783 lines
25 KiB
C
783 lines
25 KiB
C
/*
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* NSV demuxer
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* Copyright (c) 2004 The FFmpeg Project
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "riff.h"
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//#define DEBUG
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//#define DEBUG_DUMP_INDEX // XXX dumbdriving-271.nsv breaks with it commented!!
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//#define DEBUG_SEEK
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#define CHECK_SUBSEQUENT_NSVS
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//#define DISABLE_AUDIO
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/* max bytes to crawl for trying to resync
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* stupid streaming servers don't start at chunk boundaries...
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*/
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#define NSV_MAX_RESYNC (500*1024)
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#define NSV_MAX_RESYNC_TRIES 300
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/*
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* First version by Francois Revol - revol@free.fr
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* References:
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* (1) http://www.multimedia.cx/nsv-format.txt
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* seems someone came to the same conclusions as me, and updated it:
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* (2) http://www.stud.ktu.lt/~vitslav/nsv/nsv-format.txt
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* http://www.stud.ktu.lt/~vitslav/nsv/
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* official docs
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* (3) http://ultravox.aol.com/NSVFormat.rtf
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* Sample files:
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* (S1) http://www.nullsoft.com/nsv/samples/
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* http://www.nullsoft.com/nsv/samples/faster.nsv
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* http://streamripper.sourceforge.net/openbb/read.php?TID=492&page=4
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*/
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/*
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* notes on the header (Francois Revol):
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*
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* It is followed by strings, then a table, but nothing tells
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* where the table begins according to (1). After checking faster.nsv,
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* I believe NVSf[16-19] gives the size of the strings data
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* (that is the offset of the data table after the header).
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* After checking all samples from (S1) all confirms this.
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*
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* Then, about NSVf[12-15], faster.nsf has 179700. When veiwing it in VLC,
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* I noticed there was about 1 NVSs chunk/s, so I ran
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* strings faster.nsv | grep NSVs | wc -l
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* which gave me 180. That leads me to think that NSVf[12-15] might be the
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* file length in milliseconds.
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* Let's try that:
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* for f in *.nsv; do HTIME="$(od -t x4 "$f" | head -1 | sed 's/.* //')"; echo "'$f' $((0x$HTIME))s = $((0x$HTIME/1000/60)):$((0x$HTIME/1000%60))"; done
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* except for nstrailer (which doesn't have an NSVf header), it repports correct time.
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*
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* nsvtrailer.nsv (S1) does not have any NSVf header, only NSVs chunks,
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* so the header seems to not be mandatory. (for streaming).
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*
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* index slice duration check (excepts nsvtrailer.nsv):
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* for f in [^n]*.nsv; do DUR="$(ffmpeg -i "$f" 2>/dev/null | grep 'NSVf duration' | cut -d ' ' -f 4)"; IC="$(ffmpeg -i "$f" 2>/dev/null | grep 'INDEX ENTRIES' | cut -d ' ' -f 2)"; echo "duration $DUR, slite time $(($DUR/$IC))"; done
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*/
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/*
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* TODO:
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* - handle timestamps !!!
