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For DVR-MS:

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extract timing information from the payload extension, set key frames,
detect video frame boundaries, interpolate the average video frame time
using the known informations from past frames and timestamps.
Video data before the first video key frame is thrown away.
Patch by John Donaghy johnfdonaghy gmail com



git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@23257 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
nicodvb 2007-05-07 21:58:42 +00:00
parent ee8969021b
commit e4d7bc4396
3 changed files with 277 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
libmpdemux/asf.h
View File

@ -219,11 +219,28 @@ struct asf_priv {
unsigned packetsize;
double packetrate;
unsigned movielength;
double avg_vid_frame_time;
int asf_is_dvr_ms;
uint32_t asf_frame_state;
int asf_frame_start_found;
double dvr_last_vid_pts;
uint64_t vid_frame_ct;
uint64_t play_duration;
uint64_t num_packets;
int new_vid_frame_seg;
int *vid_repdata_sizes;
int *aud_repdata_sizes;
int vid_repdata_count;
int aud_repdata_count;
uint64_t avg_vid_frame_time;
uint64_t last_key_payload_time;
uint64_t last_aud_pts;
uint64_t last_aud_diff;
int found_first_key_frame;
uint32_t last_vid_seq;
int vid_ext_timing_index;
int aud_ext_timing_index;
int vid_ext_frame_index;
int know_frame_time;
};
#endif

87
libmpdemux/asfheader.c
View File

@ -37,6 +37,8 @@
#define ASF_GUID_PREFIX_stream_group 0x7bf875ce
#define ASF_GUID_PREFIX_ext_audio_stream 0x31178C9D
#define ASF_GUID_PREFIX_ext_stream_embed_stream_header 0x3AFB65E2
#define ASF_GUID_PREFIX_dvr_ms_timing_rep_data 0xFD3CC02A
#define ASF_GUID_PREFIX_dvr_ms_vid_frame_rep_data 0xDD6432CC
/*
const char asf_audio_stream_guid[16] = {0x40, 0x9e, 0x69, 0xf8,
@ -64,6 +66,10 @@ const char asf_metadata_header[16] = {0xea, 0xcb, 0xf8, 0xc5,
0xaf, 0x5b, 0x77, 0x48, 0x84, 0x67, 0xaa, 0x8c, 0x44, 0xfa, 0x4c, 0xca};
const char asf_content_encryption[16] = {0xfb, 0xb3, 0x11, 0x22,
0x23, 0xbd, 0xd2, 0x11, 0xb4, 0xb7, 0x00, 0xa0, 0xc9, 0x55, 0xfc, 0x6e};
const char asf_dvr_ms_timing_rep_data[16] = {0x2a, 0xc0, 0x3c,0xfd,
0xdb, 0x06, 0xfa, 0x4c, 0x80, 0x1c, 0x72, 0x12, 0xd3, 0x87, 0x45, 0xe4};
const char asf_dvr_ms_vid_frame_rep_data[16] = {0xcc, 0x32, 0x64, 0xdd,
0x29, 0xe2, 0xdb, 0x40, 0x80, 0xf6, 0xd2, 0x63, 0x28, 0xd2, 0x76, 0x1f};
typedef struct {
// must be 0 for metadata record, might be non-zero for metadata lib record
@ -126,6 +132,10 @@ static const char* asf_chunk_type(unsigned char* guid) {
return "guid_file_header";
case ASF_GUID_PREFIX_content_desc:
return "guid_content_desc";
case ASF_GUID_PREFIX_dvr_ms_timing_rep_data:
return "guid_dvr_ms_timing_rep_data";
case ASF_GUID_PREFIX_dvr_ms_vid_frame_rep_data:
return "guid_dvr_ms_vid_frame_rep_data";
default:
strcpy(tmp, "unknown guid ");
p = tmp + strlen(tmp);
@ -183,16 +193,16 @@ static int find_backwards_asf_guid(char *buf, const char *guid, int cur_pos)
return -1;
}
static int get_ext_stream_properties(char *buf, int buf_len, int stream_num, double* avg_frame_time)
static int get_ext_stream_properties(char *buf, int buf_len, int stream_num, struct asf_priv* asf, int is_video)
{
// this function currently only gets the average frame time if available
int pos=0;
uint8_t *buffer = &buf[0];
