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mpv/demux/demux_mng.c
wm4 72bdc5d3af core: use playback time to determine playback percent position
The percent position is used for the OSD, the status line, and for the
OSD bar (shown on seeks). By default, the PTS of the last demuxed packet
was used to calculate it. This led to a "jumpy" display when the
percentage value (casted to int) was changing. The reasons for this were
the presence of video frame reordering (packet PTS is not monotonic), or
getting PTS values from different streams (like audio/subs).

Since these rely on PTS values and correct file durations anyway,
simplify it by calculating it with the current playback position in
mplayer.c instead.
2013-02-26 02:01:48 +01:00

613 lines
20 KiB
C

/*
* MNG file demuxer for MPlayer
*
* Copyright (C) 2008 Stefan Schuermans <stefan blinkenarea org>
*
* This file is part of MPlayer.
*
* MPlayer 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.
*
* MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "config.h"
#include "core/mp_msg.h"
#include "stream/stream.h"
#include "demux.h"
#include "stheader.h"
#include "video/img_fourcc.h"
#define MNG_SUPPORT_READ
#define MNG_SUPPORT_DISPLAY
#include <libmng.h>
/**
* \brief some small fixed start time > 0
*
* Start time must be > 0 for the variable frame time mechanism
* (GIF, MATROSKA, MNG) in video.c to work for the first frame.
*/
#define MNG_START_PTS 0.01f
/**
* \brief private context structure
*
* This structure is used as private data for MPlayer demuxer
* and also as private data for the MNG library.
*
* All members ending in \p _ms are in milliseconds
*/
typedef struct {
stream_t * stream; ///< pointer to MNG data input stream
mng_handle h_mng; ///< MNG library image handle
int header_processed; ///< if MNG image header is processed
mng_uint32 width; ///< MNG image width
mng_uint32 height; ///< MNG image height
int total_time_ms; ///< total MNG animation time
unsigned char * canvas; /**< \brief canvas to draw the image onto
* \details
* \li lines top-down
* \li pixels left-to-right
* \li channels RGB
* \li no padding
* \li NULL if no canvas yet
*/
int displaying; /**< \brief if displaying already,
* i.e. if mng_display has
* already been called
*/
int finished; ///< if animation is finished
int global_time_ms; ///< current global time for MNG library
int anim_cur_time_ms; ///< current frame time in MNG animation
int anim_frame_duration_ms; ///< current frame duration in MNG animation
int show_cur_time_ms; /**< \brief current time in the show process,
* i.e. time of last demux packet
*/
int show_next_time_ms; /**< \brief next time in the show process,
* i.e. time of next demux packet
*/
int timer_ms; /**< \brief number of milliseconds after which
* libmng wants to be called again
*/
} mng_priv_t;
/**
* \brief MNG library callback: Allocate a new zero-filled memory block.
* \param[in] size memory block size
* \return pointer to new memory block
*/
static mng_ptr demux_mng_alloc(mng_size_t size)
{
return calloc(1, size);
}
/**
* \brief MNG library callback: Free memory block.
* \param[in] ptr pointer to memory block
* \param[in] size memory block size
*/
static void demux_mng_free(mng_ptr ptr, mng_size_t size)
{
free(ptr);
}
/**
* \brief MNG library callback: Open MNG stream.
* \param[in] h_mng MNG library image handle
* \return \p MNG_TRUE on success, \p MNG_FALSE on error (never happens)
*/
static mng_bool demux_mng_openstream(mng_handle h_mng)
{
mng_priv_t * mng_priv = mng_get_userdata(h_mng);
stream_t * stream = mng_priv->stream;
// rewind stream to the beginning
stream_seek(stream, stream->start_pos);
return MNG_TRUE;
}
/**
* \brief MNG library callback: Close MNG stream.
* \param[in] h_mng MNG library image handle
* \return \p MNG_TRUE on success, \p MNG_FALSE on error (never happens)
*/
static mng_bool demux_mng_closestream(mng_handle h_mng)
{
return MNG_TRUE;
}
/**
* \brief MNG library callback: Read data from stream.
