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mpv/libmpdemux/demux_lmlm4.c

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/*
LMLM4 MPEG4 Compression Card stream & file parser by Maxim Yevtyushkin <max@linuxmedialabs.com>
Based on SMJPEG file parser by Alex Beregszaszi
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h> /* strtok */
#include "config.h"
#include "mp_msg.h"
#include "help_mp.h"
#include "stream.h"
#include "demuxer.h"
#include "stheader.h"
#include "bswap.h"
typedef struct __FrameInfo
{
ssize_t frameSize;
ssize_t paddingSize;
int frameType;
int channelNo;
} FrameInfo;
#define FRAMETYPE_I 0
#define FRAMETYPE_P 1
#define FRAMETYPE_B 2
#define FRAMETYPE_AUDIO_MPEG1L2 4
#define FRAMETYPE_AUDIO_ULAW 5
#define FRAMETYPE_AUDIO_ADPCM 6
#define PACKET_BLOCK_SIZE 0x00000200
#define PACKET_BLOCK_LAST 0x000001FF
#define PACKET_BLOCK_MASK 0xFFFFFE00
#define MAX_PACKET_SIZE 1048576 // 1 Mb
#define STREAM_START_CODE_SIZE 4
/*
// codes in MSB first
static unsigned int start_code [] =
{
0xB0010000, // VISUAL_OBJECT_SEQUENCE_START_CODE
0xB6010000, // VOP_START_CODE
0x04C4FDFF, // MPEG1LAYERII_START_CODE
0x00000000 // end of start codes list
};
*/
static int imeHeaderValid(FrameInfo *frame)
{
if ( frame->channelNo > 7 ||
frame->frameSize > MAX_PACKET_SIZE || frame->frameSize <= 0)
{
mp_msg(MSGT_DEMUX, MSGL_V, "Invalid packet in LMLM4 stream: ch=%d size=%d\n", frame->channelNo, frame->frameSize);
return 0;
}
switch (frame->frameType) {
case FRAMETYPE_I:
case FRAMETYPE_P:
case FRAMETYPE_B:
case FRAMETYPE_AUDIO_MPEG1L2:
case FRAMETYPE_AUDIO_ULAW:
case FRAMETYPE_AUDIO_ADPCM:
break;
default:
mp_msg(MSGT_DEMUX, MSGL_V, "Invalid packet in LMLM4 stream (wrong packet type %d)\n", frame->frameType);
return 0;
}
return 1;
}
/*
int searchMPEG4Stream(demuxer_t* demuxer, IME6400Header *imeHeader)
{
void *data;
ssize_t imeHeaderSize = sizeof(IME6400Header);
ssize_t dataSize = sizeof(IME6400Header) * 3;
ssize_t ptr = imeHeaderSize * 2;
int errNo, startCodeNo;
off_t pos;
data = malloc(dataSize);
imeHeaderSwap(imeHeader);
memcpy(data + imeHeaderSize, imeHeader, imeHeaderSize);
// printHex(data + imeHeaderSize, imeHeaderSize);
while ((errNo = stream_read(demuxer->stream, data + imeHeaderSize * 2 , imeHeaderSize)) == imeHeaderSize)
{
// printHex(data + imeHeaderSize * 2, imeHeaderSize);
pos = stream_tell(demuxer->stream);
while (dataSize - ptr >= STREAM_START_CODE_SIZE) {
startCodeNo = 0;
while (start_code[startCodeNo])
{
if (memcmp(&start_code[startCodeNo], data + ptr, STREAM_START_CODE_SIZE) == 0) // start code match
{
memcpy(imeHeader, data + ptr - imeHeaderSize, imeHeaderSize);
imeHeaderSwap(imeHeader);
if (imeHeaderValid(imeHeader))
{
stream_seek(demuxer->stream, pos - (dataSize - ptr));
free(data);
return 0;
}
}
startCodeNo++;
}
ptr++;
}
