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* ASF file parser for DEMUXER v0.3
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* copyright (c) 2001 A'rpi/ESP-team
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* This file is part of MPlayer.
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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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* 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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* 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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#include "stream/stream.h"
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#include "asfheader.h"
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#include "libmpcodecs/dec_audio.h"
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#include "libvo/fastmemcpy.h"
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#include "libavutil/intreadwrite.h"
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// based on asf file-format doc by Eugene [http://divx.euro.ru]
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* \brief reads int stored in number of bytes given by len
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* \param ptr pointer to read from, is incremented appropriately
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* \param len lowest 2 bits indicate number of bytes to read
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* \param def default value to return if len is invalid
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static inline unsigned read_varlen(uint8_t **ptr, int len, int def) {
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const uint8_t *p = *ptr;
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case 1: *ptr += 1; return *p;
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case 2: *ptr += 2; return AV_RL16(p);
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case 3: *ptr += 4; return AV_RL32(p);
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* \brief checks if there is enough data to read the bytes given by len
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* \param ptr pointer to read from
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* \param endptr pointer to the end of the buffer
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* \param len lowest 2 bits indicate number of bytes to read
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static inline int check_varlen(uint8_t *ptr, uint8_t *endptr, int len) {
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return len&3 ? ptr + (1<<((len&3) - 1)) <= endptr : 1;
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static void asf_descrambling(unsigned char **src,unsigned len, struct asf_priv* asf){
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unsigned char *s2=*src;
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if (len > UINT_MAX - MP_INPUT_BUFFER_PADDING_SIZE)
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dst = malloc(len + MP_INPUT_BUFFER_PADDING_SIZE);
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while(len>=asf->scrambling_h*asf->scrambling_w*asf->scrambling_b+i){
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// mp_msg(MSGT_DEMUX,MSGL_DBG4,"descrambling! (w=%d b=%d)\n",w,asf_scrambling_b);
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//i+=asf_scrambling_h*asf_scrambling_w;
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for(x=0;x<asf->scrambling_w;x++)
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for(y=0;y<asf->scrambling_h;y++){
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fast_memcpy(dst+i,s2+(y*asf->scrambling_w+x)*asf->scrambling_b,asf->scrambling_b);
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s2+=asf->scrambling_h*asf->scrambling_w*asf->scrambling_b;
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//if(i<len) fast_memcpy(dst+i,src+i,len-i);
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/*****************************************************************
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* \brief initializes asf private data
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static void init_priv (struct asf_priv* asf){
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asf->vid_ext_timing_index=-1;
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asf->aud_ext_timing_index=-1;
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asf->vid_ext_frame_index=-1;
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static void demux_asf_append_to_packet(demux_packet_t* dp,unsigned char *data,int len,int offs)
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if(dp->len!=offs && offs!=-1) mp_msg(MSGT_DEMUX,MSGL_V,"warning! fragment.len=%d BUT next fragment offset=%d \n",dp->len,offs);
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dp->buffer=realloc(dp->buffer,dp->len+len+MP_INPUT_BUFFER_PADDING_SIZE);
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fast_memcpy(dp->buffer+dp->len,data,len);
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memset(dp->buffer+dp->len+len, 0, MP_INPUT_BUFFER_PADDING_SIZE);
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mp_dbg(MSGT_DEMUX,MSGL_DBG4,"data appended! %d+%d\n",dp->len,len);
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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){
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struct asf_priv* asf = demux->priv;
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demux_stream_t *ds=NULL;
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mp_dbg(MSGT_DEMUX,MSGL_DBG4,"demux_asf.read_packet: id=%d seq=%d len=%d\n",id,seq,len);
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if(demux->video->id==-1)
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if(demux->v_streams[id])
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if(demux->audio->id==-1)
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if(demux->a_streams[id])
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if(id==demux->audio->id){
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ds->sh=demux->a_streams[id];
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mp_msg(MSGT_DEMUX,MSGL_V,"Auto-selected ASF audio ID = %d\n",ds->id);
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if(id==demux->video->id){
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ds->sh=demux->v_streams[id];
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mp_msg(MSGT_DEMUX,MSGL_V,"Auto-selected ASF video ID = %d\n",ds->id);
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demux_packet_t* dp=ds->asf_packet;
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if (ds==demux->video && asf->asf_is_dvr_ms) {
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if (asf->new_vid_frame_seg) {
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dp->pos=demux->filepos;
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} else seq = ds->asf_seq;
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} else close_seg = ds->asf_seq!=seq;
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// closed segment, finalize packet:
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if(asf->scrambling_h>1 && asf->scrambling_w>1 && asf->scrambling_b>0)
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asf_descrambling(&ds->asf_packet->buffer,ds->asf_packet->len,asf);
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ds_add_packet(ds,ds->asf_packet);
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// append data to it!
