| /* |
| * NSV demuxer |
| * Copyright (c) 2004 The FFmpeg Project |
| * |
| * first version by Francois Revol <revol@free.fr> |
| * |
| * 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 "libavutil/attributes.h" |
| #include "libavutil/mathematics.h" |
| #include "avformat.h" |
| #include "internal.h" |
| #include "libavutil/dict.h" |
| #include "libavutil/intreadwrite.h" |
| |
| /* 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 |
| |
| /* |
| * 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 |
| */ |
| |
| #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; /* av_assert0(vwidth%16==0) */ |
| uint16_t vheight; /* av_assert0(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 NSVContext { |
| 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[] = { |
| { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') }, |
| { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') }, |
| { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') }, |
| { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') }, |
| { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') }, |
| { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') }, |
| { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') }, |
| { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') }, |
| { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') }, |
| { AV_CODEC_ID_VP8, MKTAG('V', 'P', '8', '0') }, |
| /* |
| { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') }, |
| { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') }, |
| */ |
| { AV_CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */ |
| { AV_CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') }, |
| { AV_CODEC_ID_NONE, 0 }, |
| }; |
| |
| static const AVCodecTag nsv_codec_audio_tags[] = { |
| { AV_CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') }, |
| { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') }, |
| { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') }, |
| { AV_CODEC_ID_AAC, MKTAG('V', 'L', 'B', ' ') }, |
| { AV_CODEC_ID_SPEEX, MKTAG('S', 'P', 'X', ' ') }, |
| { AV_CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') }, |
| { AV_CODEC_ID_NONE, 0 }, |
| }; |
| |
| //static int nsv_load_index(AVFormatContext *s); |
| static int nsv_read_chunk(AVFormatContext *s, int fill_header); |
| |
| #define print_tag(str, tag, size) \ |
| av_log(NULL, AV_LOG_TRACE, "%s: tag=%c%c%c%c\n", \ |
| str, tag & 0xff, \ |
| (tag >> 8) & 0xff, \ |
| (tag >> 16) & 0xff, \ |
| (tag >> 24) & 0xff); |
| |
| /* try to find something we recognize, and set the state accordingly */ |
| static int nsv_resync(AVFormatContext *s) |
| { |
| NSVContext *nsv = s->priv_data; |
| AVIOContext *pb = s->pb; |
| uint32_t v = 0; |
| int i; |
| |
| av_log(s, AV_LOG_TRACE, "%s(), offset = %"PRId64", state = %d\n", __FUNCTION__, avio_tell(pb), nsv->state); |
| |
| //nsv->state = NSV_UNSYNC; |
| |
| for (i = 0; i < NSV_MAX_RESYNC; i++) { |
| if (avio_feof(pb)) { |
| av_log(s, AV_LOG_TRACE, "NSV EOF\n"); |
| nsv->state = NSV_UNSYNC; |
| return -1; |
| } |
| v <<= 8; |
| v |= avio_r8(pb); |
| if (i < 8) { |
| av_log(s, AV_LOG_TRACE, "NSV resync: [%d] = %02x\n", i, v & 0x0FF); |
| } |
| |
| if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */ |
| av_log(s, AV_LOG_TRACE, "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 */ |
| av_log(s, AV_LOG_TRACE, "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 */ |
| av_log(s, AV_LOG_TRACE, "NSV resynced on NSVs after %d bytes\n", i+1); |
| nsv->state = NSV_FOUND_NSVS; |
| return 0; |
| } |
| |
| } |
| av_log(s, AV_LOG_TRACE, "NSV sync lost\n"); |
| return -1; |
| } |
| |
| static int nsv_parse_NSVf_header(AVFormatContext *s) |
| { |
| NSVContext *nsv = s->priv_data; |
| AVIOContext *pb = s->pb; |
| unsigned int av_unused file_size; |
| unsigned int size; |
| int64_t duration; |
| int strings_size; |
| int table_entries; |
| int table_entries_used; |
| |
| av_log(s, AV_LOG_TRACE, "%s()\n", __FUNCTION__); |
| |
| nsv->state = NSV_UNSYNC; /* in case we fail */ |
| |
| size = avio_rl32(pb); |
| if (size < 28) |
| return -1; |
| nsv->NSVf_end = size; |
| |
| //s->file_size = (uint32_t)avio_rl32(pb); |
| file_size = (uint32_t)avio_rl32(pb); |
| av_log(s, AV_LOG_TRACE, "NSV NSVf chunk_size %u\n", size); |
