mirror of
https://github.com/mpv-player/mpv
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fe3c4810e1
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@32624 b3059339-0415-0410-9bf9-f77b7e298cf2
623 lines
21 KiB
C
623 lines
21 KiB
C
/*
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* MNG file demuxer for MPlayer
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*
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* Copyright (C) 2008 Stefan Schuermans <stefan blinkenarea org>
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*
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* This file is part of MPlayer.
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*
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* MPlayer is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* MPlayer 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with MPlayer; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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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 "stream/stream.h"
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#include "demuxer.h"
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#include "stheader.h"
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#define MNG_SUPPORT_READ
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#define MNG_SUPPORT_DISPLAY
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#include <libmng.h>
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/**
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* \brief some small fixed start time > 0
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*
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* Start time must be > 0 for the variable frame time mechanism
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* (GIF, MATROSKA, MNG) in video.c to work for the first frame.
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*/
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#define MNG_START_PTS 0.01f
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/**
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* \brief private context structure
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*
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* This structure is used as private data for MPlayer demuxer
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* and also as private data for the MNG library.
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*
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* All members ending in \p _ms are in milliseconds
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*/
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typedef struct {
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stream_t * stream; ///< pointer to MNG data input stream
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mng_handle h_mng; ///< MNG library image handle
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int header_processed; ///< if MNG image header is processed
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mng_uint32 width; ///< MNG image width
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mng_uint32 height; ///< MNG image height
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int total_time_ms; ///< total MNG animation time
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unsigned char * canvas; /**< \brief canvas to draw the image onto
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* \details
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* \li lines top-down
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* \li pixels left-to-right
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* \li channels RGB
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* \li no padding
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* \li NULL if no canvas yet
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*/
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int displaying; /**< \brief if displaying already,
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* i.e. if mng_display has
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* already been called
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*/
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int finished; ///< if animation is finished
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int global_time_ms; ///< current global time for MNG library
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int anim_cur_time_ms; ///< current frame time in MNG animation
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int anim_frame_duration_ms; ///< current frame duration in MNG animation
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int show_cur_time_ms; /**< \brief current time in the show process,
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* i.e. time of last demux packet
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*/
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int show_next_time_ms; /**< \brief next time in the show process,
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* i.e. time of next demux packet
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*/
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int timer_ms; /**< \brief number of milliseconds after which
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* libmng wants to be called again
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*/
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} mng_priv_t;
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/**
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* \brief MNG library callback: Allocate a new zero-filled memory block.
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* \param[in] size memory block size
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* \return pointer to new memory block
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*/
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static mng_ptr demux_mng_alloc(mng_size_t size)
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{
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return calloc(1, size);
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}
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/**
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* \brief MNG library callback: Free memory block.
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* \param[in] ptr pointer to memory block
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* \param[in] size memory block size
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*/
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static void demux_mng_free(mng_ptr ptr, mng_size_t size)
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{
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free(ptr);
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}
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/**
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* \brief MNG library callback: Open MNG stream.
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* \param[in] h_mng MNG library image handle
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* \return \p MNG_TRUE on success, \p MNG_FALSE on error (never happens)
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*/
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static mng_bool demux_mng_openstream(mng_handle h_mng)
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{
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mng_priv_t * mng_priv = mng_get_userdata(h_mng);
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stream_t * stream = mng_priv->stream;
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// rewind stream to the beginning
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stream_seek(stream, stream->start_pos);
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return MNG_TRUE;
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}
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/**
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* \brief MNG library callback: Close MNG stream.
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* \param[in] h_mng MNG library image handle
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* \return \p MNG_TRUE on success, \p MNG_FALSE on error (never happens)
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*/
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static mng_bool demux_mng_closestream(mng_handle h_mng)
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{
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return MNG_TRUE;
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}
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/**
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* \brief MNG library callback: Read data from stream.
