/* * NSV demuxer * Copyright (c) 2004 The FFmpeg Project * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "avformat.h" #include "riff.h" //#define DEBUG //#define DEBUG_DUMP_INDEX // XXX dumbdriving-271.nsv breaks with it commented!! //#define DEBUG_SEEK #define CHECK_SUBSEQUENT_NSVS //#define DISABLE_AUDIO /* max bytes to crawl for trying to resync * stupid streaming servers don't start at chunk boundaries... */ #define NSV_MAX_RESYNC (500*1024) #define NSV_MAX_RESYNC_TRIES 300 /* * First version by Francois Revol - revol@free.fr * References: * (1) http://www.multimedia.cx/nsv-format.txt * seems someone came to the same conclusions as me, and updated it: * (2) http://www.stud.ktu.lt/~vitslav/nsv/nsv-format.txt * http://www.stud.ktu.lt/~vitslav/nsv/ * official docs * (3) http://ultravox.aol.com/NSVFormat.rtf * Sample files: * (S1) http://www.nullsoft.com/nsv/samples/ * http://www.nullsoft.com/nsv/samples/faster.nsv * http://streamripper.sourceforge.net/openbb/read.php?TID=492&page=4 */ /* * notes on the header (Francois Revol): * * It is followed by strings, then a table, but nothing tells * where the table begins according to (1). After checking faster.nsv, * I believe NVSf[16-19] gives the size of the strings data * (that is the offset of the data table after the header). * After checking all samples from (S1) all confirms this. * * Then, about NSVf[12-15], faster.nsf has 179700. When veiwing it in VLC, * I noticed there was about 1 NVSs chunk/s, so I ran * strings faster.nsv | grep NSVs | wc -l * which gave me 180. That leads me to think that NSVf[12-15] might be the * file length in milliseconds. * Let's try that: * 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 * except for nstrailer (which doesn't have an NSVf header), it repports correct time. * * nsvtrailer.nsv (S1) does not have any NSVf header, only NSVs chunks, * so the header seems to not be mandatory. (for streaming). * * index slice duration check (excepts nsvtrailer.nsv): * 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 */ /* * TODO: * - handle timestamps !!! * - use index * - mime-type in probe() * - seek */ #ifdef DEBUG #define PRINT(_v) printf _v #else #define PRINT(_v) #endif #if 0 struct NSVf_header { uint32_t chunk_tag; /* 'NSVf' */ uint32_t chunk_size; uint32_t file_size; /* max 4GB ??? no one learns anything it seems :^) */ uint32_t file_length; //unknown1; /* what about MSB of file_size ? */ uint32_t info_strings_size; /* size of the info strings */ //unknown2; uint32_t table_entries; uint32_t table_entries_used; /* the left ones should be -1 */ }; struct NSVs_header { uint32_t chunk_tag; /* 'NSVs' */ uint32_t v4cc; /* or 'NONE' */ uint32_t a4cc; /* or 'NONE' */ uint16_t vwidth; /* assert(vwidth%16==0) */ uint16_t vheight; /* assert(vheight%16==0) */ uint8_t framerate; /* value = (framerate&0x80)?frtable[frameratex0x7f]:framerate */ uint16_t unknown; }; struct nsv_avchunk_header { uint8_t vchunk_size_lsb; uint16_t vchunk_size_msb; /* value = (vchunk_size_msb << 4) | (vchunk_size_lsb >> 4) */ uint16_t achunk_size; }; struct nsv_pcm_header { uint8_t bits_per_sample; uint8_t channel_count; uint16_t sample_rate; }; #endif /* variation from avi.h */ /*typedef struct CodecTag { int id; unsigned int tag; } CodecTag;*/ /* tags */ #define T_NSVF MKTAG('N', 'S', 'V', 'f') /* file header */ #define T_NSVS MKTAG('N', 'S', 'V', 's') /* chunk header */ #define T_TOC2 MKTAG('T', 'O', 'C', '2') /* extra index marker */ #define T_NONE MKTAG('N', 'O', 'N', 'E') /* null a/v 4CC */ #define T_SUBT MKTAG('S', 'U', 'B', 'T') /* subtitle aux data */ #define T_ASYN MKTAG('A', 'S', 'Y', 'N') /* async a/v aux marker */ #define T_KEYF MKTAG('K', 'E', 'Y', 'F') /* video keyframe aux marker (addition) */ #define TB_NSVF MKBETAG('N', 'S', 'V', 'f') #define TB_NSVS MKBETAG('N', 'S', 'V', 's') /* hardcoded stream indexes */ #define NSV_ST_VIDEO 0 #define NSV_ST_AUDIO 1 #define NSV_ST_SUBT 2 enum NSVStatus { NSV_UNSYNC, NSV_FOUND_NSVF, NSV_HAS_READ_NSVF, NSV_FOUND_NSVS, NSV_HAS_READ_NSVS, NSV_FOUND_BEEF, NSV_GOT_VIDEO, NSV_GOT_AUDIO, }; typedef