| av_log(s, AV_LOG_TRACE, "NSV NSVf file_size %u\n", file_size); |
| |
| nsv->duration = duration = avio_rl32(pb); /* in ms */ |
| av_log(s, AV_LOG_TRACE, "NSV NSVf duration %"PRId64" ms\n", duration); |
| // XXX: store it in AVStreams |
| |
| strings_size = avio_rl32(pb); |
| table_entries = avio_rl32(pb); |
| table_entries_used = avio_rl32(pb); |
| av_log(s, AV_LOG_TRACE, "NSV NSVf info-strings size: %d, table entries: %d, bis %d\n", |
| strings_size, table_entries, table_entries_used); |
| if (avio_feof(pb)) |
| return -1; |
| |
| av_log(s, AV_LOG_TRACE, "NSV got header; filepos %"PRId64"\n", avio_tell(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((size_t)strings_size + 1); |
| if (!p) |
| return AVERROR(ENOMEM); |
| endp = strings + strings_size; |
| avio_read(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'; |
| av_log(s, AV_LOG_TRACE, "NSV NSVf INFO: %s='%s'\n", token, value); |
| av_dict_set(&s->metadata, token, value, 0); |
| } |
| av_free(strings); |
| } |
| if (avio_feof(pb)) |
| return -1; |
| |
| av_log(s, AV_LOG_TRACE, "NSV got infos; filepos %"PRId64"\n", avio_tell(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_array((unsigned)table_entries_used, sizeof(uint32_t)); |
| if (!nsv->nsvs_file_offset) |
| return AVERROR(ENOMEM); |
| |
| for(i=0;i<table_entries_used;i++) |
| nsv->nsvs_file_offset[i] = avio_rl32(pb) + size; |
| |
| if(table_entries > table_entries_used && |
| avio_rl32(pb) == MKTAG('T','O','C','2')) { |
| nsv->nsvs_timestamps = av_malloc_array((unsigned)table_entries_used, sizeof(uint32_t)); |
| if (!nsv->nsvs_timestamps) |
| return AVERROR(ENOMEM); |
| for(i=0;i<table_entries_used;i++) { |
| nsv->nsvs_timestamps[i] = avio_rl32(pb); |
| } |
| } |
| } |
| |
| av_log(s, AV_LOG_TRACE, "NSV got index; filepos %"PRId64"\n", avio_tell(pb)); |
| |
| avio_seek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */ |
| |
| if (avio_feof(pb)) |
| return -1; |
| nsv->state = NSV_HAS_READ_NSVF; |
| return 0; |
| } |
| |
| static int nsv_parse_NSVs_header(AVFormatContext *s) |
| { |
| NSVContext *nsv = s->priv_data; |
| AVIOContext *pb = s->pb; |
| uint32_t vtag, atag; |
| uint16_t vwidth, vheight; |
| AVRational framerate; |
| int i; |
| AVStream *st; |
| NSVStream *nst; |
| av_log(s, AV_LOG_TRACE, "%s()\n", __FUNCTION__); |
| |
| vtag = avio_rl32(pb); |
| atag = avio_rl32(pb); |
| vwidth = avio_rl16(pb); |
| vheight = avio_rl16(pb); |
| i = avio_r8(pb); |
| |
| av_log(s, AV_LOG_TRACE, "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 = avio_rl16(pb); |
| nsv->framerate = framerate; |
| |
| print_tag("NSV NSVs vtag", vtag, 0); |
| print_tag("NSV NSVs atag", atag, 0); |
| av_log(s, AV_LOG_TRACE, "NSV NSVs vsize %dx%d\n", vwidth, vheight); |
| |
| /* 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 = avformat_new_stream(s, NULL); |
| if (!st) |
| goto fail; |
| |
| st->id = NSV_ST_VIDEO; |
| 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 */ |
| |
| avpriv_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) { |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| goto fail; |
| |
| st->id = NSV_ST_AUDIO; |
| 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 */ |
| avpriv_set_pts_info(st, 64, 1, framerate.num*1000); |
| st->start_time = 0; |
| st->duration = (int64_t)nsv->duration * framerate.num; |
| } |
| } else { |
| if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) { |
| av_log(s, AV_LOG_TRACE, "NSV NSVs header values differ from the first one!!!\n"); |
| //return -1; |
| } |
| } |
| |
| nsv->state = NSV_HAS_READ_NSVS; |
| return 0; |
| fail: |
| /* XXX */ |
| nsv->state = NSV_UNSYNC; |
| return -1; |
| } |
| |
| static int nsv_read_header(AVFormatContext *s) |
| { |
| NSVContext *nsv = s->priv_data; |
| int i, err; |
| |
| av_log(s, AV_LOG_TRACE, "%s()\n", __FUNCTION__); |
| av_log(s, AV_LOG_TRACE, "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); |
| if (err < 0) |
| return err; |
| } |
| /* we need the first NSVs also... */ |
| if (nsv->state == NSV_FOUND_NSVS) { |
| err = nsv_parse_NSVs_header(s); |
| if (err < 0) |
| return err; |
| 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); |
| |
| av_log(s, AV_LOG_TRACE, "parsed header\n"); |
| return err; |
| } |
| |
| static int nsv_read_chunk(AVFormatContext *s, int fill_header) |
| { |
