diff options
Diffstat (limited to 'ffmpeg1/libavformat/nsvdec.c')
| -rw-r--r-- | ffmpeg1/libavformat/nsvdec.c | 802 |
1 files changed, 802 insertions, 0 deletions
diff --git a/ffmpeg1/libavformat/nsvdec.c b/ffmpeg1/libavformat/nsvdec.c new file mode 100644 index 0000000..bcc2180 --- /dev/null +++ b/ffmpeg1/libavformat/nsvdec.c @@ -0,0 +1,802 @@ +/* + * 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 "libavutil/attributes.h" +#include "libavutil/mathematics.h" +#include "avformat.h" +#include "internal.h" +#include "libavutil/dict.h" +#include "libavutil/intreadwrite.h" + +//#define DEBUG_DUMP_INDEX // XXX dumbdriving-271.nsv breaks with it commented!! +#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 + */ + +#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_assert(vwidth%16==0) */ + uint16_t vheight; /* av_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[] = { + { 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_dlog(NULL, "%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_dlog(s, "%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 (url_feof(pb)) { + av_dlog(s, "NSV EOF\n"); + nsv->state = NSV_UNSYNC; + return -1; + } + v <<= 8; + v |= avio_r8(pb); + if (i < 8) { + av_dlog(s, "NSV resync: [%d] = %02x\n", i, v & 0x0FF); + } + + if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */ + av_dlog(s, "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_dlog(s, "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_dlog(s, "NSV resynced on NSVs after %d bytes\n", i+1); + nsv->state = NSV_FOUND_NSVS; + return 0; + } + + } + av_dlog(s, "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_dlog(s, "%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_dlog(s, "NSV NSVf chunk_size %u\n", size); + av_dlog(s, "NSV NSVf file_size %u\n", file_size); + + nsv->duration = duration = avio_rl32(pb); /* in ms */ + av_dlog(s, "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_dlog(s, "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; + + av_dlog(s, "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_dlog(s, "NSV NSVf INFO: %s='%s'\n", token, value); + av_dict_set(&s->metadata, token, value, 0); + } + av_free(strings); + } + if (url_feof(pb)) + return -1; + + av_dlog(s, "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((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((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_dlog(s, "NSV got index; filepos %"PRId64"\n", avio_tell(pb)); + +#ifdef DEBUG_DUMP_INDEX +#define V(v) ((v<0x20 || v > 127)?'.':v) + /* dump index */ + av_dlog(s, "NSV %d INDEX ENTRIES:\n", table_entries); + av_dlog(s, "NSV [dataoffset][fileoffset]\n", table_entries); + for (i = 0; i < table_entries; i++) { + unsigned char b[8]; + avio_seek(pb, size + nsv->nsvs_file_offset[i], SEEK_SET); + avio_read(pb, b, 8); + av_dlog(s, "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]) ); + } + //avio_seek(pb, size, SEEK_SET); /* go back to end of header */ +#undef V +#endif + + avio_seek(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) +{ + 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_dlog(s, "%s()\n", __FUNCTION__); + + vtag = avio_rl32(pb); + atag = avio_rl32(pb); + vwidth = avio_rl16(pb); + vheight = avio_rl16(pb); + i = avio_r8(pb); + + av_dlog(s, "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_dlog(s, "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) { +#ifndef DISABLE_AUDIO + 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; +#endif + } +#ifdef CHECK_SUBSEQUENT_NSVS + } else { + if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) { + av_dlog(s, "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) +{ + NSVContext *nsv = s->priv_data; + int i, err; + + av_dlog(s, "%s()\n", __FUNCTION__); + av_dlog(s, "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_dlog(s, "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; + + av_dlog(s, "%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); + 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_dlog(s, "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_dlog(s, "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 (url_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]; + 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 < FFMIN(8, vsize); i++) + av_dlog(s, "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); + asize-=4; + av_dlog(s, "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_dlog(s, "NSV AUDIO bit/sample != 16 (%d)!!!\n", bps); + } + if(channels) + bps /= channels; // ??? + else + av_log(s, AV_LOG_WARNING, "Channels is 0\n"); + 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_dlog(s, "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; + av_dlog(s, "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_dlog(s, "%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) { + av_dlog(s, "%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) +{ +/* 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, score = 0; + + av_dlog(NULL, "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 (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_MAX/2; + /* 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, +}; |