* \param[in] h_mng MNG library image handle
* \param[in] buf pointer to buffer to fill with data
* \param[in] size size of buffer
* \param[out] read number of bytes read from stream
* \return \p MNG_TRUE on success, \p MNG_FALSE on error (never happens)
*/
static mng_bool demux_mng_readdata(mng_handle h_mng, mng_ptr buf,
mng_uint32 size, mng_uint32 * read)
{
mng_priv_t * mng_priv = mng_get_userdata(h_mng);
stream_t * stream = mng_priv->stream;
// simply read data from stream and return number of bytes or error
*read = stream_read(stream, buf, size);
return MNG_TRUE;
}
/**
* \brief MNG library callback: Header information is processed now.
* \param[in] h_mng MNG library image handle
* \param[in] width image width
* \param[in] height image height
* \return \p MNG_TRUE on success, \p MNG_FALSE on error
*/
static mng_bool demux_mng_processheader(mng_handle h_mng, mng_uint32 width,
mng_uint32 height)
{
mng_priv_t * mng_priv = mng_get_userdata(h_mng);
// remember size in private data
mng_priv->header_processed = 1;
mng_priv->width = width;
mng_priv->height = height;
// get total animation time
mng_priv->total_time_ms = mng_get_playtime(h_mng);
// allocate canvas
mng_priv->canvas = malloc(height * width * 4);
if (!mng_priv->canvas) {
mp_msg(MSGT_DEMUX, MSGL_ERR,
"demux_mng: could not allocate canvas of size %dx%d\n",
width, height);
return MNG_FALSE;
}
return MNG_TRUE;
}
/**
* \brief MNG library callback: Get access to a canvas line.
* \param[in] h_mng MNG library image handle
* \param[in] line y coordinate of line to access
* \return pointer to line on success, \p MNG_NULL on error
*/
static mng_ptr demux_mng_getcanvasline(mng_handle h_mng, mng_uint32 line)
{
mng_priv_t * mng_priv = mng_get_userdata(h_mng);
// return pointer to canvas line
if (line < mng_priv->height && mng_priv->canvas)
return (mng_ptr)(mng_priv->canvas + line * mng_priv->width * 4);
else
return (mng_ptr)MNG_NULL;
}
/**
* \brief MNG library callback: A part of the canvas should be shown.
*
* This function is called by libmng whenever it thinks a
* rectangular part of the display should be updated. This
* can happen multiple times for a frame and/or a single time
* for a frame. Only the the part of the display occupied by
* the rectangle defined by x, y, width, height is to be updated.
* It is possible that some parts of the display are not updated
* for many frames. There is no chance here to find out if the
* current frame is completed with this update or not.
*
* This mechanism does not match MPlayer's demuxer architecture,
* so it will not be used exactly as intended by libmng.
* A new frame is generated in the demux_mng_fill_buffer() function
* whenever libmng tells us to wait for some time.
*
* \param[in] h_mng MNG library image handle
* \param[in] x rectangle's left edge
* \param[in] y rectangle's top edge
* \param[in] width rectangle's width
* \param[in] height rectangle's heigt
* \return \p MNG_TRUE on success, \p MNG_FALSE on error (never happens)
*/
static mng_bool demux_mng_refresh(mng_handle h_mng, mng_uint32 x, mng_uint32 y,
mng_uint32 width, mng_uint32 height)
{
// nothing to do here, the image data is already on the canvas
return MNG_TRUE;
}
/**
* \brief MNG library callback: Get how many milliseconds have passed.
* \param[in] h_mng MNG library image handle
* \return global time in milliseconds
*/
static mng_uint32 demux_mng_gettickcount(mng_handle h_mng)
{
mng_priv_t * mng_priv = mng_get_userdata(h_mng);
// return current global time
return mng_priv->global_time_ms;
}
/**
* \brief MNG library callback: Please call again after some milliseconds.