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* \param[in] h_mng MNG library image handle
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* \param[in] buf pointer to buffer to fill with data
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* \param[in] size size of buffer
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* \param[out] read number of bytes read from stream
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* \return \p MNG_TRUE on success, \p MNG_FALSE on error (never happens)
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*/
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static mng_bool demux_mng_readdata(mng_handle h_mng, mng_ptr buf,
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mng_uint32 size, mng_uint32 * read)
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{
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mng_priv_t * mng_priv = mng_get_userdata(h_mng);
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stream_t * stream = mng_priv->stream;
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// simply read data from stream and return number of bytes or error
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*read = stream_read(stream, buf, size);
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return MNG_TRUE;
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}
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/**
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* \brief MNG library callback: Header information is processed now.
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* \param[in] h_mng MNG library image handle
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* \param[in] width image width
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* \param[in] height image height
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* \return \p MNG_TRUE on success, \p MNG_FALSE on error
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*/
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static mng_bool demux_mng_processheader(mng_handle h_mng, mng_uint32 width,
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mng_uint32 height)
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{
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mng_priv_t * mng_priv = mng_get_userdata(h_mng);
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// remember size in private data
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mng_priv->header_processed = 1;
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mng_priv->width = width;
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mng_priv->height = height;
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// get total animation time
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mng_priv->total_time_ms = mng_get_playtime(h_mng);
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// allocate canvas
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mng_priv->canvas = malloc(height * width * 4);
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if (!mng_priv->canvas) {
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mp_msg(MSGT_DEMUX, MSGL_ERR,
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"demux_mng: could not allocate canvas of size %dx%d\n",
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width, height);
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return MNG_FALSE;
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}
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return MNG_TRUE;
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}
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/**
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* \brief MNG library callback: Get access to a canvas line.
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* \param[in] h_mng MNG library image handle
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* \param[in] line y coordinate of line to access
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* \return pointer to line on success, \p MNG_NULL on error
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*/
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static mng_ptr demux_mng_getcanvasline(mng_handle h_mng, mng_uint32 line)
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{
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mng_priv_t * mng_priv = mng_get_userdata(h_mng);
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// return pointer to canvas line
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if (line < mng_priv->height && mng_priv->canvas)
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return (mng_ptr)(mng_priv->canvas + line * mng_priv->width * 4);
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else
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return (mng_ptr)MNG_NULL;
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}
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/**
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* \brief MNG library callback: A part of the canvas should be shown.
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*
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* This function is called by libmng whenever it thinks a
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* rectangular part of the display should be updated. This
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* can happen multiple times for a frame and/or a single time
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* for a frame. Only the the part of the display occupied by
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* the rectangle defined by x, y, width, height is to be updated.
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* It is possible that some parts of the display are not updated
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* for many frames. There is no chance here to find out if the
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* current frame is completed with this update or not.
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*
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* This mechanism does not match MPlayer's demuxer architecture,
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* so it will not be used exactly as intended by libmng.
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* A new frame is generated in the demux_mng_fill_buffer() function
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* whenever libmng tells us to wait for some time.
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*
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* \param[in] h_mng MNG library image handle
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* \param[in] x rectangle's left edge
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* \param[in] y rectangle's top edge
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* \param[in] width rectangle's width
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* \param[in] height rectangle's heigt
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* \return \p MNG_TRUE on success, \p MNG_FALSE on error (never happens)
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*/
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static mng_bool demux_mng_refresh(mng_handle h_mng, mng_uint32 x, mng_uint32 y,
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mng_uint32 width, mng_uint32 height)
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{
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// nothing to do here, the image data is already on the canvas
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return MNG_TRUE;
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}
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/**
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* \brief MNG library callback: Get how many milliseconds have passed.
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* \param[in] h_mng MNG library image handle
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* \return global time in milliseconds
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*/
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static mng_uint32 demux_mng_gettickcount(mng_handle h_mng)
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{
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mng_priv_t * mng_priv = mng_get_userdata(h_mng);
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// return current global time
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return mng_priv->global_time_ms;
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}
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/**
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* \brief MNG library callback: Please call again after some milliseconds.
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* \param[in] h_mng MNG library image handle
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* \param[in] msecs number of milliseconds after which to call again
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* \return \p MNG_TRUE on success, \p MNG_FALSE on error (never happens)
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*/
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static mng_bool demux_mng_settimer(mng_handle h_mng, mng_uint32 msecs)
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{
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mng_priv_t * mng_priv = mng_get_userdata(h_mng);
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// Save number of milliseconds after which to call the MNG library again
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// in private data.
