mirror of
https://github.com/mpv-player/mpv
synced 2024-12-09 08:29:42 +00:00
201 lines
5.5 KiB
C
201 lines
5.5 KiB
C
/*
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* SMJPEG file parser
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* copyright (c) 2002 Alex Beregszaszi
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* based on text by Arpi (SMJPEG-format.txt) and later on
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* http://www.lokigames.com/development/download/smjpeg/SMJPEG.txt
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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 <string.h> /* strtok */
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#include "config.h"
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#include "mp_msg.h"
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#include "libavutil/attributes.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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static int smjpeg_check_file(demuxer_t* demuxer){
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int orig_pos = stream_tell(demuxer->stream);
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char buf[8];
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int version;
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mp_msg(MSGT_DEMUX, MSGL_V, "Checking for SMJPEG\n");
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if (stream_read_word(demuxer->stream) == 0xA)
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{
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stream_read(demuxer->stream, buf, 6);
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buf[7] = 0;
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if (strncmp("SMJPEG", buf, 6)) {
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mp_msg(MSGT_DEMUX, MSGL_DBG2, "Failed: SMJPEG\n");
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return 0;
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}
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}
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else
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return 0;
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version = stream_read_dword(demuxer->stream);
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if (version != 0)
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{
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mp_msg(MSGT_DEMUX, MSGL_ERR, "Unknown version (%d) of SMJPEG. Please report!\n",
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version);
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return 0;
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}
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stream_seek(demuxer->stream, orig_pos);
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return DEMUXER_TYPE_SMJPEG;
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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_smjpeg_fill_buffer(demuxer_t *demux, demux_stream_t *ds)
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{
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int dtype, dsize, dpts;
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demux->filepos = stream_tell(demux->stream);
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dtype = stream_read_dword_le(demux->stream);
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dpts = stream_read_dword(demux->stream);
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dsize = stream_read_dword(demux->stream);
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switch(dtype)
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{
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case mmioFOURCC('s','n','d','D'):
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/* fixme, but no decoder implemented yet */
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ds_read_packet(demux->audio, demux->stream, dsize,
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(float)dpts/1000.0, demux->filepos, 0);
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break;
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case mmioFOURCC('v','i','d','D'):
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ds_read_packet(demux->video, demux->stream, dsize,
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(float)dpts/1000.0, demux->filepos, 0);
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break;
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case mmioFOURCC('D','O','N','E'):
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return 1;
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default:
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return 0;
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}
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return 1;
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}
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static demuxer_t* demux_open_smjpeg(demuxer_t* demuxer){
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sh_video_t* sh_video;
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sh_audio_t* sh_audio;
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unsigned int htype = 0, hleng av_unused;
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int i = 0;
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/* file header */
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stream_skip(demuxer->stream, 8); /* \x00\x0aSMJPEG */
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stream_skip(demuxer->stream, 4);
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mp_msg(MSGT_DEMUX, MSGL_INFO, "This clip is %d seconds\n",
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stream_read_dword(demuxer->stream));
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/* stream header */
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while (i < 3)
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{
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i++;
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htype = stream_read_dword_le(demuxer->stream);
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if (htype == mmioFOURCC('H','E','N','D'))
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break;
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hleng = (stream_read_word(demuxer->stream)<<16)|stream_read_word(demuxer->stream);
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switch(htype)
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{
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case mmioFOURCC('_','V','I','D'):
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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->bih = calloc(1, sizeof(*sh_video->bih));
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stream_skip(demuxer->stream, 4); /* number of frames */
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// sh_video->fps = 24;
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// sh_video->frametime = 1.0f/sh_video->fps;
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sh_video->disp_w = stream_read_word(demuxer->stream);
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sh_video->disp_h = stream_read_word(demuxer->stream);
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sh_video->format = stream_read_dword_le(demuxer->stream);
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/* these are false values */
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sh_video->bih->biSize = 40;
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sh_video->bih->biWidth = sh_video->disp_w;
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sh_video->bih->biHeight = sh_video->disp_h;
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sh_video->bih->biPlanes = 3;
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sh_video->bih->biBitCount = 12;
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sh_video->bih->biCompression = sh_video->format;
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sh_video->bih->biSizeImage = sh_video->disp_w*sh_video->disp_h;
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break;
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case mmioFOURCC('_','S','N','D'):
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sh_audio = new_sh_audio(demuxer, 0);
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demuxer->audio->id = 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 = calloc(1, sizeof(*sh_audio->wf));
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sh_audio->samplerate = stream_read_word(demuxer->stream);
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sh_audio->wf->wBitsPerSample = stream_read_char(demuxer->stream);
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sh_audio->channels = stream_read_char(demuxer->stream);
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sh_audio->format = stream_read_dword_le(demuxer->stream);
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sh_audio->wf->wFormatTag = sh_audio->format;
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sh_audio->wf->nChannels = sh_audio->channels;
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sh_audio->wf->nSamplesPerSec = sh_audio->samplerate;
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sh_audio->wf->nAvgBytesPerSec = sh_audio->wf->nChannels*
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sh_audio->wf->wBitsPerSample*sh_audio->wf->nSamplesPerSec/8;
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sh_audio->wf->nBlockAlign = sh_audio->channels *2;
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sh_audio->wf->cbSize = 0;
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break;
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case mmioFOURCC('_','T','X','T'):
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stream_skip(demuxer->stream, stream_read_dword(demuxer->stream));
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break;
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}
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}
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demuxer->seekable = 0;
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return demuxer;
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}
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static void demux_close_smjpeg(demuxer_t *demuxer)
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{
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return;
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}
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const demuxer_desc_t demuxer_desc_smjpeg = {
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"smjpeg demuxer",
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"smjpeg",
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"SMJPEG",
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"Alex Beregszasi",
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"",
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DEMUXER_TYPE_SMJPEG,
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1, // safe autodetect
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smjpeg_check_file,
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demux_smjpeg_fill_buffer,
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demux_open_smjpeg,
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demux_close_smjpeg,
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NULL,
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NULL
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};
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