uint64_t avg_ft;
while ((pos = find_asf_guid(buf, asf_ext_stream_header, pos, buf_len)) >= 0) {
int this_stream_num, stnamect, payct, i, objlen;
int buf_max_index=pos+50;
if (buf_max_index > buf_len) return 0;
buffer = &buf[pos];
// the following info is available
@ -207,13 +217,70 @@ static int get_ext_stream_properties(char *buf, int buf_len, int stream_num, dou
this_stream_num=AV_RL16(buffer);buffer+=2;
if (this_stream_num == stream_num) {
buf_max_index+=14;
if (buf_max_index > buf_len) return 0;
buffer+=2; //skip stream-language-id-index
avg_ft = AV_RL32(buffer) | (uint64_t)AV_RL32(buffer + 4) << 32; // provided in 100ns units
*avg_frame_time = avg_ft/10000000.0f;
buffer+=8;
// after this are values for stream-name-count and
// payload-extension-system-count
// followed by associated info for each
stnamect = AV_RL16(buffer);buffer+=2;
payct = AV_RL16(buffer);buffer+=2;
// need to read stream names if present in order
// to get lengths - values are ignored for now
for (i=0; i<stnamect; i++) {
int stream_name_len;
buf_max_index+=4;
if (buf_max_index > buf_len) return 0;
buffer+=2; //language_id_index
stream_name_len = AV_RL16(buffer);buffer+=2;
buffer+=stream_name_len; //stream_name
buf_max_index+=stream_name_len;
if (buf_max_index > buf_len) return 0;
}
if (is_video) {
asf->vid_repdata_count = payct;
asf->vid_repdata_sizes = malloc(payct*sizeof(int));
} else {
asf->aud_repdata_count = payct;
asf->aud_repdata_sizes = malloc(payct*sizeof(int));
}
for (i=0; i<payct; i++) {
int payload_len;
buf_max_index+=22;
if (buf_max_index > buf_len) return 0;
// Each payload extension definition starts with a GUID.
// In dvr-ms files one of these indicates the presence an
// extension that contains pts values and this is always present
// in the video and audio streams.
// Another GUID indicates the presence of an extension
// that contains useful video frame demuxing information.
// Note that the extension data in each packet does not contain
// these GUIDs and that this header section defines the order the data
// will appear in.
if (memcmp(buffer, asf_dvr_ms_timing_rep_data, 16) == 0) {
if (is_video)
asf->vid_ext_timing_index = i;
else
asf->aud_ext_timing_index = i;
} else if (is_video && memcmp(buffer, asf_dvr_ms_vid_frame_rep_data, 16) == 0)
asf->vid_ext_frame_index = i;
buffer+=16;
payload_len = AV_RL16(buffer);buffer+=2;
if (is_video)
asf->vid_repdata_sizes[i] = payload_len;
else
asf->aud_repdata_sizes[i] = payload_len;
buffer+=4;//sys_len
}
return 1;
}
}
@ -421,6 +488,8 @@ int read_asf_header(demuxer_t *demuxer,struct asf_priv* asf){
++audio_streams;
if (!asf_init_audio_stream(demuxer, asf, sh_audio, streamh, &audio_pos, &buffer, hdr, hdr_len))
goto len_err_out;
if (!get_ext_stream_properties(hdr, hdr_len, streamh->stream_no, asf, 0))
goto len_err_out;
}
}
// find stream headers
@ -481,14 +550,8 @@ int read_asf_header(demuxer_t *demuxer,struct asf_priv* asf){
asf->asf_is_dvr_ms=1;
asf->dvr_last_vid_pts=0.0;
} else asf->asf_is_dvr_ms=0;
if (get_ext_stream_properties(hdr, hdr_len, streamh->stream_no, &asf->avg_vid_frame_time)) {
sh_video->frametime=(float)asf->avg_vid_frame_time;
sh_video->fps=1.0f/sh_video->frametime;
} else {
asf->avg_vid_frame_time=0.0; // only used for dvr-ms when > 0.0
sh_video->fps=1000.0f;
sh_video->frametime=0.001f;
}
