAVE_GETTIMEOFDAY

static RETSIGTYPE signal_handler (int sig)
{
    sigint = 1;
    signal (sig, SIG_DFL);
    return (RETSIGTYPE)0;
}

static void print_fps (int final)
{
    static uint32_t frame_counter = 0;
    static struct timeval tv_beg, tv_start;
    static int total_elapsed;
    static int last_count = 0;
    struct timeval tv_end;
    float fps, tfps;
    int frames, elapsed;

    if (verbose)
	return;

    gettimeofday (&tv_end, NULL);

    if (!frame_counter) {
	tv_start = tv_beg = tv_end;
	signal (SIGINT, signal_handler);
    }

    elapsed = (tv_end.tv_sec - tv_beg.tv_sec) * 100 +
	(tv_end.tv_usec - tv_beg.tv_usec) / 10000;
    total_elapsed = (tv_end.tv_sec - tv_start.tv_sec) * 100 +
	(tv_end.tv_usec - tv_start.tv_usec) / 10000;

    if (final) {
	if (total_elapsed)
	    tfps = frame_counter * 100.0 / total_elapsed;
	else
	    tfps = 0;

	fprintf (stderr,"\n%d frames decoded in %.2f seconds (%.2f fps)\n",
		 frame_counter, total_elapsed / 100.0, tfps);

	return;
    }

    frame_counter++;

    if (elapsed < 50)	/* only display every 0.50 seconds */
	return;

    tv_beg = tv_end;
    frames = frame_counter - last_count;

    fps = frames * 100.0 / elapsed;
    tfps = frame_counter * 100.0 / total_elapsed;

    fprintf (stderr, "%d frames in %.2f sec (%.2f fps), "
	     "%d last %.2f sec (%.2f fps)\033[K\r", frame_counter,
	     total_elapsed / 100.0, tfps, frames, elapsed / 100.0, fps);

    last_count = frame_counter;
}

#else /* !HAVE_GETTIMEOFDAY */

static void print_fps (int final)
{
}

#endif

static void print_usage (char ** argv)
{
    int i;
    vo_driver_t const * drivers;

    fprintf (stderr, "usage: "
	     "%s [-h] [-o <mode>] [-s [<track>]] [-t <pid>] [-p] [-c] \\\n"
	     "\t\t[-v] [-b <bufsize>] <file>\n"
	     "\t-h\tdisplay help and available video output modes\n"
	     "\t-s\tuse program stream demultiplexer, "
	     "track 0-15 or 0xe0-0xef\n"
	     "\t-t\tuse transport stream demultiplexer, pid 0x10-0x1ffe\n"
	     "\t-p\tuse pva demultiplexer\n"
	     "\t-c\tuse c implementation, disables all accelerations\n"
	     "\t-v\tverbose information about the MPEG stream\n"
	     "\t-b\tset input buffer size, default 4096 bytes\n"
	     "\t-o\tvideo output mode\n", argv[0]);

    drivers = vo_drivers ();
    for (i = 0; drivers[i].name; i++)
	fprintf (stderr, "\t\t\t%s\n", drivers[i].name);

    exit (1);
}

static void handle_args (int argc, char ** argv)
{
    int c;
    vo_driver_t const * drivers;
    int i;
    char * s;

    drivers = vo_drivers ();
    while ((c = getopt (argc, argv, "hs::t:pco:vb::")) != -1)
	switch (c) {
	case 'o':
	    for (i = 0; drivers[i].name != NULL; i++)
		if (strcmp (drivers[i].name, optarg) == 0)
		    output_open = drivers[i].open;
	    if (output_open == NULL) {
		fprintf (stderr, "Invalid video driver: %s\n", optarg);
		print_usage (argv);
	    }
	    break;

	case 's':
	    demux_track = 0xe0;
	    if (optarg != NULL) {
		demux_track = strtol (optarg, &s, 0);
		if (demux_track < 0xe0)
		    demux_track += 0xe0;
		if (demux_track < 0xe0 || demux_track > 0xef || *s) {
		    fprintf (stderr, "Invalid track number: %s\n", optarg);
		    print_usage (argv);
		}
	    }
	    break;

	case 't':
	    demux_pid = strtol (optarg, &s, 0);
	    if (demux_pid < 0x10 || demux_pid > 0x1ffe || *s) {
		fprintf (stderr, "Invalid pid: %s\n", optarg);
		print_usage (argv);
	    }
	    break;

	case 'p':
	    demux_pva = 1;
	    break;

	case 'c':
	    mpeg2_accel (0);
	    break;

	case 'v':
	    if (++verbose > 4)
		print_usage (argv);
	    break;

	case 'b':
	    buffer_size = 1;
	    if (optarg != NULL) {
		buffer_size = strtol (optarg, &s, 0);
		if (buffer_size < 1 || *s) {
		    fprintf (stderr, "Invalid buffer size: %s\n", optarg);
		    print_usage (argv);
		}
	    }
	    break;

	default:
	    print_usage (argv);
	}

    /* -o not specified, use a default driver */
    if (output_open == NULL)
	output_open = drivers[0].open;

    if (optind < argc) {
	in_file = fopen (argv[optind], "rb");
	if (!in_file) {
	    fprintf (stderr, "%s - could not open file %s\n", strerror (errno),
		     argv[optind]);
	    exit (1);
	}
    } else
	in_file = stdin;
}

static void * malloc_hook (unsigned size, mpeg2_alloc_t reason)
{
    void * buf;

