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Vividas demuxer which is compiling with FFmpeg 0.11
/*
* Vividas VIV format Demuxer
* Copyright (c) 2012 Krzysztof Klinikowski
* Copyright (c) 2010 Andrzej Szombierski
* based on vivparse Copyright (c) 2007 Måns Rullgård
*
* 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
*/
/**
* @file
* @brief Vividas VIV (.viv) file demuxer
* @author Andrzej Szombierski [qq at kuku eu org] (2010-07)
* @sa http://wiki.multimedia.cx/index.php?title=Vividas_VIV
*/
#define AV_PKT_FLAG_KEY 0x0001
#include "libavutil/intreadwrite.h"
#include "avio_internal.h"
#include "avformat.h"
#define MAX_AUDIO_SUBPACKETS 100
#define CODEC_TYPE_VIDEO AVMEDIA_TYPE_VIDEO
#define CODEC_TYPE_AUDIO AVMEDIA_TYPE_AUDIO
typedef struct VIV_SB_block {
int size, n_packets;
int64_t byte_offset;
int packet_offset;
} VIV_SB_block;
typedef struct VIV_SB_entry {
int size, flag;
} VIV_SB_entry;
typedef struct VIV_AudioSubpacket {
int start, pcm_bytes;
} VIV_AudioSubpacket;
typedef struct VIV_DemuxContext
{
int n_sb_blocks;
VIV_SB_block *sb_blocks;
uint32_t sb_key;
int64_t sb_offset;
int current_sb, current_sb_entry;
uint8_t *sb_buf;
AVIOContext *sb_pb;
int n_sb_entries;
VIV_SB_entry *sb_entries;
int n_audio_subpackets;
int current_audio_subpacket;
int audio_sample;
VIV_AudioSubpacket audio_subpackets[MAX_AUDIO_SUBPACKETS];
} VIV_DemuxContext;
static int viv_probe(AVProbeData *p)
{
if(strncmp((char*)p->buf, "vividas03", 9))
return 0;
return AVPROBE_SCORE_MAX;
}
const unsigned short keybits[32] = {
163, 416, 893, 82, 223, 572, 1137, 430,
659, 1104, 13, 626, 695, 972, 1465, 686,
843, 1216, 317, 1122, 1383, 92, 513, 1158,
1243, 48, 573, 1306, 1495, 396, 1009, 350,
};
static uint32_t decode_key(uint8_t *buf)
{
uint32_t key = 0;
int i;
for (i = 0; i < 32; i++) {
unsigned p = keybits[i];
key |= !!(buf[p>>3] & (1<<(p&7))) << i;
}
return key;
}
static void put_v(uint8_t *p, int v)
{
if(v>>28)
*p++ = ((v>>28)&0x7f)|0x80;
if(v>>21)
*p++ = ((v>>21)&0x7f)|0x80;
if(v>>14)
*p++ = ((v>>14)&0x7f)|0x80;
if(v>>7)
*p++ = ((v>>7)&0x7f)|0x80;
*p++ = v&0x7f;
}
static unsigned int recover_key(unsigned char sample[4], int expected_size)
{
unsigned char plaintext[8] = { 'S', 'B' };
put_v(plaintext+2, expected_size);
return (sample[0]^plaintext[0])|
((sample[1]^plaintext[1])<<8)|
((sample[2]^plaintext[2])<<16)|
((sample[3]^plaintext[3])<<24);
}
static void xor_block(void *p1, void *p2, int size, int key, int *key_ptr)
{
int *d1 = p1;
int *d2 = p2;
int k = *key_ptr;
size >>= 2;
while (size--) {
*d2 = *d1 ^ k;
k += key;
d1++;
d2++;
}
*key_ptr = k;
}
static void decode_block(uint8_t *src, uint8_t *dest, int size,
uint32_t key, uint32_t *key_ptr,
int align)
{
int s = size;
char tmp[4];
int a2;
if (!size)
return;
align &= 3;
a2 = (4 - align) & 3;
if (align) {
uint32_t tmpkey = *key_ptr - key;
memcpy(tmp + align, src, a2);
xor_block(tmp, tmp, 4, key, &tmpkey);
memcpy(dest, tmp + align, a2);
s -= a2;
}
if (s >= 4) {
if (!align)
align = 4;