if (!get_ext_stream_properties(hdr, hdr_len, streamh->stream_no, asf, 1))
goto len_err_out;
if (get_meta(hdr, hdr_len, streamh->stream_no, &asp_ratio)) {
sh_video->aspect = asp_ratio * sh_video->bih->biWidth /
sh_video->bih->biHeight;

208
libmpdemux/demux_asf.c
View File

@ -66,6 +66,17 @@ static void asf_descrambling(unsigned char **src,unsigned len, struct asf_priv*
*src = dst;
}
/*****************************************************************
* \brief initializes asf private data
*
*/
static void init_priv (struct asf_priv* asf){
asf->last_vid_seq=-1;
asf->vid_ext_timing_index=-1;
asf->aud_ext_timing_index=-1;
asf->vid_ext_frame_index=-1;
}
#ifdef USE_LIBAVCODEC_SO
#include <ffmpeg/avcodec.h>
#elif defined(USE_LIBAVCODEC)
@ -149,11 +160,10 @@ static void demux_asf_append_to_packet(demux_packet_t* dp,unsigned char *data,in
dp->len+=len;
}
static int demux_asf_read_packet(demuxer_t *demux,unsigned char *data,int len,int id,int seq,unsigned long time,unsigned short dur,int offs,int keyframe){
static int demux_asf_read_packet(demuxer_t *demux,unsigned char *data,int len,int id,int seq,uint64_t time,unsigned short dur,int offs,int keyframe){
struct asf_priv* asf = demux->priv;
demux_stream_t *ds=NULL;
int close_seg=0;
int frame_end_pos=END_NOT_FOUND;
mp_dbg(MSGT_DEMUX,MSGL_DBG4,"demux_asf.read_packet: id=%d seq=%d len=%d\n",id,seq,len);
@ -187,25 +197,9 @@ static int demux_asf_read_packet(demuxer_t *demux,unsigned char *data,int len,in
demux_packet_t* dp=ds->asf_packet;
if (ds==demux->video && asf->asf_is_dvr_ms) {
frame_end_pos=mpeg1_find_frame_end(demux, data, len);
if (frame_end_pos != END_NOT_FOUND) {
if (asf->new_vid_frame_seg) {
dp->pos=demux->filepos;
if (frame_end_pos > 0) {
demux_asf_append_to_packet(dp,data,frame_end_pos,offs);
data += frame_end_pos;
len -= frame_end_pos;
}
close_seg = 1;
if (asf->avg_vid_frame_time > 0.0 ) {
// correct the pts for the packet
// because dvr-ms files do not contain accurate
// pts values but we can deduce them using
// the average frame time
if (asf->dvr_last_vid_pts > 0.0)
dp->pts=asf->dvr_last_vid_pts+asf->avg_vid_frame_time;
asf->dvr_last_vid_pts = dp->pts;
}
} else seq = ds->asf_seq;
} else close_seg = ds->asf_seq!=seq;
@ -231,7 +225,10 @@ static int demux_asf_read_packet(demuxer_t *demux,unsigned char *data,int len,in
}
dp=new_demux_packet(len);
memcpy(dp->buffer,data,len);
dp->pts=time*0.001f;
if (asf->asf_is_dvr_ms)
dp->pts=time*0.0000001f;
else
dp->pts=time*0.001f;
dp->flags=keyframe;
// if(ds==demux->video) printf("ASF time: %8d dur: %5d \n",time,dur);
dp->pos=demux->filepos;
@ -245,6 +242,151 @@ static int demux_asf_read_packet(demuxer_t *demux,unsigned char *data,int len,in
return 0;
}
/*****************************************************************
* \brief read the replicated data associated with each segment
* \parameter pp reference to replicated data
* \parameter id stream number
* \parameter seq media object number
* \parameter keyframe key frame indicator - set to zero if keyframe, non-zero otherwise
* \parameter seg_time set to payload time when valid, if audio or new video frame payload, zero otherwise
*
*/
static void get_payload_extension_data(demuxer_t *demux, unsigned char** pp, unsigned char id, unsigned int seq, int *keyframe, uint64_t *seg_time){
struct asf_priv* asf = demux->priv;