memcpy(data,data + imeHeaderSize, imeHeaderSize * 2);
ptr -= imeHeaderSize;
}
free(data);
return errNo;
}
*/
static int getFrame(demuxer_t *demuxer, FrameInfo *frameInfo)
{
int retCode;
unsigned int packetSize;
frameInfo->channelNo = stream_read_word(demuxer->stream);
frameInfo->frameType = stream_read_word(demuxer->stream);
packetSize=stream_read_dword(demuxer->stream);
if(stream_eof(demuxer->stream)){
frameInfo->frameSize = 0;
return 0;
}
frameInfo->frameSize = packetSize - 8; //sizeof(IME6400Header);
frameInfo->paddingSize = (packetSize & PACKET_BLOCK_LAST) ? PACKET_BLOCK_SIZE - (packetSize & PACKET_BLOCK_LAST) : 0;
mp_msg(MSGT_DEMUX, MSGL_DBG2, "typ: %d chan: %d size: %d pad: %d\n",
frameInfo->frameType,
frameInfo->channelNo,
frameInfo->frameSize,
frameInfo->paddingSize);
if(!imeHeaderValid(frameInfo)){
// skip this packet
stream_skip(demuxer->stream,PACKET_BLOCK_SIZE-8);
frameInfo->frameSize = 0;
return -1;
}
return 1;
}
int lmlm4_check_file(demuxer_t* demuxer)
{
FrameInfo frameInfo;
unsigned int first;
mp_msg(MSGT_DEMUX, MSGL_V, "Checking for LMLM4 Stream Format\n");
if(getFrame(demuxer, &frameInfo)!=1){
stream_skip(demuxer->stream,-8);
mp_msg(MSGT_DEMUX, MSGL_V, "LMLM4 Stream Format not found\n");
return 0;
}
first=stream_read_dword(demuxer->stream);
stream_skip(demuxer->stream,-12);
mp_msg(MSGT_DEMUXER,MSGL_V,"LMLM4: first=0x%08X\n",first);
switch(frameInfo.frameType){
case FRAMETYPE_AUDIO_MPEG1L2:
if( (first & 0xffe00000) != 0xffe00000 ){
mp_msg(MSGT_DEMUXER,MSGL_V,"LMLM4: not mpeg audio\n");
return 0;
}
if((4-((first>>17)&3))!=2){
mp_msg(MSGT_DEMUXER,MSGL_V,"LMLM4: not layer-2\n");
return 0;
}
if(((first>>10)&0x3)==3){
mp_msg(MSGT_DEMUXER,MSGL_V,"LMLM4: invalid audio sampelrate\n");
return 0;
}
mp_msg(MSGT_DEMUXER,MSGL_V,"LMLM4: first packet is audio, header checks OK!\n");
break;
// TODO: add checks for video header too, for case of disabled audio
}
// stream_reset(demuxer->stream);
mp_msg(MSGT_DEMUX, MSGL_V, "LMLM4 Stream Format found\n");
return 1;
}
static int video = 0;
static int frames= 0;
// return value:
// 0 = EOF or no stream found
// 1 = successfully read a packet
int demux_lmlm4_fill_buffer(demuxer_t *demux)
{
FrameInfo frameInfo;
double pts;
int id=1;
int ret;
hdr:
demux->filepos = stream_tell(demux->stream);
mp_msg(MSGT_DEMUX, MSGL_DBG2, "fpos = %d\n", demux->filepos);
ret=getFrame(demux, &frameInfo);
if(ret<=0) return ret; // EOF/error
pts=demux->video->sh ? frames*((sh_video_t*)(demux->video->sh))->frametime : 0;
switch(frameInfo.frameType){
case FRAMETYPE_AUDIO_MPEG1L2:
mp_dbg(MSGT_DEMUX, MSGL_DBG2, "Audio Packet\n");
if (!video)
{
stream_skip(demux->stream, frameInfo.frameSize + frameInfo.paddingSize);
mp_msg(MSGT_DEMUX, MSGL_V, "Skip Audio Packet\n");
return -1; //goto hdr;
}
if(demux->audio->id==-1){