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* - use index
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* - mime-type in probe()
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* - seek
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*/
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#ifdef DEBUG
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#define PRINT(_v) printf _v
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#else
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#define PRINT(_v)
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#endif
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#if 0
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struct NSVf_header {
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uint32_t chunk_tag; /* 'NSVf' */
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uint32_t chunk_size;
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uint32_t file_size; /* max 4GB ??? no one learns anything it seems :^) */
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uint32_t file_length; //unknown1; /* what about MSB of file_size ? */
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uint32_t info_strings_size; /* size of the info strings */ //unknown2;
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uint32_t table_entries;
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uint32_t table_entries_used; /* the left ones should be -1 */
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};
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struct NSVs_header {
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uint32_t chunk_tag; /* 'NSVs' */
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uint32_t v4cc; /* or 'NONE' */
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uint32_t a4cc; /* or 'NONE' */
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uint16_t vwidth; /* assert(vwidth%16==0) */
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uint16_t vheight; /* assert(vheight%16==0) */
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uint8_t framerate; /* value = (framerate&0x80)?frtable[frameratex0x7f]:framerate */
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uint16_t unknown;
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};
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struct nsv_avchunk_header {
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uint8_t vchunk_size_lsb;
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uint16_t vchunk_size_msb; /* value = (vchunk_size_msb << 4) | (vchunk_size_lsb >> 4) */
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uint16_t achunk_size;
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};
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struct nsv_pcm_header {
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uint8_t bits_per_sample;
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uint8_t channel_count;
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uint16_t sample_rate;
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};
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#endif
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/* variation from avi.h */
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/*typedef struct CodecTag {
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int id;
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unsigned int tag;
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} CodecTag;*/
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/* tags */
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#define T_NSVF MKTAG('N', 'S', 'V', 'f') /* file header */
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#define T_NSVS MKTAG('N', 'S', 'V', 's') /* chunk header */
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#define T_TOC2 MKTAG('T', 'O', 'C', '2') /* extra index marker */
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#define T_NONE MKTAG('N', 'O', 'N', 'E') /* null a/v 4CC */
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#define T_SUBT MKTAG('S', 'U', 'B', 'T') /* subtitle aux data */
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#define T_ASYN MKTAG('A', 'S', 'Y', 'N') /* async a/v aux marker */
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#define T_KEYF MKTAG('K', 'E', 'Y', 'F') /* video keyframe aux marker (addition) */
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#define TB_NSVF MKBETAG('N', 'S', 'V', 'f')
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#define TB_NSVS MKBETAG('N', 'S', 'V', 's')
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/* hardcoded stream indexes */
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#define NSV_ST_VIDEO 0
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#define NSV_ST_AUDIO 1
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#define NSV_ST_SUBT 2
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enum NSVStatus {
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NSV_UNSYNC,
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NSV_FOUND_NSVF,
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NSV_HAS_READ_NSVF,
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NSV_FOUND_NSVS,
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NSV_HAS_READ_NSVS,
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NSV_FOUND_BEEF,
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NSV_GOT_VIDEO,
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NSV_GOT_AUDIO,
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};
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typedef struct NSVStream {
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int frame_offset; /* current frame (video) or byte (audio) counter
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(used to compute the pts) */
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int scale;
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int rate;
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int sample_size; /* audio only data */
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int start;
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int new_frame_offset; /* temporary storage (used during seek) */
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int cum_len; /* temporary storage (used during seek) */
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} NSVStream;
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typedef struct {