| NSVContext *nsv = s->priv_data; |
| AVIOContext *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; |
| int ret; |
| |
| av_log(s, AV_LOG_TRACE, "%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 (avio_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); |
| if (err < 0) |
| return err; |
| if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF) |
| return -1; |
| |
| auxcount = avio_r8(pb); |
| vsize = avio_rl16(pb); |
| asize = avio_rl16(pb); |
| vsize = (vsize << 4) | (auxcount >> 4); |
| auxcount &= 0x0f; |
| av_log(s, AV_LOG_TRACE, "NSV CHUNK %d aux, %u bytes video, %d bytes audio\n", auxcount, vsize, asize); |
| /* skip aux stuff */ |
| for (i = 0; i < auxcount; i++) { |
| uint32_t av_unused auxtag; |
| auxsize = avio_rl16(pb); |
| auxtag = avio_rl32(pb); |
| av_log(s, AV_LOG_TRACE, "NSV aux data: '%c%c%c%c', %d bytes\n", |
| (auxtag & 0x0ff), |
| ((auxtag >> 8) & 0x0ff), |
| ((auxtag >> 16) & 0x0ff), |
| ((auxtag >> 24) & 0x0ff), |
| auxsize); |
| avio_skip(pb, auxsize); |
| vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming braindead */ |
| } |
| |
| if (avio_feof(pb)) |
| return -1; |
| if (!vsize && !asize) { |
| nsv->state = NSV_UNSYNC; |
| goto null_chunk_retry; |
| } |
| |
| /* map back streams to v,a */ |
| if (s->nb_streams > 0) |
| st[s->streams[0]->id] = s->streams[0]; |
| if (s->nb_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]; |
| if ((ret = av_get_packet(pb, pkt, vsize)) < 0) |
| return ret; |
| 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 < FFMIN(8, vsize); i++) |
| av_log(s, AV_LOG_TRACE, "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 = avio_r8(pb); |
| channels = avio_r8(pb); |
| samplerate = avio_rl16(pb); |
| if (!channels || !samplerate) |
| return AVERROR_INVALIDDATA; |
| asize-=4; |
| av_log(s, AV_LOG_TRACE, "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) { |
| av_log(s, AV_LOG_TRACE, "NSV AUDIO bit/sample != 16 (%d)!!!\n", bps); |
| } |
| bps /= channels; // ??? |
| if (bps == 8) |
| st[NSV_ST_AUDIO]->codec->codec_id = AV_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; |
| av_log(s, AV_LOG_TRACE, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate); |
| } |
| } |
| if ((ret = av_get_packet(pb, pkt, asize)) < 0) |
| return ret; |
| 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; |
| av_log(s, AV_LOG_TRACE, "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; |
| |
| av_log(s, AV_LOG_TRACE, "%s()\n", __FUNCTION__); |
| |
| /* in case we don't already have something to eat ... */ |
| if (!nsv->ahead[0].data && !nsv->ahead[1].data) |
| 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) { |
| av_log(s, AV_LOG_TRACE, "%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; |
| |
| if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0) |
| return -1; |
| |
| nst->frame_offset = st->index_entries[index].timestamp; |
| nsv->state = NSV_UNSYNC; |
| return 0; |
| } |
| |
| static int nsv_read_close(AVFormatContext *s) |
| { |
| NSVContext *nsv = s->priv_data; |
| |
| av_freep(&nsv->nsvs_file_offset); |
| av_freep(&nsv->nsvs_timestamps); |
| if (nsv->ahead[0].data) |
| av_packet_unref(&nsv->ahead[0]); |
| if (nsv->ahead[1].data) |
| av_packet_unref(&nsv->ahead[1]); |
| return 0; |
| } |
| |
| static int nsv_probe(AVProbeData *p) |
| { |
| int i, score = 0; |
| |
| /* 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 (AV_RL32(p->buf + i) == AV_RL32("NSVs")) { |
| /* Get the chunk size and check if at the end we are getting 0xBEEF */ |
| int vsize = AV_RL24(p->buf+i+19) >> 4; |
| int asize = AV_RL16(p->buf+i+22); |
| int offset = i + 23 + asize + vsize + 1; |
| if (offset <= p->buf_size - 2 && AV_RL16(p->buf + offset) == 0xBEEF) |
| return 4*AVPROBE_SCORE_MAX/5; |
| score = AVPROBE_SCORE_MAX/5; |
| } |
| } |
| /* so we'll have more luck on extension... */ |
| if (av_match_ext(p->filename, "nsv")) |
| return AVPROBE_SCORE_EXTENSION; |
| /* FIXME: add mime-type check */ |
| return score; |
| } |
| |
| AVInputFormat ff_nsv_demuxer = { |
| .name = "nsv", |
| .long_name = NULL_IF_CONFIG_SMALL("Nullsoft Streaming Video"), |
| .priv_data_size = sizeof(NSVContext), |
| .read_probe = nsv_probe, |
| .read_header = nsv_read_header, |
| .read_packet = nsv_read_packet, |
| .read_close = nsv_read_close, |
| .read_seek = nsv_read_seek, |
| }; |