struct NSVStream { int frame_offset; /* current frame (video) or byte (audio) counter (used to compute the pts) */ int scale; int rate; int sample_size; /* audio only data */ int start; int new_frame_offset; /* temporary storage (used during seek) */ int cum_len; /* temporary storage (used during seek) */ } NSVStream; typedef struct { int base_offset; int NSVf_end; uint32_t *nsvs_file_offset; int index_entries; enum NSVStatus state; AVPacket ahead[2]; /* [v, a] if .data is !NULL there is something */ /* cached */ int64_t duration; uint32_t vtag, atag; uint16_t vwidth, vheight; int16_t avsync; AVRational framerate; uint32_t *nsvs_timestamps; //DVDemuxContext* dv_demux; } NSVContext; static const AVCodecTag nsv_codec_video_tags[] = { { CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') }, { CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') }, { CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') }, { CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') }, { CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') }, { CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') }, { CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') }, { CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') }, { CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') }, /* { CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') }, { CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') }, */ { CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */ { CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') }, { CODEC_ID_NONE, 0 }, }; static const AVCodecTag nsv_codec_audio_tags[] = { { CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') }, { CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') }, { CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') }, { CODEC_ID_SPEEX, MKTAG('S', 'P', 'X', ' ') }, { CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') }, { CODEC_ID_NONE, 0 }, }; //static int nsv_load_index(AVFormatContext *s); static int nsv_read_chunk(AVFormatContext *s, int fill_header); #ifdef DEBUG static void print_tag(const char *str, unsigned int tag, int size) { printf("%s: tag=%c%c%c%c\n", str, tag & 0xff, (tag >> 8) & 0xff, (tag >> 16) & 0xff, (tag >> 24) & 0xff); } #endif /* try to find something we recognize, and set the state accordingly */ static int nsv_resync(AVFormatContext *s) { NSVContext *nsv = s->priv_data; ByteIOContext *pb = s->pb; uint32_t v = 0; int i; PRINT(("%s(), offset = %"PRId64", state = %d\n", __FUNCTION__, url_ftell(pb), nsv->state)); //nsv->state = NSV_UNSYNC; for (i = 0; i < NSV_MAX_RESYNC; i++) { if (url_feof(pb)) { PRINT(("NSV EOF\n")); nsv->state = NSV_UNSYNC; return -1; } v <<= 8; v |= get_byte(pb); /* if (i < 8) { PRINT(("NSV resync: [%d] = %02x\n", i, v & 0x0FF)); } */ if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */ PRINT(("NSV resynced on BEEF after %d bytes\n", i+1)); nsv->state = NSV_FOUND_BEEF; return 0; } /* we read as big endian, thus the MK*BE* */ if (v == TB_NSVF) { /* NSVf */ PRINT(("NSV resynced on NSVf after %d bytes\n", i+1)); nsv->state = NSV_FOUND_NSVF; return 0; } if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */ PRINT(("NSV resynced on NSVs after %d bytes\n", i+1)); nsv->state = NSV_FOUND_NSVS; return 0; } } PRINT(("NSV sync lost\n")); return -1; } static int nsv_parse_NSVf_header(AVFormatContext *s, AVFormatParameters *ap) { NSVContext *nsv = s->priv_data; ByteIOContext *pb = s->pb; unsigned int file_size, size; int64_t duration; int strings_size; int table_entries; int table_entries_used; PRINT(("%s()\n", __FUNCTION__)); nsv->state = NSV_UNSYNC; /* in case we fail */ size = get_le32(pb); if (size < 28) return -1; nsv->NSVf_end = size; //s->file_size = (uint32_t)get_le32(pb); file_size = (uint32_t)get_le32(pb); PRINT(("NSV NSVf chunk_size %u\n", size)); PRINT(("NSV NSVf file_size %u\n", file_size)); nsv->duration = duration = get_le32(pb); /* in ms */ PRINT(("NSV NSVf duration %"PRId64" ms\n", duration)); // XXX: store it in AVStreams strings_size = get_le32(pb); table_entries = get_le32(pb); table_entries_used = get_le32(pb); PRINT(("NSV NSVf info-strings size: %d, table entries: %d, bis %d\n", strings_size, table_entries, table_entries_used)); if (url_feof(pb)) return -1; PRINT(("NSV got header; filepos %"PRId64"\n", url_ftell(pb))); if (strings_size > 0) { char *strings; /* last byte will be '\0' to play safe with str*() */ char *p, *endp; char *token, *value; char quote; p = strings = av_mallocz(strings_size + 1); endp = strings + strings_size; get_buffer(pb, strings, strings_size); while (p < endp) { while (*p == ' ') p++; /* strip out spaces */ if (p >= endp-2) break; token = p; p = strchr(p, '='); if (!p || p >= endp-2) break; *p++ = '\0'; quote = *p++; value = p; p = strchr(p, quote); if (!p || p >= endp) break; *p++ = '\0'; PRINT(("NSV NSVf INFO: %s='%s'\n", token, value)); av_metadata_set2(&s->metadata, token, value, 0); } av_free(strings); } if (url_feof(pb)) return -1; PRINT(("NSV got infos; filepos %"PRId64"\n", url_ftell(pb))); if (table_entries_used > 0) { int i; nsv->index_entries = table_entries_used; if((unsigned)table_entries_used >= UINT_MAX / sizeof(uint32_t)) return -1; nsv->nsvs_file_offset = av_malloc((unsigned)table_entries_used * sizeof(uint32_t)); for(i=0;i<table_entries_used;i++) nsv->nsvs_file_offset[i] = get_le32(pb) + size; if(table_entries > table_entries_used && get_le32(pb) == MKTAG('T','O','C','2')) { nsv->nsvs_timestamps = av_malloc((unsigned)table_entries_used*sizeof(uint32_t)); for(i=0;i<table_entries_used;i++) { nsv->nsvs_timestamps[i] = get_le32(pb); } } } PRINT(("NSV got index; filepos %"PRId64"\n", url_ftell(pb))); #ifdef DEBUG_DUMP_INDEX #define V(v) ((v<0x20 || v > 127)?'.':v) /* dump index */ PRINT(("NSV %d INDEX ENTRIES:\n", table_entries)); PRINT(("NSV [dataoffset][fileoffset]\n", table_entries)); for (i = 0; i < table_entries; i++) { unsigned char b[8]; url_fseek(pb, size + nsv->nsvs_file_offset[i], SEEK_SET); get_buffer(pb, b, 8); PRINT(("NSV [0x%08lx][0x%08lx]: %02x %02x %02x %02x %02x %02x %02x %02x" "%c%c%c%c%c%c%c%c\n", nsv->nsvs_file_offset[i], size + nsv->nsvs_file_offset[i], b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7], V(b[0]), V(b[1]), V(b[2]), V(b[3]), V(b[4]), V(b[5]), V(b[6]), V(b[7]) )); } //url_fseek(pb, size, SEEK_SET); /* go back to end of header */ #undef V #endif url_fseek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */ if (url_feof(pb)) return -1; nsv->state = NSV_HAS_READ_NSVF; return 0; } static int nsv_parse_NSVs_header(AVFormatContext *s, AVFormatParameters *ap) { NSVContext *nsv = s->priv_data; ByteIOContext *pb = s->pb; uint32_t vtag, atag; uint16_t vwidth, vheight; AVRational framerate; int i; AVStream *st; NSVStream *nst; PRINT(("%s()\n", __FUNCTION__)); vtag = get_le32(pb); atag = get_le32(pb); vwidth = get_le16(pb); vheight = get_le16(pb); i = get_byte(pb); PRINT(("NSV NSVs framerate code %2x\n", i)); if(i&0x80) { /* odd way of giving native framerates from docs */ int t=(i & 0x7F)>>2; if(t<16) framerate = (AVRational){1, t+1}; else framerate = (AVRational){t-15, 1}; if(i&1){ framerate.num *= 1000; framerate.den *= 1001; } if((i&3)==3) framerate.num *= 24; else if((i&3)==2) framerate.num *= 25; else framerate.num *= 30; } else framerate= (AVRational){i, 1}; nsv->avsync = get_le16(pb); nsv->framerate = framerate; #ifdef DEBUG print_tag("NSV NSVs vtag", vtag, 0); print_tag("NSV NSVs atag", atag, 0); PRINT(("NSV NSVs vsize %dx%d\n", vwidth, vheight)); #endif /* XXX change to ap != NULL ? */ if (s->nb_streams == 0) { /* streams not yet published, let's do that */ 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 = AVMEDIA_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 = AVMEDIA_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 ? AV_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 ? AV_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 (nsv->ahead[0].data) av_free_packet(&nsv->ahead[0]); if (nsv->ahead[1].data) av_free_packet(&nsv->ahead[1]); #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 (av_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, };