    /*
     * Invalid streams can refer to fbufs that have not been
     * initialized yet. For example the stream could start with a
     * picture type onther than I. Or it could have a B picture before
     * it gets two reference frames. Or, some slices could be missing.
     *
     * Consequently, the output depends on the content 2 output
     * buffers have when the sequence begins. In release builds, this
     * does not matter (garbage in, garbage out), but in test code, we
     * always zero all our output buffers to:
     * - make our test produce deterministic outputs
     * - hint checkergcc that it is fine to read from all our output
     *   buffers at any time
     */
    if ((int)reason < 0) {
        return NULL;
    }
    buf = mpeg2_malloc (size, (mpeg2_alloc_t)-1);
    if (buf && (reason == MPEG2_ALLOC_YUV || reason == MPEG2_ALLOC_CONVERTED))
        memset (buf, 0, size);
    return buf;
}

static void decode_mpeg2 (uint8_t * current, uint8_t * end)
{
    const mpeg2_info_t * info;
    mpeg2_state_t state;
    vo_setup_result_t setup_result;

    mpeg2_buffer (mpeg2dec, current, end);
    total_offset += end - current;

    info = mpeg2_info (mpeg2dec);
    while (1) {
	state = mpeg2_parse (mpeg2dec);
	if (verbose)
	    dump_state (stderr, state, info,
			total_offset - mpeg2_getpos (mpeg2dec), verbose);
	switch (state) {
	case STATE_BUFFER:
	    return;
	case STATE_SEQUENCE:
	    /* might set nb fbuf, convert format, stride */
	    /* might set fbufs */
	    if (output->setup (output, info->sequence->width,
			       info->sequence->height,
			       info->sequence->chroma_width,
			       info->sequence->chroma_height, &setup_result)) {
		fprintf (stderr, "display setup failed\n");
		exit (1);
	    }
	    if (setup_result.convert &&
		mpeg2_convert (mpeg2dec, setup_result.convert, NULL)) {
		fprintf (stderr, "color conversion setup failed\n");
		exit (1);
	    }
	    if (output->set_fbuf) {
		uint8_t * buf[3];
		void * id;

		mpeg2_custom_fbuf (mpeg2dec, 1);
		output->set_fbuf (output, buf, &id);
		mpeg2_set_buf (mpeg2dec, buf, id);
		output->set_fbuf (output, buf, &id);
		mpeg2_set_buf (mpeg2dec, buf, id);
	    } else if (output->setup_fbuf) {
		uint8_t * buf[3];
		void * id;

		output->setup_fbuf (output, buf, &id);
		mpeg2_set_buf (mpeg2dec, buf, id);
		output->setup_fbuf (output, buf, &id);
		mpeg2_set_buf (mpeg2dec, buf, id);
		output->setup_fbuf (output, buf, &id);
		mpeg2_set_buf (mpeg2dec, buf, id);
	    }
	    mpeg2_skip (mpeg2dec, (output->draw == NULL));
	    break;
	case STATE_PICTURE:
	    /* might skip */
	    /* might set fbuf */
	    if (output->set_fbuf) {
		uint8_t * buf[3];
		void * id;

		output->set_fbuf (output, buf, &id);
		mpeg2_set_buf (mpeg2dec, buf, id);
	    }
	    if (output->start_fbuf)
		output->start_fbuf (output, info->current_fbuf->buf,
				    info->current_fbuf->id);
	    break;
	case STATE_SLICE:
	case STATE_END:
	case STATE_INVALID_END:
	    /* draw current picture */
	    /* might free frame buffer */
	    if (info->display_fbuf) {
		if (output->draw)
		    output->draw (output, info->display_fbuf->buf,
				  info->display_fbuf->id);
		print_fps (0);
	    }
	    if (output->discard && info->discard_fbuf)
		output->discard (output, info->discard_fbuf->buf,
				 info->discard_fbuf->id);
	    break;
	default:
	    break;
	}
    }
}

#define DEMUX_PAYLOAD_START 1
static int demux (uint8_t * buf, uint8_t * end, int flags)
{
    static int mpeg1_skip_table[16] = {
	0, 0, 4, 9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
    };

    /*
     * the demuxer keeps some state between calls:
     * if "state" = DEMUX_HEADER, then "head_buf" contains the first
     *     "bytes" bytes from some header.
     * if "state" == DEMUX_DATA, then we need to copy "bytes" bytes
     *     of ES data before the next header.
     * if "state" == DEMUX_SKIP, then we need to skip "bytes" bytes
     *     of data before the next header.
     *
     * NEEDBYTES makes sure we have the requested number of bytes for a
     * header. If we dont, it copies what we have into head_buf and returns,
     * so that when we come back with more data we finish decoding this header.
     *
     * DONEBYTES updates "buf" to point after the header we just parsed.
     */

#define DEMUX_HEADER 0
#define DEMUX_DATA 1
#define DEMUX_SKIP 2
    static int state = DEMUX_SKIP;
    static int state_bytes = 0;
    static uint8_t head_buf[264];

    uint8_t * header;
    int bytes;
    int len;

#define NEEDBYTES(x)						\
    do {							\
	int missing;						\
								\
	missing = (x) - bytes;					\
	if (missing > 0) {					\
	    if (header == head_buf) {				\
		if (missing <= end - buf) {			\
		    memcpy (header + bytes, buf, missing);	\
		    buf += missing;				\