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mng_priv->timer_ms = msecs;
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return MNG_TRUE;
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}
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/**
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* \brief MPlayer callback: Check if stream contains MNG data.
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* \param[in] demuxer demuxer structure
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* \return demuxer type constant, \p 0 if unknown
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*/
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static int demux_mng_check_file(demuxer_t *demuxer)
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{
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char buf[4];
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if (stream_read(demuxer->stream, buf, 4) != 4)
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return 0;
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if (memcmp(buf, "\x8AMNG", 4))
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return 0;
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return DEMUXER_TYPE_MNG;
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}
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/**
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* \brief MPlayer callback: Fill buffer from MNG stream.
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* \param[in] demuxer demuxer structure
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* \param[in] ds demuxer stream
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* \return \p 1 on success, \p 0 on error
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*/
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static int demux_mng_fill_buffer(demuxer_t * demuxer,
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demux_stream_t * ds)
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{
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mng_priv_t * mng_priv = demuxer->priv;
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mng_handle h_mng = mng_priv->h_mng;
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mng_retcode mng_ret;
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demux_packet_t * dp;
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// exit if animation is finished
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if (mng_priv->finished)
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return 0;
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// advance animation to requested next show time
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while (mng_priv->anim_cur_time_ms + mng_priv->anim_frame_duration_ms
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<= mng_priv->show_next_time_ms && !mng_priv->finished) {
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// advance global and animation time
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mng_priv->global_time_ms += mng_priv->anim_frame_duration_ms;
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mng_priv->anim_cur_time_ms += mng_priv->anim_frame_duration_ms;
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// Clear variable MNG library will write number of milliseconds to
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// (via settimer callback).
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mng_priv->timer_ms = 0;
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// get next image from MNG library
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if (mng_priv->displaying)
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mng_ret = mng_display_resume(h_mng); // resume displaying MNG data
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// to canvas
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else
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mng_ret = mng_display(h_mng); // start displaying MNG data to canvas
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if (mng_ret && mng_ret != MNG_NEEDTIMERWAIT) {
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mp_msg(MSGT_DEMUX, MSGL_ERR,
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"demux_mng: could not display MNG data to canvas: "
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"mng_retcode %d\n", mng_ret);
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return 0;
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}
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mng_priv->displaying = 1; // mng_display() has been called now
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mng_priv->finished = mng_ret == 0; // animation is finished iff
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// mng_display() returned 0
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// save current frame duration
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mng_priv->anim_frame_duration_ms = mng_priv->timer_ms < 1
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? 1 : mng_priv->timer_ms;
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} // while (mng_priv->anim_cur_time_ms + ...
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// create a new demuxer packet
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dp = new_demux_packet(mng_priv->height * mng_priv->width * 4);
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// copy image data into demuxer packet
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memcpy(dp->buffer, mng_priv->canvas,
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mng_priv->height * mng_priv->width * 4);
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// set current show time to requested show time
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mng_priv->show_cur_time_ms = mng_priv->show_next_time_ms;
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// get time of next frame to show
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mng_priv->show_next_time_ms = mng_priv->anim_cur_time_ms
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+ mng_priv->anim_frame_duration_ms;
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// Set position and timing information in demuxer video and demuxer packet.
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// - Time must be time of next frame and always be > 0 for the variable
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// frame time mechanism (GIF, MATROSKA, MNG) in video.c to work.
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demuxer->video->dpos++;
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dp->pts = (float)mng_priv->show_next_time_ms / 1000.0f + MNG_START_PTS;
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dp->pos = stream_tell(demuxer->stream);
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ds_add_packet(demuxer->video, dp);
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return 1;
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}
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/**
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* \brief MPlayer callback: Open MNG stream.