* \param[in] h_mng MNG library image handle
* \param[in] msecs number of milliseconds after which to call again
* \return \p MNG_TRUE on success, \p MNG_FALSE on error (never happens)
*/
static mng_bool demux_mng_settimer(mng_handle h_mng, mng_uint32 msecs)
{
mng_priv_t * mng_priv = mng_get_userdata(h_mng);
// Save number of milliseconds after which to call the MNG library again
// in private data.
mng_priv->timer_ms = msecs;
return MNG_TRUE;
}
/**
* \brief MPlayer callback: Check if stream contains MNG data.
* \param[in] demuxer demuxer structure
* \return demuxer type constant, \p 0 if unknown
*/
static int demux_mng_check_file(demuxer_t *demuxer)
{
char buf[4];
if (stream_read(demuxer->stream, buf, 4) != 4)
return 0;
if (memcmp(buf, "\x8AMNG", 4))
return 0;
return DEMUXER_TYPE_MNG;
}
/**
* \brief MPlayer callback: Fill buffer from MNG stream.
* \param[in] demuxer demuxer structure
* \param[in] ds demuxer stream
* \return \p 1 on success, \p 0 on error
*/
static int demux_mng_fill_buffer(demuxer_t * demuxer,
demux_stream_t * ds)
{
mng_priv_t * mng_priv = demuxer->priv;
mng_handle h_mng = mng_priv->h_mng;
mng_retcode mng_ret;
demux_packet_t * dp;
// exit if animation is finished
if (mng_priv->finished)
return 0;
// advance animation to requested next show time
while (mng_priv->anim_cur_time_ms + mng_priv->anim_frame_duration_ms
<= mng_priv->show_next_time_ms && !mng_priv->finished) {
// advance global and animation time
mng_priv->global_time_ms += mng_priv->anim_frame_duration_ms;
mng_priv->anim_cur_time_ms += mng_priv->anim_frame_duration_ms;
// Clear variable MNG library will write number of milliseconds to
// (via settimer callback).
mng_priv->timer_ms = 0;
// get next image from MNG library
if (mng_priv->displaying)
mng_ret = mng_display_resume(h_mng); // resume displaying MNG data
// to canvas
else
mng_ret = mng_display(h_mng); // start displaying MNG data to canvas
if (mng_ret && mng_ret != MNG_NEEDTIMERWAIT) {
mp_msg(MSGT_DEMUX, MSGL_ERR,
"demux_mng: could not display MNG data to canvas: "
"mng_retcode %d\n", mng_ret);
return 0;
}
mng_priv->displaying = 1; // mng_display() has been called now
mng_priv->finished = mng_ret == 0; // animation is finished iff
// mng_display() returned 0
// save current frame duration
mng_priv->anim_frame_duration_ms = mng_priv->timer_ms < 1
? 1 : mng_priv->timer_ms;
} // while (mng_priv->anim_cur_time_ms + ...
// create a new demuxer packet
dp = new_demux_packet(mng_priv->height * mng_priv->width * 4);
// copy image data into demuxer packet
memcpy(dp->buffer, mng_priv->canvas,
mng_priv->height * mng_priv->width * 4);
// set current show time to requested show time
mng_priv->show_cur_time_ms = mng_priv->show_next_time_ms;
// get time of next frame to show
mng_priv->show_next_time_ms = mng_priv->anim_cur_time_ms
+ mng_priv->anim_frame_duration_ms;
// Set position and timing information in demuxer video and demuxer packet.
// - Time must be time of next frame and always be > 0 for the variable
// frame time mechanism (GIF, MATROSKA, MNG) in video.c to work.
demuxer->video->dpos++;
dp->pts = (float)mng_priv->show_next_time_ms / 1000.0f + MNG_START_PTS;
dp->pos = stream_tell(demuxer->stream);
ds_add_packet(demuxer->video, dp);
return 1;
}
/**
* \brief MPlayer callback: Open MNG stream.