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int base_offset;
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int NSVf_end;
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uint32_t *nsvs_file_offset;
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int index_entries;
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enum NSVStatus state;
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AVPacket ahead[2]; /* [v, a] if .data is !NULL there is something */
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/* cached */
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int64_t duration;
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uint32_t vtag, atag;
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uint16_t vwidth, vheight;
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int16_t avsync;
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AVRational framerate;
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uint32_t *nsvs_timestamps;
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//DVDemuxContext* dv_demux;
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} NSVContext;
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static const AVCodecTag nsv_codec_video_tags[] = {
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{ CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') },
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{ CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
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{ CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
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{ CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') },
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{ CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
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{ CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') },
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{ CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
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{ CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
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{ CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
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/*
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{ CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
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{ CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
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*/
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{ CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
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{ CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') },
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{ CODEC_ID_NONE, 0 },
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};
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static const AVCodecTag nsv_codec_audio_tags[] = {
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{ CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') },
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{ CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') },
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{ CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') },
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{ CODEC_ID_SPEEX, MKTAG('S', 'P', 'X', ' ') },
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{ CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') },
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{ CODEC_ID_NONE, 0 },
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};
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//static int nsv_load_index(AVFormatContext *s);
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static int nsv_read_chunk(AVFormatContext *s, int fill_header);
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#ifdef DEBUG
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static void print_tag(const char *str, unsigned int tag, int size)
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{
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printf("%s: tag=%c%c%c%c\n",
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str, tag & 0xff,
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(tag >> 8) & 0xff,
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(tag >> 16) & 0xff,
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(tag >> 24) & 0xff);
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}
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#endif
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/* try to find something we recognize, and set the state accordingly */
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static int nsv_resync(AVFormatContext *s)
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{
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NSVContext *nsv = s->priv_data;
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ByteIOContext *pb = s->pb;
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uint32_t v = 0;
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int i;
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PRINT(("%s(), offset = %"PRId64", state = %d\n", __FUNCTION__, url_ftell(pb), nsv->state));
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//nsv->state = NSV_UNSYNC;
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for (i = 0; i < NSV_MAX_RESYNC; i++) {
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if (url_feof(pb)) {
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PRINT(("NSV EOF\n"));
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nsv->state = NSV_UNSYNC;
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return -1;
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}
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v <<= 8;
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v |= get_byte(pb);
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/*
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if (i < 8) {
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PRINT(("NSV resync: [%d] = %02x\n", i, v & 0x0FF));
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}
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*/
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if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */
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PRINT(("NSV resynced on BEEF after %d bytes\n", i+1));
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nsv->state = NSV_FOUND_BEEF;
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return 0;
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}
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/* we read as big endian, thus the MK*BE* */
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if (v == TB_NSVF) { /* NSVf */
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PRINT(("NSV resynced on NSVf after %d bytes\n", i+1));
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nsv->state = NSV_FOUND_NSVF;
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return 0;
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}
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if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
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PRINT(("NSV resynced on NSVs after %d bytes\n", i+1));
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nsv->state = NSV_FOUND_NSVS;
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return 0;
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}
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}
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PRINT(("NSV sync lost\n"));
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return -1;
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}
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static int nsv_parse_NSVf_header(AVFormatContext *s, AVFormatParameters *ap)
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{
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NSVContext *nsv = s->priv_data;
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ByteIOContext *pb = s->pb;
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unsigned int file_size, size;
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int64_t duration;
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int strings_size;
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int table_entries;
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int table_entries_used;
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PRINT(("%s()\n", __FUNCTION__));
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nsv->state = NSV_UNSYNC; /* in case we fail */
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size = get_le32(pb);
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if (size < 28)
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return -1;
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nsv->NSVf_end = size;
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//s->file_size = (uint32_t)get_le32(pb);
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file_size = (uint32_t)get_le32(pb);
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PRINT(("NSV NSVf chunk_size %u\n", size));
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PRINT(("NSV NSVf file_size %u\n", file_size));
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nsv->duration = duration = get_le32(pb); /* in ms */
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PRINT(("NSV NSVf duration %"PRId64" ms\n", duration));
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// XXX: store it in AVStreams
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strings_size = get_le32(pb);
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table_entries = get_le32(pb);
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table_entries_used = get_le32(pb);
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PRINT(("NSV NSVf info-strings size: %d, table entries: %d, bis %d\n",
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strings_size, table_entries, table_entries_used));
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if (url_feof(pb))
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return -1;
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PRINT(("NSV got header; filepos %"PRId64"\n", url_ftell(pb)));
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if (strings_size > 0) {
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char *strings; /* last byte will be '\0' to play safe with str*() */
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char *p, *endp;
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char *token, *value;
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char quote;
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p = strings = av_mallocz(strings_size + 1);
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endp = strings + strings_size;
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get_buffer(pb, strings, strings_size);
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while (p < endp) {
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while (*p == ' ')
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p++; /* strip out spaces */
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if (p >= endp-2)
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break;
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token = p;
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p = strchr(p, '=');
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if (!p || p >= endp-2)
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break;
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*p++ = '\0';
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quote = *p++;
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value = p;
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p = strchr(p, quote);
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if (!p || p >= endp)
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break;
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*p++ = '\0';
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PRINT(("NSV NSVf INFO: %s='%s'\n", token, value));
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av_metadata_set(&s->metadata, token, value);
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}
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av_free(strings);
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}
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if (url_feof(pb))
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return -1;
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PRINT(("NSV got infos; filepos %"PRId64"\n", url_ftell(pb)));
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if (table_entries_used > 0) {