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* \param[in] demuxer demuxer structure
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* \return demuxer structure on success, \p NULL on error
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*/
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static demuxer_t * demux_mng_open(demuxer_t * demuxer)
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{
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mng_priv_t * mng_priv;
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mng_handle h_mng;
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mng_retcode mng_ret;
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sh_video_t * sh_video;
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// create private data structure
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mng_priv = calloc(1, sizeof(mng_priv_t));
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//stream pointer into private data
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mng_priv->stream = demuxer->stream;
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// initialize MNG image instance
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h_mng = mng_initialize((mng_ptr)mng_priv, demux_mng_alloc,
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demux_mng_free, MNG_NULL);
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if (!h_mng) {
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mp_msg(MSGT_DEMUX, MSGL_ERR,
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"demux_mng: could not initialize MNG image instance\n");
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free(mng_priv);
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return NULL;
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}
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// MNG image handle into private data
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mng_priv->h_mng = h_mng;
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// set required MNG callbacks
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if (mng_setcb_openstream(h_mng, demux_mng_openstream) ||
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mng_setcb_closestream(h_mng, demux_mng_closestream) ||
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mng_setcb_readdata(h_mng, demux_mng_readdata) ||
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mng_setcb_processheader(h_mng, demux_mng_processheader) ||
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mng_setcb_getcanvasline(h_mng, demux_mng_getcanvasline) ||
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mng_setcb_refresh(h_mng, demux_mng_refresh) ||
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mng_setcb_gettickcount(h_mng, demux_mng_gettickcount) ||
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mng_setcb_settimer(h_mng, demux_mng_settimer) ||
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mng_set_canvasstyle(h_mng, MNG_CANVAS_RGBA8)) {
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mp_msg(MSGT_DEMUX, MSGL_ERR,
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"demux_mng: could not set MNG callbacks\n");
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mng_cleanup(&h_mng);
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free(mng_priv);
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return NULL;
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}
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// start reading MNG data
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mng_ret = mng_read(h_mng);
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if (mng_ret) {
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mp_msg(MSGT_DEMUX, MSGL_ERR,
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"demux_mng: could not start reading MNG data: "
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"mng_retcode %d\n", mng_ret);
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mng_cleanup(&h_mng);
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free(mng_priv);
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return NULL;
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}
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// check that MNG header is processed now
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if (!mng_priv->header_processed) {
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mp_msg(MSGT_DEMUX, MSGL_ERR,
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"demux_mng: internal error: header not processed\n");
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mng_cleanup(&h_mng);
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free(mng_priv);
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return NULL;
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}
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// create a new video stream header
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sh_video = new_sh_video(demuxer, 0);
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// Make sure the demuxer knows about the new video stream header
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// (even though new_sh_video() ought to take care of it).
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// (Thanks to demux_gif.c for this.)
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demuxer->video->sh = sh_video;
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// Make sure that the video demuxer stream header knows about its
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// parent video demuxer stream (this is getting wacky), or else
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// video_read_properties() will choke.
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// (Thanks to demux_gif.c for this.)
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sh_video->ds = demuxer->video;
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// set format of pixels in video packets
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sh_video->format = mmioFOURCC(32, 'B', 'G', 'R');
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// set framerate to some value (MNG does not have a fixed framerate)
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sh_video->fps = 5.0f;
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sh_video->frametime = 1.0f / sh_video->fps;
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// set video frame parameters
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sh_video->bih = malloc(sizeof(*sh_video->bih));
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sh_video->bih->biCompression = sh_video->format;
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sh_video->bih->biWidth = mng_priv->width;
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sh_video->bih->biHeight = mng_priv->height;
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sh_video->bih->biBitCount = 32;
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sh_video->bih->biPlanes = 1;
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// Set start time to something > 0.
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// - This is required for the variable frame time mechanism
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// (GIF, MATROSKA, MNG) in video.c to work for the first frame.
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sh_video->ds->pts = MNG_START_PTS;
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// set private data in demuxer and return demuxer
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demuxer->priv = mng_priv;
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return demuxer;
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}
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/**
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* \brief MPlayer callback: Close MNG stream.