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demux_asf_append_to_packet(dp,data,len,offs);
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// create new packet:
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{ demux_packet_t* dp;
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mp_msg(MSGT_DEMUX,MSGL_V,"warning! broken fragment, %d bytes missing \n",offs);
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dp=new_demux_packet(len);
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fast_memcpy(dp->buffer,data,len);
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if (asf->asf_is_dvr_ms)
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dp->pts=time*0.0000001;
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// if(ds==demux->video) printf("ASF time: %8d dur: %5d \n",time,dur);
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dp->pos=demux->filepos;
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/*****************************************************************
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* \brief read the replicated data associated with each segment
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* \parameter pp reference to replicated data
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* \parameter id stream number
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* \parameter seq media object number
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* \parameter keyframe key frame indicator - set to zero if keyframe, non-zero otherwise
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* \parameter seg_time set to payload time when valid, if audio or new video frame payload, zero otherwise
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static void get_payload_extension_data(demuxer_t *demux, unsigned char** pp, unsigned char id, unsigned int seq, int *keyframe, uint64_t *seg_time){
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struct asf_priv* asf = demux->priv;
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uint64_t payload_time; //100ns units
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int i, ext_max, ext_timing_index;
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if(demux->video->id==-1)
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if(demux->v_streams[id])
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if(demux->audio->id==-1)
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if(demux->a_streams[id])
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if (id!=demux->video->id && id!=demux->audio->id) return;
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if (id==demux->video->id) {
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ext_max = asf->vid_repdata_count;
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ext_timing_index = asf->vid_ext_timing_index;
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ext_max = asf->aud_repdata_count;
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ext_timing_index = asf->aud_ext_timing_index;
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asf->new_vid_frame_seg = 0;
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for (i=0; i<ext_max; i++) {
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uint8_t segment_marker;
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if (id==demux->video->id)
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payextsize = asf->vid_repdata_sizes[i];
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payextsize = asf->aud_repdata_sizes[i];
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if (payextsize == 65535) {
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payextsize = AV_RL16(pi);
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// if this is the timing info extension then read the payload time
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if (i == ext_timing_index)
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payload_time = AV_RL64(pi+8);
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// if this is the video frame info extension then
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// set the keyframe indicator, the 'new frame segment' indicator
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// and (initially) the 'frame time'
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if (i == asf->vid_ext_frame_index && id==demux->video->id) {
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segment_marker = pi[0];
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// Known video stream segment_marker values that
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// contain useful information:
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// NTSC/ATSC (29.97fps): 0X4A 01001010
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// PAL/ATSC (25fps): 0X3A 00111010
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// ATSC progressive (29.97fps): 0X7A 01111010
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// ^ this is new video frame marker
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// ^^^^ these bits indicate the framerate
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// 0X4 is 29.97i, 0X3 is 25i, 0X7 is 29.97p, ???=25p
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// ^^^ these bits indicate the frame type:
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// 010 and 011 probably mean P and B
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asf->new_vid_frame_seg = (0X08 & segment_marker) && seq != asf->last_vid_seq;
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if (asf->new_vid_frame_seg) asf->last_vid_seq = seq;
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if (asf->avg_vid_frame_time == 0) {
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// set the average frame time initially (in 100ns units).
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// This is based on what works for known samples.
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// It can be extended if more samples of different types can be obtained.
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if (((segment_marker & 0XF0) >> 4) == 4) {
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asf->avg_vid_frame_time = (uint64_t)((1.001 / 30.0) * 10000000.0);
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asf->know_frame_time=1;
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} else if (((segment_marker & 0XF0) >> 4) == 3) {
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asf->avg_vid_frame_time = (uint64_t)(0.04 * 10000000.0);
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asf->know_frame_time=1;
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} else if (((segment_marker & 0XF0) >> 4) == 6) {
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asf->avg_vid_frame_time = (uint64_t)(0.02 * 10000000.0);
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asf->know_frame_time=1;
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} else if (((segment_marker & 0XF0) >> 4) == 7) {
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asf->avg_vid_frame_time = (uint64_t)((1.001 / 60.0) * 10000000.0);
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asf->know_frame_time=1;
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// we dont know the frame time initially so
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// make a guess and then recalculate as we go.