* \param[in] demuxer demuxer structure
* \return demuxer structure on success, \p NULL on error
*/
static demuxer_t * demux_mng_open(demuxer_t * demuxer)
{
mng_priv_t * mng_priv;
mng_handle h_mng;
mng_retcode mng_ret;
sh_video_t * sh_video;
// create private data structure
mng_priv = calloc(1, sizeof(mng_priv_t));
//stream pointer into private data
mng_priv->stream = demuxer->stream;
// initialize MNG image instance
h_mng = mng_initialize((mng_ptr)mng_priv, demux_mng_alloc,
demux_mng_free, MNG_NULL);
if (!h_mng) {
mp_msg(MSGT_DEMUX, MSGL_ERR,
"demux_mng: could not initialize MNG image instance\n");
free(mng_priv);
return NULL;
}
// MNG image handle into private data
mng_priv->h_mng = h_mng;
// set required MNG callbacks
if (mng_setcb_openstream(h_mng, demux_mng_openstream) ||
mng_setcb_closestream(h_mng, demux_mng_closestream) ||
mng_setcb_readdata(h_mng, demux_mng_readdata) ||
mng_setcb_processheader(h_mng, demux_mng_processheader) ||
mng_setcb_getcanvasline(h_mng, demux_mng_getcanvasline) ||
mng_setcb_refresh(h_mng, demux_mng_refresh) ||
mng_setcb_gettickcount(h_mng, demux_mng_gettickcount) ||
mng_setcb_settimer(h_mng, demux_mng_settimer) ||
mng_set_canvasstyle(h_mng, MNG_CANVAS_RGBA8)) {
mp_msg(MSGT_DEMUX, MSGL_ERR,
"demux_mng: could not set MNG callbacks\n");
mng_cleanup(&h_mng);
free(mng_priv);
return NULL;
}
// start reading MNG data
mng_ret = mng_read(h_mng);
if (mng_ret) {
mp_msg(MSGT_DEMUX, MSGL_ERR,
"demux_mng: could not start reading MNG data: "
"mng_retcode %d\n", mng_ret);
mng_cleanup(&h_mng);
free(mng_priv);
return NULL;
}
// check that MNG header is processed now
if (!mng_priv->header_processed) {
mp_msg(MSGT_DEMUX, MSGL_ERR,
"demux_mng: internal error: header not processed\n");
mng_cleanup(&h_mng);
free(mng_priv);
return NULL;
}
// create a new video stream header
sh_video = new_sh_video(demuxer, 0);
// Make sure the demuxer knows about the new video stream header
// (even though new_sh_video() ought to take care of it).
// (Thanks to demux_gif.c for this.)
demuxer->video->sh = sh_video;
// Make sure that the video demuxer stream header knows about its
// parent video demuxer stream (this is getting wacky), or else
// video_read_properties() will choke.
// (Thanks to demux_gif.c for this.)
sh_video->ds = demuxer->video;
// set format of pixels in video packets
sh_video->gsh->codec = "rawvideo";
sh_video->format = MP_FOURCC_RGB32;
// set framerate to some value (MNG does not have a fixed framerate)
sh_video->fps = 5.0f;
sh_video->frametime = 1.0f / sh_video->fps;
// set video frame parameters
sh_video->bih = calloc(1, sizeof(*sh_video->bih));
sh_video->bih->biCompression = sh_video->format;
sh_video->bih->biWidth = mng_priv->width;
sh_video->bih->biHeight = mng_priv->height;
sh_video->bih->biBitCount = 32;
sh_video->bih->biPlanes = 1;
// Set start time to something > 0.
// - This is required for the variable frame time mechanism
// (GIF, MATROSKA, MNG) in video.c to work for the first frame.
sh_video->ds->pts = MNG_START_PTS;
// set private data in demuxer and return demuxer
demuxer->priv = mng_priv;
return demuxer;
}
/**
* \brief MPlayer callback: Close MNG stream.
* \param[in] demuxer demuxer structure
*/
static void demux_mng_close(demuxer_t* demuxer)
{
mng_priv_t * mng_priv = demuxer->priv;
if (mng_priv) {
// shutdown MNG image instance
if (mng_priv->h_mng)
mng_cleanup(&mng_priv->h_mng);
// free private data
free(mng_priv->canvas);
free(mng_priv);
}
}
/**
* \brief MPlayer callback: Seek in MNG stream.