xor_block(src + a2, dest + a2, s & ~3,
key, key_ptr);
s &= 3;
}
if (s) {
size -= s;
memcpy(tmp, src + size, s);
xor_block(&tmp, &tmp, 4, key, key_ptr);
memcpy(dest + size, tmp, s);
}
}
static uint32_t get_v(uint8_t *p)
{
uint32_t v = 0;
do {
v <<= 7;
v += *p & 0x7f;
} while (*p++ & 0x80);
return v;
}
static uint8_t *read_vblock(AVIOContext *src, uint32_t *size, uint32_t key, uint32_t *k2, int align)
{
uint8_t tmp[4];
uint8_t *buf;
unsigned n;
if(avio_read(src, tmp, 4) != 4)
return NULL;
decode_block(tmp, tmp, 4, key, k2, align);
n = get_v(tmp);
buf = av_malloc(n);
if (!buf)
return NULL;
*size = n;
n -= 4;
memcpy(buf, tmp, 4);
if (avio_read(src, buf + 4, n) == n) {
decode_block(buf + 4, buf + 4, n, key, k2, align + 4);
} else {
av_free(buf);
buf = NULL;
}
return buf;
}
static uint8_t *read_sb_block(AVIOContext *src, unsigned *size, uint32_t *key, int expected_size)
{
uint8_t *buf;
uint8_t ibuf[8], sbuf[8];
uint32_t k2;
int n;
if (avio_read(src, ibuf, 8) < 8)
return NULL;
k2 = *key;
decode_block(ibuf, sbuf, 8, *key, &k2, 0);
n = get_v(sbuf+2);
if (sbuf[0] != 'S' || sbuf[1] != 'B' || (expected_size>0 && n != expected_size)) {
uint32_t tmpkey = recover_key(ibuf, expected_size);
k2 = tmpkey;
decode_block(ibuf, sbuf, 8, tmpkey, &k2, 0);
n = get_v(sbuf+2);
if(sbuf[0] != 'S' || sbuf[1] != 'B' || expected_size != n)
return NULL;
*key = tmpkey;
}
buf = av_malloc(n);
if (!buf)
return NULL;
memcpy(buf, sbuf, 8);
*size = n;
n -= 8;
if (avio_read(src, buf+8, n) < n) {
av_free(buf);
return NULL;
}
decode_block(buf + 8, buf + 8, n, *key, &k2, 0);
return buf;
}
static void track_header(VIV_DemuxContext *viv, AVFormatContext *s, uint8_t *buf, int size)
{
int i,j;
int64_t off;
int val_1;
int num_video, num_audio;
AVIOContext *pb=0;
pb = avio_alloc_context(buf, size, 0, NULL, NULL, NULL, NULL);
//ff_get_v(pb); // track_header_len
ffio_read_varlen(pb); // track_header_len
avio_r8(pb); // '1'
//val_1 = ff_get_v(pb);
val_1 = ffio_read_varlen(pb);
for(i=0;i<val_1;i++) {
int c = avio_r8(pb);
for(j=0;j<c;j++) {
avio_r8(pb); // val_3
avio_r8(pb); // val_4
}
}
avio_r8(pb); // num_streams
off = avio_tell(pb);
//off += ff_get_v(pb); // val_5
off += ffio_read_varlen(pb); // val_5
avio_r8(pb); // '2'
num_video = avio_r8(pb);
avio_seek(pb, off, SEEK_SET);
if(num_video != 1)
av_log(s, AV_LOG_WARNING, "viv: number of video tracks %d is not 1\n", num_video);
for(i=0;i<num_video;i++) {
AVStream *st = avformat_new_stream(s, NULL);
AVCodecContext *vcodec = st->codec;
st->id = i;
vcodec->codec_type = CODEC_TYPE_VIDEO;
vcodec->codec_id = CODEC_ID_VP6;
off = avio_tell(pb);
//off += ff_get_v(pb);
off += ffio_read_varlen(pb);
avio_r8(pb); // '3'
avio_r8(pb); // val_7
st->time_base.num = avio_rl32(pb); // frame_time
st->time_base.den = avio_rl32(pb); // time_base
st->nb_frames = avio_rl32(pb); // n frames
vcodec->width = avio_rl16(pb); // width
vcodec->height = avio_rl16(pb); // height
avio_r8(pb); // val_8
avio_rl32(pb); // val_9
vcodec->flags |= CODEC_FLAG_GLOBAL_HEADER; // ?