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asf->avg_vid_frame_time = (uint64_t)((1.001 / 60.0) * 10000000.0);
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asf->know_frame_time=0;
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*keyframe = (asf->new_vid_frame_seg && (segment_marker & 0X07) == 1);
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if (id==demux->video->id && asf->new_vid_frame_seg) {
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// Some samples only have timings on key frames and
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// the rest contain non-cronological timestamps. Interpolating
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// the values between key frames works for all samples.
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asf->found_first_key_frame=1;
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if (!asf->know_frame_time && asf->last_key_payload_time > 0) {
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// We dont know average frametime so recalculate.
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// Giving precedence to the 'weight' of the existing
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// average limits damage done to new value when there is
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// a sudden time jump which happens occasionally.
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asf->avg_vid_frame_time =
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(0.9 * asf->avg_vid_frame_time) +
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(0.1 * ((payload_time - asf->last_key_payload_time) / asf->vid_frame_ct));
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asf->last_key_payload_time = payload_time;
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asf->vid_frame_ct = 1;
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*seg_time = payload_time;
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*seg_time = (asf->last_key_payload_time + (asf->avg_vid_frame_time * (asf->vid_frame_ct-1)));
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if (id==demux->audio->id) {
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if (payload_time != -1)
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asf->last_aud_diff = payload_time - asf->last_aud_pts;
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asf->last_aud_pts += asf->last_aud_diff;
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*seg_time = asf->last_aud_pts;
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//static int num_elementary_packets100=0;
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//static int num_elementary_packets101=0;
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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_asf_fill_buffer(demuxer_t *demux, demux_stream_t *ds){
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struct asf_priv* asf = demux->priv;
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demux->filepos=stream_tell(demux->stream);
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// Brodcast stream have movi_start==movi_end
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if((demux->movi_start < demux->movi_end) && (demux->filepos>=demux->movi_end)){
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demux->stream->eof=1;
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stream_read(demux->stream,asf->packet,asf->packetsize);
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if(demux->stream->eof) return 0; // EOF
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if(asf->packetsize < 2) return 0; // Packet too short
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unsigned char* p=asf->packet;
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unsigned char* p_end=asf->packet+asf->packetsize;
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unsigned char flags=p[0];
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unsigned char segtype=p[1];
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unsigned long time=0;
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unsigned short duration=0;
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unsigned char segsizetype=0x80;
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if( mp_msg_test(MSGT_DEMUX,MSGL_DBG2) ){
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for(i=0;i<FFMIN(16, asf->packetsize);i++) printf(" %02X",asf->packet[i]);
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// skip ECC data if present by testing bit 7 of flags
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// 1xxxbbbb -> ecc data present, skip bbbb byte(s)
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// 0xxxxxxx -> payload parsing info starts
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p += (flags & 0x0f)+1;
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if (p+1 >= p_end) return 0; // Packet too short
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//if(segtype!=0x5d) printf("Warning! packet[4] != 0x5d \n");
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p+=2; // skip flags & segtype
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// Read packet size (plen):
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if(!check_varlen(p, p_end, flags>> 5)) return 0; // Not enough data
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plen = read_varlen(&p, flags >> 5, 0);
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if(!check_varlen(p, p_end, flags>> 1)) return 0; // Not enough data
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sequence = read_varlen(&p, flags >> 1, 0);
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// Read padding size (padding):
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if(!check_varlen(p, p_end, flags>> 3)) return 0; // Not enough data
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padding = read_varlen(&p, flags >> 3, 0);
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if(((flags>>5)&3)!=0){
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// Explicit (absoulte) packet size
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mp_dbg(MSGT_DEMUX,MSGL_DBG2,"Explicit packet size specified: %d \n",plen);
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if(plen>asf->packetsize) mp_msg(MSGT_DEMUX,MSGL_V,"Warning! plen>packetsize! (%d>%d) \n",plen,asf->packetsize);