* \param[in] demuxer demuxer structure
* \param[in] rel_seek_secs relative seek time in seconds
* \param[in] audio_delay unused, MNG does not contain audio
* \param[in] flags bit flags, \p 1: absolute, \p 2: fractional position
*/
static void demux_mng_seek(demuxer_t * demuxer, float rel_seek_secs,
float audio_delay, int flags)
{
mng_priv_t * mng_priv = demuxer->priv;
mng_handle h_mng = mng_priv->h_mng;
mng_retcode mng_ret;
int seek_ms, pos_ms;
// exit if not ready to seek (header not yet read or not yet displaying)
if (!mng_priv->header_processed || !mng_priv->displaying)
return;
// get number of milliseconds to seek to
if (flags & 2) // seek by fractional position (0.0 ... 1.0)
seek_ms = (int)(rel_seek_secs * (float)mng_priv->total_time_ms);
else // seek by time in seconds
seek_ms = (int)(rel_seek_secs * 1000.0f + 0.5f);
// get new position in milliseconds
if (flags & 1) // absolute
pos_ms = seek_ms;
else // relative
pos_ms = mng_priv->show_cur_time_ms + seek_ms;
// fix position
if (pos_ms < 0)
pos_ms = 0;
if (pos_ms > mng_priv->total_time_ms)
pos_ms = mng_priv->total_time_ms;
// FIXME
// In principle there is a function to seek in MNG: mng_display_gotime().
// - Using it did not work out (documentation is very brief,
// example code does not exist?).
// - The following code works, but its performance is quite bad.
// seeking forward
if (pos_ms >= mng_priv->show_cur_time_ms) {
// Simply advance show time to seek position.
// - Everything else will be handled in demux_mng_fill_buffer().
mng_priv->show_next_time_ms = pos_ms;
} // if (pos_ms > mng_priv->show_time_ms)
// seeking backward
else { // if (pos_ms > mng_priv->show_time_ms)
// Clear variable MNG library will write number of milliseconds to
// (via settimer callback).
mng_priv->timer_ms = 0;
// Restart displaying and advance show time to seek position.
// - Everything else will be handled in demux_mng_fill_buffer().
mng_ret = mng_display_reset(h_mng);
// If a timer wait is needed, fool libmng that requested time
// passed and try again.
if (mng_ret == MNG_NEEDTIMERWAIT) {
mng_priv->global_time_ms += mng_priv->timer_ms;
mng_ret = mng_display_reset(h_mng);
}
if (mng_ret) {
mp_msg(MSGT_DEMUX, MSGL_ERR,
"demux_mng: could not reset MNG display state: "
"mng_retcode %d\n", mng_ret);
return;
}
mng_priv->displaying = 0;
mng_priv->finished = 0;
mng_priv->anim_cur_time_ms = 0;
mng_priv->anim_frame_duration_ms = 0;
mng_priv->show_next_time_ms = pos_ms;
} // if (pos_ms > mng_priv->show_time_ms) ... else
}
/**
* \brief MPlayer callback: Control MNG stream.
* \param[in] demuxer demuxer structure
* \param[in] cmd code of control command to perform
* \param[in,out] arg command argument
* \return demuxer control response code
*/
static int demux_mng_control(demuxer_t * demuxer, int cmd, void * arg)
{
mng_priv_t * mng_priv = demuxer->priv;
switch(cmd) {
// get total movie length
case DEMUXER_CTRL_GET_TIME_LENGTH:
if (mng_priv->header_processed) {
*(double *)arg = (double)mng_priv->total_time_ms / 1000.0;
return DEMUXER_CTRL_OK;
} else {
return DEMUXER_CTRL_DONTKNOW;
}
break;
default:
return DEMUXER_CTRL_NOTIMPL;
} // switch (cmd)
}
const demuxer_desc_t demuxer_desc_mng = {
"MNG demuxer",
"mng",
"MNG",
"Stefan Schuermans <stefan@blinkenarea.org>",
"MNG files, using libmng",
DEMUXER_TYPE_MNG,
0, // unsafe autodetect (only checking magic at beginning of stream)
demux_mng_check_file,
demux_mng_fill_buffer,
demux_mng_open,
demux_mng_close,
demux_mng_seek,
demux_mng_control
};