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int i;
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nsv->index_entries = table_entries_used;
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if((unsigned)table_entries_used >= UINT_MAX / sizeof(uint32_t))
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return -1;
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nsv->nsvs_file_offset = av_malloc((unsigned)table_entries_used * sizeof(uint32_t));
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for(i=0;i<table_entries_used;i++)
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nsv->nsvs_file_offset[i] = get_le32(pb) + size;
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if(table_entries > table_entries_used &&
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get_le32(pb) == MKTAG('T','O','C','2')) {
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nsv->nsvs_timestamps = av_malloc((unsigned)table_entries_used*sizeof(uint32_t));
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for(i=0;i<table_entries_used;i++) {
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nsv->nsvs_timestamps[i] = get_le32(pb);
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}
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}
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}
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PRINT(("NSV got index; filepos %"PRId64"\n", url_ftell(pb)));
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#ifdef DEBUG_DUMP_INDEX
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#define V(v) ((v<0x20 || v > 127)?'.':v)
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/* dump index */
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PRINT(("NSV %d INDEX ENTRIES:\n", table_entries));
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PRINT(("NSV [dataoffset][fileoffset]\n", table_entries));
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for (i = 0; i < table_entries; i++) {
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unsigned char b[8];
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url_fseek(pb, size + nsv->nsvs_file_offset[i], SEEK_SET);
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get_buffer(pb, b, 8);
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PRINT(("NSV [0x%08lx][0x%08lx]: %02x %02x %02x %02x %02x %02x %02x %02x"
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"%c%c%c%c%c%c%c%c\n",
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nsv->nsvs_file_offset[i], size + nsv->nsvs_file_offset[i],
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b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7],
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V(b[0]), V(b[1]), V(b[2]), V(b[3]), V(b[4]), V(b[5]), V(b[6]), V(b[7]) ));
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}
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//url_fseek(pb, size, SEEK_SET); /* go back to end of header */
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#undef V
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#endif
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url_fseek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */
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if (url_feof(pb))
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return -1;
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nsv->state = NSV_HAS_READ_NSVF;
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return 0;
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}
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static int nsv_parse_NSVs_header(AVFormatContext *s, AVFormatParameters *ap)
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{
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NSVContext *nsv = s->priv_data;
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ByteIOContext *pb = s->pb;
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uint32_t vtag, atag;
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uint16_t vwidth, vheight;
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AVRational framerate;
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int i;
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AVStream *st;
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NSVStream *nst;
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PRINT(("%s()\n", __FUNCTION__));
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vtag = get_le32(pb);
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atag = get_le32(pb);
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vwidth = get_le16(pb);
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vheight = get_le16(pb);
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i = get_byte(pb);
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PRINT(("NSV NSVs framerate code %2x\n", i));
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if(i&0x80) { /* odd way of giving native framerates from docs */
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int t=(i & 0x7F)>>2;
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if(t<16) framerate = (AVRational){1, t+1};
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else framerate = (AVRational){t-15, 1};
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if(i&1){
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framerate.num *= 1000;
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framerate.den *= 1001;
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}
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if((i&3)==3) framerate.num *= 24;
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else if((i&3)==2) framerate.num *= 25;
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else framerate.num *= 30;
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}
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else
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framerate= (AVRational){i, 1};
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nsv->avsync = get_le16(pb);
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nsv->framerate = framerate;
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#ifdef DEBUG
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print_tag("NSV NSVs vtag", vtag, 0);
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print_tag("NSV NSVs atag", atag, 0);
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PRINT(("NSV NSVs vsize %dx%d\n", vwidth, vheight));
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#endif