uint64_t payload_time; //100ns units
int i, ext_max, ext_timing_index;
uint8_t *pi = *pp+4;
if(demux->video->id==-1)
if(demux->v_streams[id])
demux->video->id=id;
if(demux->audio->id==-1)
if(demux->a_streams[id])
demux->audio->id=id;
if (id!=demux->video->id && id!=demux->audio->id) return;
if (id==demux->video->id) {
ext_max = asf->vid_repdata_count;
ext_timing_index = asf->vid_ext_timing_index;
} else {
ext_max = asf->aud_repdata_count;
ext_timing_index = asf->aud_ext_timing_index;
}
*seg_time=0.0;
asf->new_vid_frame_seg = 0;
for (i=0; i<ext_max; i++) {
uint16_t payextsize;
uint8_t segment_marker;
if (id==demux->video->id)
payextsize = asf->vid_repdata_sizes[i];
else
payextsize = asf->aud_repdata_sizes[i];
if (payextsize == 65535) {
payextsize = LOAD_LE16(pi);
pi+=2;
}
// if this is the timing info extension then read the payload time
if (i == ext_timing_index)
payload_time = (uint64_t) LOAD_LE32(pi+8) | (uint64_t)LOAD_LE32(pi+8 + 4) << 32;
// if this is the video frame info extension then
// set the keyframe indicator, the 'new frame segment' indicator
// and (initially) the 'frame time'
if (i == asf->vid_ext_frame_index && id==demux->video->id) {
segment_marker = pi[0];
// Known video stream segment_marker values that
// contain useful information:
//
// NTSC/ATSC (29.97fps): 0X4A 01001010
// 0X4B 01001011
// 0X49 01001001
//
// PAL/ATSC (25fps): 0X3A 00111010
// 0X3B 00111011
// 0X39 00111001
//
// ATSC progressive (29.97fps): 0X7A 01111010
// 0X7B 01111011
// 0X79 01111001
// 11111111
// ^ this is new video frame marker
//
// ^^^^ these bits indicate the framerate
// 0X4 is 29.97i, 0X3 is 25i, 0X7 is 29.97p, ???=25p
//
// ^^^ these bits indicate the frame type:
// 001 means I-frame
// 010 and 011 probably mean P and B
asf->new_vid_frame_seg = (0X08 & segment_marker) && seq != asf->last_vid_seq;
if (asf->new_vid_frame_seg) asf->last_vid_seq = seq;
if (asf->avg_vid_frame_time == 0) {
// set the average frame time initially (in 100ns units).
// This is based on what works for known samples.
// It can be extended if more samples of different types can be obtained.
if (((segment_marker & 0XF0) >> 4) == 4) {
asf->avg_vid_frame_time = (uint64_t)((1.001 / 30.0) * 10000000.0);
asf->know_frame_time=1;
} else if (((segment_marker & 0XF0) >> 4) == 3) {
asf->avg_vid_frame_time = (uint64_t)(0.04 * 10000000.0);
asf->know_frame_time=1;
} else if (((segment_marker & 0XF0) >> 4) == 6) {
asf->avg_vid_frame_time = (uint64_t)(0.02 * 10000000.0);
asf->know_frame_time=1;
} else if (((segment_marker & 0XF0) >> 4) == 7) {
asf->avg_vid_frame_time = (uint64_t)((1.001 / 60.0) * 10000000.0);
asf->know_frame_time=1;
} else {
// we dont know the frame time initially so
// make a guess and then recalculate as we go.
asf->avg_vid_frame_time = (uint64_t)((1.001 / 60.0) * 10000000.0);
asf->know_frame_time=0;
}
}
*keyframe = (asf->new_vid_frame_seg && (segment_marker & 0X07) == 1);
}
pi +=payextsize;
}
if (id==demux->video->id && asf->new_vid_frame_seg) {
asf->vid_frame_ct++;
// Some samples only have timings on key frames and
// the rest contain non-cronological timestamps. Interpolating
// the values between key frames works for all samples.
if (*keyframe) {
asf->found_first_key_frame=1;
if (!asf->know_frame_time && asf->last_key_payload_time > 0) {
// We dont know average frametime so recalculate.