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* \param[in] demuxer demuxer structure
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*/
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static void demux_mng_close(demuxer_t* demuxer)
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{
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mng_priv_t * mng_priv = demuxer->priv;
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if (mng_priv) {
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// shutdown MNG image instance
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if (mng_priv->h_mng)
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mng_cleanup(&mng_priv->h_mng);
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// free private data
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free(mng_priv->canvas);
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free(mng_priv);
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}
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}
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/**
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* \brief MPlayer callback: Seek in MNG stream.
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* \param[in] demuxer demuxer structure
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* \param[in] rel_seek_secs relative seek time in seconds
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* \param[in] audio_delay unused, MNG does not contain audio
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* \param[in] flags bit flags, \p 1: absolute, \p 2: fractional position
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*/
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static void demux_mng_seek(demuxer_t * demuxer, float rel_seek_secs,
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float audio_delay, int flags)
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{
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mng_priv_t * mng_priv = demuxer->priv;
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mng_handle h_mng = mng_priv->h_mng;
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mng_retcode mng_ret;
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int seek_ms, pos_ms;
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// exit if not ready to seek (header not yet read or not yet displaying)
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if (!mng_priv->header_processed || !mng_priv->displaying)
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return;
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// get number of milliseconds to seek to
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if (flags & 2) // seek by fractional position (0.0 ... 1.0)
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seek_ms = (int)(rel_seek_secs * (float)mng_priv->total_time_ms);
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else // seek by time in seconds
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seek_ms = (int)(rel_seek_secs * 1000.0f + 0.5f);
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// get new position in milliseconds
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if (flags & 1) // absolute
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pos_ms = seek_ms;
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else // relative
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pos_ms = mng_priv->show_cur_time_ms + seek_ms;
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// fix position
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if (pos_ms < 0)
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pos_ms = 0;
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if (pos_ms > mng_priv->total_time_ms)
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pos_ms = mng_priv->total_time_ms;
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// FIXME
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// In principle there is a function to seek in MNG: mng_display_gotime().
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// - Using it did not work out (documentation is very brief,
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// example code does not exist?).
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// - The following code works, but its performance is quite bad.
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// seeking forward
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if (pos_ms >= mng_priv->show_cur_time_ms) {
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// Simply advance show time to seek position.
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// - Everything else will be handled in demux_mng_fill_buffer().
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mng_priv->show_next_time_ms = pos_ms;
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} // if (pos_ms > mng_priv->show_time_ms)
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// seeking backward
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else { // if (pos_ms > mng_priv->show_time_ms)
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// Clear variable MNG library will write number of milliseconds to
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// (via settimer callback).
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mng_priv->timer_ms = 0;
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// Restart displaying and advance show time to seek position.
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// - Everything else will be handled in demux_mng_fill_buffer().
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mng_ret = mng_display_reset(h_mng);
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// If a timer wait is needed, fool libmng that requested time
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// passed and try again.
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if (mng_ret == MNG_NEEDTIMERWAIT) {
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mng_priv->global_time_ms += mng_priv->timer_ms;
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mng_ret = mng_display_reset(h_mng);
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}
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if (mng_ret) {
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mp_msg(MSGT_DEMUX, MSGL_ERR,
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"demux_mng: could not reset MNG display state: "
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|
"mng_retcode %d\n", mng_ret);
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return;
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|
}
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|
mng_priv->displaying = 0;
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|
mng_priv->finished = 0;
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|
mng_priv->anim_cur_time_ms = 0;
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|
mng_priv->anim_frame_duration_ms = 0;
|
|
mng_priv->show_next_time_ms = pos_ms;
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|
|
} // if (pos_ms > mng_priv->show_time_ms) ... else
|
|
}
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|
|
|
/**
|
|
* \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;
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|
|
|
switch(cmd) {
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|
|
// 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;
|
|
|
|
// get position in movie
|
|
case DEMUXER_CTRL_GET_PERCENT_POS:
|
|
if (mng_priv->header_processed && mng_priv->total_time_ms > 0) {
|
|
*(int *)arg = (100 * mng_priv->show_cur_time_ms
|
|
+ mng_priv->total_time_ms / 2)
|
|
/ mng_priv->total_time_ms;
|
|
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
|
|
};
|