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// Padding (relative) size
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plen=asf->packetsize-padding;
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// Read time & duration:
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if (p+5 >= p_end) return 0; // Packet too short
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time = AV_RL32(p); p+=4;
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duration = AV_RL16(p); p+=2;
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// Read payload flags:
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// multiple sub-packets
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if (p >= p_end) return 0; // Packet too short
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mp_dbg(MSGT_DEMUX,MSGL_DBG4,"%08"PRIu64": flag=%02X segs=%d seq=%u plen=%u pad=%u time=%ld dur=%d\n",
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(uint64_t)demux->filepos,flags,segs,sequence,plen,padding,time,duration);
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for(seg=0;seg<segs;seg++){
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unsigned char streamno;
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unsigned int x; // offset or timestamp
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mp_msg(MSGT_DEMUX,MSGL_V,"Warning! invalid packet 1, aborting parsing...\n");
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if( mp_msg_test(MSGT_DEMUX,MSGL_DBG2) ){
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printf("seg %d:",seg);
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for(i=0;i<FFMIN(16, p_end - p);i++) printf(" %02X",p[i]);
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if(p[0]&0x80) keyframe=1;
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// Read media object number (seq):
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if(!check_varlen(p, p_end, segtype >> 4)) break; // Not enough data
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seq = read_varlen(&p, segtype >> 4, 0);
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// Read offset or timestamp:
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if(!check_varlen(p, p_end, segtype >> 2)) break; // Not enough data
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x = read_varlen(&p, segtype >> 2, 0);
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// Read replic.data len:
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if(!check_varlen(p, p_end, segtype)) break; // Not enough data
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rlen = read_varlen(&p, segtype, 0);
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// printf("### rlen=%d \n",rlen);
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case 0x01: // 1 = special, means grouping
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//printf("grouping: %02X \n",p[0]);
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++p; // skip PTS delta
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p+=4; // skip object size
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if (p+3 >= p_end) break; // Packet too short
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time2=AV_RL32(p); // read PTS
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if (asf->asf_is_dvr_ms)
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get_payload_extension_data(demux, &p, streamno, seq, &keyframe, &time2);
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mp_msg(MSGT_DEMUX,MSGL_V,"unknown segment type (rlen): 0x%02X \n",rlen);
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if(!check_varlen(p, p_end, segsizetype)) break; // Not enough data
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len = read_varlen(&p, segsizetype, plen-(p-asf->packet));
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len=plen-(p-asf->packet);
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if(len<0 || (p+len)>p_end){
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mp_msg(MSGT_DEMUX,MSGL_V,"ASF_parser: warning! segment len=%d\n",len);
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mp_dbg(MSGT_DEMUX,MSGL_DBG4," seg #%d: streamno=%d seq=%d type=%02X len=%d\n",seg,streamno,seq,rlen,len);
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//printf("ASF_parser: warning! grouping (flag=1) not yet supported!\n",len);
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//printf(" total: %d \n",len);
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//printf(" group part: %d bytes\n",len2);
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if(len2 > len - 1 || len2 < 0) break; // Not enough data
517
len2 = FFMIN(len2, asf->packetsize);
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demux_asf_read_packet(demux,p,len2,streamno,seq,x,duration,-1,keyframe);
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mp_msg(MSGT_DEMUX,MSGL_V,"ASF_parser: warning! groups total != len\n");
529
//printf("fragment offset: %d \n",sh->x);
531
if (!asf->asf_is_dvr_ms || asf->found_first_key_frame) {
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len = FFMIN(len, asf->packetsize);
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demux_asf_read_packet(demux,p,len,streamno,seq,time2,duration,x,keyframe);
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mp_msg(MSGT_DEMUX,MSGL_V,"%08"PRIX64": UNKNOWN TYPE %02X %02X %02X %02X %02X...\n",(int64_t)demux->filepos,asf->packet[0],asf->packet[1],asf->packet[2],asf->packet[3],asf->packet[4]);
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#include "stheader.h"
549
static void demux_seek_asf(demuxer_t *demuxer,float rel_seek_secs,float audio_delay,int flags){
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struct asf_priv* asf = demuxer->priv;
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demux_stream_t *d_audio=demuxer->audio;
552
demux_stream_t *d_video=demuxer->video;
553
sh_audio_t *sh_audio=d_audio->sh;
554
// sh_video_t *sh_video=d_video->sh;
556
//FIXME: OFF_T - didn't test ASF case yet (don't have a large asf...)
557
//FIXME: reports good or bad to steve@daviesfam.org please
559
//================= seek in ASF ==========================
560
float p_rate=asf->packetrate; // packets / sec
561
off_t rel_seek_packs=(flags&SEEK_FACTOR)? // FIXME: int may be enough?