// Giving precedence to the 'weight' of the existing
// average limits damage done to new value when there is
// a sudden time jump which happens occasionally.
asf->avg_vid_frame_time =
(0.9 * asf->avg_vid_frame_time) +
(0.1 * ((payload_time - asf->last_key_payload_time) / asf->vid_frame_ct));
}
asf->last_key_payload_time = payload_time;
asf->vid_frame_ct = 1;
*seg_time = payload_time;
} else
*seg_time = (asf->last_key_payload_time + (asf->avg_vid_frame_time * (asf->vid_frame_ct-1)));
}
if (id==demux->audio->id) {
if (payload_time != -1)
asf->last_aud_diff = payload_time - asf->last_aud_pts;
asf->last_aud_pts += asf->last_aud_diff;
*seg_time = asf->last_aud_pts;
}
}
//static int num_elementary_packets100=0;
//static int num_elementary_packets101=0;
@ -357,7 +499,7 @@ static int demux_asf_fill_buffer(demuxer_t *demux, demux_stream_t *ds){
unsigned int rlen;
//
int len;
unsigned int time2=0;
uint64_t time2=0;
int keyframe=0;
if(p>=p_end) {
@ -411,6 +553,8 @@ static int demux_asf_fill_buffer(demuxer_t *demux, demux_stream_t *ds){
if(rlen>=8){
p+=4; // skip object size
time2=LOAD_LE32(p); // read PTS
if (asf->asf_is_dvr_ms)
get_payload_extension_data(demux, &p, streamno, seq, &keyframe, &time2);
p+=rlen-4;
} else {
mp_msg(MSGT_DEMUX,MSGL_V,"unknown segment type (rlen): 0x%02X \n",rlen);
@ -457,7 +601,8 @@ static int demux_asf_fill_buffer(demuxer_t *demux, demux_stream_t *ds){
default:
// NO GROUPING:
//printf("fragment offset: %d \n",sh->x);
demux_asf_read_packet(demux,p,len,streamno,seq,time2,duration,x,keyframe);
if (!asf->asf_is_dvr_ms || asf->found_first_key_frame)
demux_asf_read_packet(demux,p,len,streamno,seq,time2,duration,x,keyframe);
p+=len;
break;
}
@ -555,6 +700,7 @@ static demuxer_t* demux_open_asf(demuxer_t* demuxer)
//---- ASF header:
if(!asf) return NULL;
init_priv(asf);
if (!read_asf_header(demuxer,asf)) {
free(asf);
return NULL;
@ -570,7 +716,7 @@ static demuxer_t* demux_open_asf(demuxer_t* demuxer)
//printf("ASF: missing video stream!? contact the author, it may be a bug :(\n");
} else {
sh_video=demuxer->video->sh;sh_video->ds=demuxer->video;
//sh_video->fps=1000.0f; sh_video->frametime=0.001f; // 1ms - now set when reading asf header
sh_video->fps=1000.0f; sh_video->frametime=0.001f;
//sh_video->i_bps=10*asf->packetsize; // FIXME!
if (asf->asf_is_dvr_ms) {
@ -597,6 +743,20 @@ static demuxer_t* demux_open_asf(demuxer_t* demuxer)
}
static void demux_close_asf(demuxer_t *demuxer) {
struct asf_priv* asf = demuxer->priv;
if (!asf) return;
if (asf->aud_repdata_sizes)
free(asf->aud_repdata_sizes);
if (asf->vid_repdata_sizes)
free(asf->vid_repdata_sizes);
free(asf);
}
demuxer_desc_t demuxer_desc_asf = {
"ASF demuxer",
"asf",
@ -608,7 +768,7 @@ demuxer_desc_t demuxer_desc_asf = {
asf_check_header,
demux_asf_fill_buffer,
demux_open_asf,
NULL, //demux_close_asf,
demux_close_asf,
demux_seek_asf,
demux_asf_control
};