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/* XXX change to ap != NULL ? */
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if (s->nb_streams == 0) { /* streams not yet published, let's do that */
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nsv->vtag = vtag;
|
|
nsv->atag = atag;
|
|
nsv->vwidth = vwidth;
|
|
nsv->vheight = vwidth;
|
|
if (vtag != T_NONE) {
|
|
int i;
|
|
st = av_new_stream(s, NSV_ST_VIDEO);
|
|
if (!st)
|
|
goto fail;
|
|
|
|
nst = av_mallocz(sizeof(NSVStream));
|
|
if (!nst)
|
|
goto fail;
|
|
st->priv_data = nst;
|
|
st->codec->codec_type = CODEC_TYPE_VIDEO;
|
|
st->codec->codec_tag = vtag;
|
|
st->codec->codec_id = ff_codec_get_id(nsv_codec_video_tags, vtag);
|
|
st->codec->width = vwidth;
|
|
st->codec->height = vheight;
|
|
st->codec->bits_per_coded_sample = 24; /* depth XXX */
|
|
|
|
av_set_pts_info(st, 64, framerate.den, framerate.num);
|
|
st->start_time = 0;
|
|
st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den);
|
|
|
|
for(i=0;i<nsv->index_entries;i++) {
|
|
if(nsv->nsvs_timestamps) {
|
|
av_add_index_entry(st, nsv->nsvs_file_offset[i], nsv->nsvs_timestamps[i],
|
|
0, 0, AVINDEX_KEYFRAME);
|
|
} else {
|
|
int64_t ts = av_rescale(i*nsv->duration/nsv->index_entries, framerate.num, 1000*framerate.den);
|
|
av_add_index_entry(st, nsv->nsvs_file_offset[i], ts, 0, 0, AVINDEX_KEYFRAME);
|
|
}
|
|
}
|
|
}
|
|
if (atag != T_NONE) {
|
|
#ifndef DISABLE_AUDIO
|
|
st = av_new_stream(s, NSV_ST_AUDIO);
|
|
if (!st)
|
|
goto fail;
|
|
|
|
nst = av_mallocz(sizeof(NSVStream));
|
|
if (!nst)
|
|
goto fail;
|
|
st->priv_data = nst;
|
|
st->codec->codec_type = CODEC_TYPE_AUDIO;
|
|
st->codec->codec_tag = atag;
|
|
st->codec->codec_id = ff_codec_get_id(nsv_codec_audio_tags, atag);
|
|
|
|
st->need_parsing = AVSTREAM_PARSE_FULL; /* for PCM we will read a chunk later and put correct info */
|
|
|
|
/* set timebase to common denominator of ms and framerate */
|
|
av_set_pts_info(st, 64, 1, framerate.num*1000);
|
|
st->start_time = 0;
|
|
st->duration = (int64_t)nsv->duration * framerate.num;
|
|
#endif
|
|
}
|
|
#ifdef CHECK_SUBSEQUENT_NSVS
|
|
} else {
|
|
if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
|
|
PRINT(("NSV NSVs header values differ from the first one!!!\n"));
|
|
//return -1;
|
|
}
|
|
#endif /* CHECK_SUBSEQUENT_NSVS */
|
|
}
|
|
|
|
nsv->state = NSV_HAS_READ_NSVS;
|
|
return 0;
|
|
fail:
|
|
/* XXX */
|
|
nsv->state = NSV_UNSYNC;
|
|
return -1;
|
|
}
|
|
|
|
static int nsv_read_header(AVFormatContext *s, AVFormatParameters *ap)
|
|
{
|
|
NSVContext *nsv = s->priv_data;
|
|
int i, err;
|
|
|
|
PRINT(("%s()\n", __FUNCTION__));
|
|
PRINT(("filename '%s'\n", s->filename));
|
|
|
|
nsv->state = NSV_UNSYNC;
|
|
nsv->ahead[0].data = nsv->ahead[1].data = NULL;
|
|
|
|
for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
|
|
if (nsv_resync(s) < 0)
|
|
return -1;
|
|
if (nsv->state == NSV_FOUND_NSVF)
|
|
err = nsv_parse_NSVf_header(s, ap);
|
|
/* we need the first NSVs also... */
|
|
if (nsv->state == NSV_FOUND_NSVS) {
|
|
err = nsv_parse_NSVs_header(s, ap);
|
|
break; /* we just want the first one */
|
|
}
|
|
}
|
|
if (s->nb_streams < 1) /* no luck so far */
|
|
return -1;
|
|
/* now read the first chunk, so we can attempt to decode more info */
|
|
err = nsv_read_chunk(s, 1);
|
|
|
|
PRINT(("parsed header\n"));
|
|
return 0;
|
|
}
|
|
|
|
static int nsv_read_chunk(AVFormatContext *s, int fill_header)
|
|
{
|
|
NSVContext *nsv = s->priv_data;
|
|
ByteIOContext *pb = s->pb;
|
|
AVStream *st[2] = {NULL, NULL};
|
|
NSVStream *nst;
|
|
AVPacket *pkt;
|
|
int i, err = 0;
|
|
uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */
|
|
uint32_t vsize;
|
|
uint16_t asize;
|
|
uint16_t auxsize;
|
|
uint32_t auxtag;
|
|
|
|
PRINT(("%s(%d)\n", __FUNCTION__, fill_header));
|
|
|
|
if (nsv->ahead[0].data || nsv->ahead[1].data)
|
|
return 0; //-1; /* hey! eat what you've in your plate first! */
|
|
|
|
null_chunk_retry:
|
|
if (url_feof(pb))
|
|
return -1;
|
|
|
|
for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++)
|
|
err = nsv_resync(s);
|
|
if (err < 0)
|
|
return err;
|
|
if (nsv->state == NSV_FOUND_NSVS)
|
|
err = nsv_parse_NSVs_header(s, NULL);
|
|
if (err < 0)
|
|
return err;
|
|
if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF)
|
|
return -1;
|
|
|
|
auxcount = get_byte(pb);
|
|
vsize = get_le16(pb);
|
|
asize = get_le16(pb);
|
|
vsize = (vsize << 4) | (auxcount >> 4);
|
|
auxcount &= 0x0f;
|
|
PRINT(("NSV CHUNK %d aux, %u bytes video, %d bytes audio\n", auxcount, vsize, asize));
|
|
/* skip aux stuff */
|
|
for (i = 0; i < auxcount; i++) {
|
|
auxsize = get_le16(pb);
|
|
auxtag = get_le32(pb);
|
|
PRINT(("NSV aux data: '%c%c%c%c', %d bytes\n",
|
|
(auxtag & 0x0ff),
|
|
((auxtag >> 8) & 0x0ff),
|
|
((auxtag >> 16) & 0x0ff),
|
|
((auxtag >> 24) & 0x0ff),
|
|
auxsize));
|
|
url_fskip(pb, auxsize);
|
|
vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming braindead */
|
|
}
|
|
|
|
if (url_feof(pb))
|
|
return -1;
|
|
if (!vsize && !asize) {
|
|
nsv->state = NSV_UNSYNC;
|
|
goto null_chunk_retry;
|
|
}
|
|
|
|
/* map back streams to v,a */
|
|
if (s->streams[0])
|
|
st[s->streams[0]->id] = s->streams[0];
|
|
if (s->streams[1])
|
|
st[s->streams[1]->id] = s->streams[1];
|
|
|
|
if (vsize/* && st[NSV_ST_VIDEO]*/) {
|
|
nst = st[NSV_ST_VIDEO]->priv_data;
|
|
pkt = &nsv->ahead[NSV_ST_VIDEO];
|
|
av_get_packet(pb, pkt, vsize);
|
|
pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
|
|
pkt->dts = nst->frame_offset;
|
|
pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
|
|
/*
|
|
for (i = 0; i < MIN(8, vsize); i++)
|
|
PRINT(("NSV video: [%d] = %02x\n", i, pkt->data[i]));
|
|
*/
|
|
}
|
|
if(st[NSV_ST_VIDEO])
|
|
((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset++;
|
|
|
|
if (asize/*st[NSV_ST_AUDIO]*/) {
|
|
nst = st[NSV_ST_AUDIO]->priv_data;
|
|
pkt = &nsv->ahead[NSV_ST_AUDIO];
|
|
/* read raw audio specific header on the first audio chunk... */
|
|
/* on ALL audio chunks ?? seems so! */
|
|
if (asize && st[NSV_ST_AUDIO]->codec->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
|
|
uint8_t bps;
|
|
uint8_t channels;
|
|
uint16_t samplerate;
|
|
bps = get_byte(pb);
|
|
channels = get_byte(pb);
|
|
samplerate = get_le16(pb);
|
|
asize-=4;
|
|
PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate));
|
|
if (fill_header) {
|
|
st[NSV_ST_AUDIO]->need_parsing = AVSTREAM_PARSE_NONE; /* we know everything */
|
|
if (bps != 16) {
|
|
PRINT(("NSV AUDIO bit/sample != 16 (%d)!!!\n", bps));
|
|
}
|
|
bps /= channels; // ???