562
(rel_seek_secs*(demuxer->movi_end-demuxer->movi_start)/asf->packetsize):
563
(rel_seek_secs*p_rate);
564
off_t rel_seek_bytes=rel_seek_packs*asf->packetsize;
566
//printf("ASF: packs: %d duration: %d \n",(int)fileh.packets,*((int*)&fileh.duration));
567
// printf("ASF_seek: %d secs -> %d packs -> %d bytes \n",
568
// rel_seek_secs,rel_seek_packs,rel_seek_bytes);
569
newpos=((flags&SEEK_ABSOLUTE)?demuxer->movi_start:demuxer->filepos)+rel_seek_bytes;
570
if(newpos<0 || newpos<demuxer->movi_start) newpos=demuxer->movi_start;
571
// printf("\r -- asf: newpos=%d -- \n",newpos);
572
stream_seek(demuxer->stream,newpos);
574
if (asf->asf_is_dvr_ms) asf->dvr_last_vid_pts = 0.0f;
576
if (d_video->id >= 0)
577
ds_fill_buffer(d_video);
579
ds_fill_buffer(d_audio);
582
if (d_video->id >= 0)
584
if(sh_audio && !d_audio->eof){
585
float a_pts=d_audio->pts;
586
a_pts+=(ds_tell_pts(d_audio)-sh_audio->a_in_buffer_len)/(float)sh_audio->i_bps;
588
if (d_video->pts > a_pts){
589
skip_audio_frame(sh_audio);
590
// if(!ds_fill_buffer(d_audio)) sh_audio=NULL; // skip audio. EOF?
594
if(d_video->flags&1) break; // found a keyframe!
595
if(!ds_fill_buffer(d_video)) break; // skip frame. EOF?
601
static int demux_asf_control(demuxer_t *demuxer,int cmd, void *arg){
602
struct asf_priv* asf = demuxer->priv;
603
/* demux_stream_t *d_audio=demuxer->audio;
604
demux_stream_t *d_video=demuxer->video;
605
sh_audio_t *sh_audio=d_audio->sh;
606
sh_video_t *sh_video=d_video->sh;
609
case DEMUXER_CTRL_GET_TIME_LENGTH:
610
*((double *)arg)=asf->movielength;
611
return DEMUXER_CTRL_OK;
613
case DEMUXER_CTRL_GET_PERCENT_POS:
614
return DEMUXER_CTRL_DONTKNOW;
617
return DEMUXER_CTRL_NOTIMPL;
622
static demuxer_t* demux_open_asf(demuxer_t* demuxer)
624
struct asf_priv* asf = demuxer->priv;
625
sh_video_t *sh_video=NULL;
628
if(!asf) return NULL;
630
if (!read_asf_header(demuxer,asf))
632
stream_reset(demuxer->stream);
633
stream_seek(demuxer->stream,demuxer->movi_start);
634
// demuxer->idx_pos=0;
635
// demuxer->endpos=avi_header.movi_end;
636
if(demuxer->video->id != -2) {
637
if(!ds_fill_buffer(demuxer->video)){
638
mp_msg(MSGT_DEMUXER,MSGL_WARN,"ASF: " MSGTR_MissingVideoStream);
639
demuxer->video->sh=NULL;
640
//printf("ASF: missing video stream!? contact the author, it may be a bug :(\n");
642
sh_video=demuxer->video->sh;
643
sh_video->fps=1000.0f; sh_video->frametime=0.001f;
645
if (asf->asf_is_dvr_ms) {
646
sh_video->bih->biWidth = 0;
647
sh_video->bih->biHeight = 0;
652
if(demuxer->audio->id!=-2){
653
mp_msg(MSGT_DEMUXER,MSGL_V,MSGTR_ASFSearchingForAudioStream,demuxer->audio->id);
654
if(!ds_fill_buffer(demuxer->audio)){
655
mp_msg(MSGT_DEMUXER,MSGL_INFO,"ASF: " MSGTR_MissingAudioStream);
656
demuxer->audio->sh=NULL;
659
if(!demuxer->stream->seek)
666
static void demux_close_asf(demuxer_t *demuxer) {
667
struct asf_priv* asf = demuxer->priv;
671
free(asf->aud_repdata_sizes);
672
free(asf->vid_repdata_sizes);
677
const demuxer_desc_t demuxer_desc_asf = {
684
1, // safe autodetect
686
demux_asf_fill_buffer,