avio_seek(pb, off, SEEK_SET);
}
off = avio_tell(pb);
//off += ff_get_v(pb); // val_10
off += ffio_read_varlen(pb); // val_10
avio_r8(pb); // '4'
num_audio = avio_r8(pb);
avio_seek(pb, off, SEEK_SET);
if(num_audio != 1)
av_log(s, AV_LOG_WARNING, "viv: number of audio tracks %d is not 1\n", num_audio);
for(i=0;i<num_audio;i++) {
int q;
AVStream *st = avformat_new_stream(s, NULL);
AVCodecContext *acodec = st->codec;
st->id = num_video + i;
acodec->codec_type = CODEC_TYPE_AUDIO;
acodec->codec_id = CODEC_ID_VORBIS;
acodec->flags |= CODEC_FLAG_GLOBAL_HEADER; // ?
off = avio_tell(pb);
//off += ff_get_v(pb); // length
off += ffio_read_varlen(pb); // length
avio_r8(pb); // '5'
avio_r8(pb); //codec_id
avio_rl16(pb); //codec_subid
acodec->channels = avio_rl16(pb); // channels
acodec->sample_rate = avio_rl32(pb); // sample_rate
avio_seek(pb, 10, SEEK_CUR); // data_1
q = avio_r8(pb);
avio_seek(pb, q, SEEK_CUR); // data_2
avio_r8(pb); // zeropad
if(avio_tell(pb) < off) {
int num_data;
int xd_size = 0;
int data_len[256];
uint8_t * p;
int offset = 1;
//ff_get_v(pb); // val_13
ffio_read_varlen(pb); // val_13
avio_r8(pb); // '19'
//ff_get_v(pb); // len_3
ffio_read_varlen(pb); // len_3
num_data = avio_r8(pb);
for(j=0;j<num_data;j++) {
//data_len[j] = ff_get_v(pb);
data_len[j] = ffio_read_varlen(pb);
xd_size += data_len[j];
}
acodec->extradata_size = 64 + xd_size + xd_size / 255;
acodec->extradata = (uint8_t*)av_mallocz(acodec->extradata_size);
p = acodec->extradata;
p[0] = 2;
for(j=0;j<num_data-1;j++)
offset += av_xiphlacing(&p[offset], data_len[j]);
for(j=0;j<num_data;j++) {
avio_read(pb, &p[offset], data_len[j]);
offset += data_len[j];
}
acodec->extradata_size = offset;
}
}
av_free(pb);
}
static void track_index(VIV_DemuxContext *viv, AVFormatContext *s, uint8_t *buf, int size)
{
int i;
int64_t off;
int poff;
int maxnp=0;
AVIOContext *pb=0;
pb = avio_alloc_context(buf, size, 0, NULL, NULL, NULL, NULL);
//ff_get_v(pb); // track_index_len
ffio_read_varlen(pb); // track_index_len
avio_r8(pb); // 'c'
//viv->n_sb_blocks = ff_get_v(pb);
viv->n_sb_blocks = ffio_read_varlen(pb);
viv->sb_blocks = av_mallocz(sizeof(VIV_SB_block) * viv->n_sb_blocks);
if(!viv->sb_blocks) {
viv->n_sb_blocks = 0;
av_free(pb);
return;
}
off = 0;
poff = 0;
for(i=0;i<viv->n_sb_blocks;i++) {
viv->sb_blocks[i].byte_offset = off;
viv->sb_blocks[i].packet_offset = poff;
//viv->sb_blocks[i].size = ff_get_v(pb);
//viv->sb_blocks[i].n_packets = ff_get_v(pb);
viv->sb_blocks[i].size = ffio_read_varlen(pb);
viv->sb_blocks[i].n_packets = ffio_read_varlen(pb);
off += viv->sb_blocks[i].size;
poff += viv->sb_blocks[i].n_packets;
if(maxnp < viv->sb_blocks[i].n_packets)
maxnp = viv->sb_blocks[i].n_packets;
}
viv->sb_entries = av_mallocz(maxnp * sizeof(VIV_SB_entry));
av_free(pb);
}
static void load_sb_block(AVFormatContext *s, VIV_DemuxContext *viv, int expected_size)
{
uint32_t size=0;
int i;
AVIOContext *pb = 0;
if(viv->sb_pb) {
av_free(viv->sb_pb);
viv->sb_pb = NULL;
}
if(viv->sb_buf)
av_free(viv->sb_buf);
viv->sb_buf = read_sb_block(s->pb, &size, &viv->sb_key, expected_size);
if(!viv->sb_buf) {
return;
}
pb = avio_alloc_context(viv->sb_buf, size, 0, NULL, NULL, NULL, NULL);
viv->sb_pb = pb;
avio_r8(pb); // 'S'
avio_r8(pb); // 'B'