|
|
if (bps == 8)
|
|
st[NSV_ST_AUDIO]->codec->codec_id = CODEC_ID_PCM_U8;
|
|
samplerate /= 4;/* UGH ??? XXX */
|
|
channels = 1;
|
|
st[NSV_ST_AUDIO]->codec->channels = channels;
|
|
st[NSV_ST_AUDIO]->codec->sample_rate = samplerate;
|
|
PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate));
|
|
}
|
|
}
|
|
av_get_packet(pb, pkt, asize);
|
|
pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO;
|
|
pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
|
|
if( nsv->state == NSV_HAS_READ_NSVS && st[NSV_ST_VIDEO] ) {
|
|
/* on a nsvs frame we have new information on a/v sync */
|
|
pkt->dts = (((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset-1);
|
|
pkt->dts *= (int64_t)1000 * nsv->framerate.den;
|
|
pkt->dts += (int64_t)nsv->avsync * nsv->framerate.num;
|
|
PRINT(("NSV AUDIO: sync:%d, dts:%"PRId64, nsv->avsync, pkt->dts));
|
|
}
|
|
nst->frame_offset++;
|
|
}
|
|
|
|
nsv->state = NSV_UNSYNC;
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
NSVContext *nsv = s->priv_data;
|
|
int i, err = 0;
|
|
|
|
PRINT(("%s()\n", __FUNCTION__));
|
|
|
|
/* in case we don't already have something to eat ... */
|
|
if (nsv->ahead[0].data == NULL && nsv->ahead[1].data == NULL)
|
|
err = nsv_read_chunk(s, 0);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
/* now pick one of the plates */
|
|
for (i = 0; i < 2; i++) {
|
|
if (nsv->ahead[i].data) {
|
|
PRINT(("%s: using cached packet[%d]\n", __FUNCTION__, i));
|
|
/* avoid the cost of new_packet + memcpy(->data) */
|
|
memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket));
|
|
nsv->ahead[i].data = NULL; /* we ate that one */
|
|
return pkt->size;
|
|
}
|
|
}
|
|
|
|
/* this restaurant is not approvisionned :^] */
|
|
return -1;
|
|
}
|
|
|
|
static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
|
|
{
|
|
NSVContext *nsv = s->priv_data;
|
|
AVStream *st = s->streams[stream_index];
|
|
NSVStream *nst = st->priv_data;
|
|
int index;
|
|
|
|
index = av_index_search_timestamp(st, timestamp, flags);
|
|
if(index < 0)
|
|
return -1;
|
|
|
|
url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET);
|
|
nst->frame_offset = st->index_entries[index].timestamp;
|
|
nsv->state = NSV_UNSYNC;
|
|
return 0;
|
|
}
|
|
|
|
static int nsv_read_close(AVFormatContext *s)
|
|
{
|
|
/* int i; */
|
|
NSVContext *nsv = s->priv_data;
|
|
|
|
av_freep(&nsv->nsvs_file_offset);
|
|
av_freep(&nsv->nsvs_timestamps);
|
|
|
|
#if 0
|
|
|
|
for(i=0;i<s->nb_streams;i++) {
|
|
AVStream *st = s->streams[i];
|
|
NSVStream *ast = st->priv_data;
|
|
if(ast){
|
|
av_free(ast->index_entries);
|
|
av_free(ast);
|
|
}
|
|
av_free(st->codec->palctrl);
|
|
}
|
|
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static int nsv_probe(AVProbeData *p)
|
|
{
|
|
int i;
|
|
// PRINT(("nsv_probe(), buf_size %d\n", p->buf_size));
|
|
/* check file header */
|
|
/* streamed files might not have any header */
|
|
if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
|
|
p->buf[2] == 'V' && (p->buf[3] == 'f' || p->buf[3] == 's'))
|
|
return AVPROBE_SCORE_MAX;
|
|
/* XXX: do streamed files always start at chunk boundary ?? */
|
|
/* or do we need to search NSVs in the byte stream ? */
|
|
/* seems the servers don't bother starting clean chunks... */
|
|
/* sometimes even the first header is at 9KB or something :^) */
|
|
for (i = 1; i < p->buf_size - 3; i++) {
|
|
if (p->buf[i+0] == 'N' && p->buf[i+1] == 'S' &&
|
|
p->buf[i+2] == 'V' && p->buf[i+3] == 's')
|
|
return AVPROBE_SCORE_MAX-20;
|
|
}
|
|
/* so we'll have more luck on extension... */
|
|
if (match_ext(p->filename, "nsv"))
|
|
return AVPROBE_SCORE_MAX/2;
|
|
/* FIXME: add mime-type check */
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat nsv_demuxer = {
|
|
"nsv",
|
|
NULL_IF_CONFIG_SMALL("Nullsoft Streaming Video"),
|
|
sizeof(NSVContext),
|
|
nsv_probe,
|
|
nsv_read_header,
|
|
nsv_read_packet,
|
|
nsv_read_close,
|
|
nsv_read_seek,
|
|
};
|