if(!demux->a_streams[id]) new_sh_audio(demux,id);
demux->audio->id=id;
demux->audio->sh=demux->a_streams[id];
((sh_audio_t*)(demux->audio->sh))->format=0x50; // mpeg audio layer 1/2
}
if(demux->audio->id==id)
ds_read_packet(demux->audio, demux->stream, frameInfo.frameSize,
pts, demux->filepos, 0);
else
stream_skip(demux->stream,frameInfo.frameSize);
break;
case FRAMETYPE_I:
if (!video) {
video = 1;
mp_dbg(MSGT_DEMUX, MSGL_DBG2, "First Video Packet\n");
}
case FRAMETYPE_P:
frames=(frames+1)&(1024*1024-1); // wrap around at 4 hrs to avoid inaccurate float calculations
if (!video)
{
stream_skip(demux->stream, frameInfo.frameSize + frameInfo.paddingSize);
mp_msg(MSGT_DEMUX, MSGL_V, "Skip Video P Packet\n");
return -1; //goto hdr;
}
mp_dbg(MSGT_DEMUX, MSGL_DBG2, "Video Packet\n");
if(demux->video->id==-1){
if(!demux->v_streams[id]) new_sh_video(demux,id);
demux->video->id=id;
demux->video->sh=demux->v_streams[id];
((sh_video_t*)(demux->video->sh))->format=0x10000004; // mpeg4-ES
}
if(demux->video->id==id)
ds_read_packet(demux->video, demux->stream, frameInfo.frameSize,
pts, demux->filepos, 0);
break;
default:
stream_skip(demux->stream,frameInfo.frameSize);
}
stream_skip(demux->stream, frameInfo.paddingSize);
return 1;
}
int demux_open_lmlm4(demuxer_t* demuxer){
#if 0
sh_video_t* sh_video;
sh_audio_t* sh_audio;
unsigned int htype = 0, hleng;
int i = 0;
sh_video = new_sh_video(demuxer, 0);
demuxer->video->sh = sh_video;
sh_video->ds = demuxer->video;
sh_video->disp_w = 640;
sh_video->disp_h = 480;
sh_video->format = mmioFOURCC('D','I','V','X');
sh_video->bih = malloc(sizeof(BITMAPINFOHEADER));
memset(sh_video->bih, 0, sizeof(BITMAPINFOHEADER));
/* these are false values */
sh_video->bih->biSize = 40;
sh_video->bih->biWidth = sh_video->disp_w;
sh_video->bih->biHeight = sh_video->disp_h;
sh_video->bih->biPlanes = 3;
sh_video->bih->biBitCount = 16;
sh_video->bih->biCompression = sh_video->format;
sh_video->bih->biSizeImage = sh_video->disp_w*sh_video->disp_h;
sh_audio = new_sh_audio(demuxer, 0);
demuxer->audio->sh = sh_audio;
sh_audio->ds = demuxer->audio;
sh_audio->wf = malloc(sizeof(WAVEFORMATEX));
memset(sh_audio->wf, 0, sizeof(WAVEFORMATEX));
sh_audio->samplerate = 48000;
sh_audio->wf->wBitsPerSample = 16;
sh_audio->channels = 2;
sh_audio->format = 0x50;
sh_audio->wf->wFormatTag = sh_audio->format;
sh_audio->wf->nChannels = sh_audio->channels;
sh_audio->wf->nSamplesPerSec = sh_audio->samplerate;
sh_audio->wf->nAvgBytesPerSec = sh_audio->wf->nChannels*
sh_audio->wf->wBitsPerSample*sh_audio->wf->nSamplesPerSec/8;
sh_audio->wf->nBlockAlign = sh_audio->channels *2;
sh_audio->wf->cbSize = 0;
#endif
demuxer->seekable = 0;
return 1;
}
void demux_close_lmlm4(demuxer_t *demuxer)
{
// printf("Close LMLM4 Stream\n");
return;
}
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