//ff_get_v(pb); // size
ffio_read_varlen(pb); // size
avio_r8(pb); // junk
//ff_get_v(pb); // first packet
ffio_read_varlen(pb); // first packet
viv->n_sb_entries = viv->sb_blocks[viv->current_sb].n_packets;
for(i=0;i<viv->n_sb_entries;i++) {
//viv->sb_entries[i].size = ff_get_v(pb);
viv->sb_entries[i].size = ffio_read_varlen(pb);
viv->sb_entries[i].flag = avio_r8(pb);
}
//ff_get_v(pb); // 0
ffio_read_varlen(pb); // 0
avio_r8(pb); // 0
viv->current_sb_entry = 0;
}
static int viv_read_header(AVFormatContext *s)
{
VIV_DemuxContext *viv = s->priv_data;
AVIOContext *pb = s->pb;
int64_t header_end;
int num_tracks;
uint32_t key, k2;
uint32_t v;
uint8_t keybuffer[187];
uint32_t b22_size = 0;
uint32_t b22_key = 0;
uint8_t *buf = 0;
// string "vividas03"
avio_seek(pb, 9, SEEK_CUR);
header_end = avio_tell(pb);
// v: header size
//header_end += ff_get_v(pb);
header_end += ffio_read_varlen(pb);
// u8: n tracks
num_tracks = avio_r8(pb);
if(num_tracks != 1) {
av_log(s, AV_LOG_ERROR, "number of tracks %d is not 1\n", num_tracks);
return AVERROR(EINVAL);
}
v = avio_r8(pb);
avio_seek(pb, v, SEEK_CUR);
avio_read(pb, keybuffer, 187);
key = decode_key(keybuffer);
viv->sb_key = key;
avio_rl32(pb); // track_header_len
for(;;) {
int64_t here = avio_tell(pb);
int block_len, block_type;
if(here >= header_end)
break;
//block_len = ff_get_v(pb);
block_len = ffio_read_varlen(pb);
block_type = avio_r8(pb);
if(block_type == 22) {
avio_read(pb, keybuffer, 187);
b22_key = decode_key(keybuffer);
b22_size = avio_rl32(pb);
}
avio_seek(pb, here + block_len, SEEK_SET);
}
if(b22_size) {
k2 = b22_key;
buf = read_vblock(pb, &v, b22_key, &k2, 0);
if(!buf)
return AVERROR(EIO);
av_free(buf);
}
k2 = key;
buf = read_vblock(pb, &v, key, &k2, 0);
if(!buf)
return AVERROR(EIO);
track_header(viv, s, buf, v);
av_free(buf);
buf = read_vblock(pb, &v, key, &k2, v);
if(!buf)
return AVERROR(EIO);
track_index(viv, s, buf, v);
av_free(buf);
viv->sb_offset = avio_tell(pb);
if(viv->n_sb_blocks > 0) {
viv->current_sb = 0;
load_sb_block(s, viv, viv->sb_blocks[0].size);
} else {
viv->current_sb = -1;
}
return 0;
}
static int viv_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
VIV_DemuxContext *viv = s->priv_data;
AVIOContext *pb;
int64_t off;
if(viv->current_audio_subpacket < viv->n_audio_subpackets) {
// audio packets
AVStream *astream;
int size = viv->audio_subpackets[viv->current_audio_subpacket+1].start - viv->audio_subpackets[viv->current_audio_subpacket].start;
pb = viv->sb_pb;
av_get_packet(pb, pkt, size);
pkt->pos += viv->sb_offset + viv->sb_blocks[viv->current_sb].byte_offset;
pkt->stream_index = 1;
astream = s->streams[pkt->stream_index];
pkt->pts = viv->audio_sample * (long long)astream->time_base.den / (long long)astream->time_base.num / (long long)astream->codec->sample_rate;
viv->audio_sample += viv->audio_subpackets[viv->current_audio_subpacket].pcm_bytes / 2 / astream->codec->channels;
pkt->flags |= AV_PKT_FLAG_KEY;
viv->current_audio_subpacket++;
return 0;
}
if(viv->current_sb_entry >= viv->n_sb_entries) {
if(viv->current_sb+1 >= viv->n_sb_blocks)
return AVERROR(EIO);
viv->current_sb++;
load_sb_block(s, viv, 0);
viv->current_sb_entry = 0;
}
pb = viv->sb_pb;
off = avio_tell(pb);
off += viv->sb_entries[viv->current_sb_entry].size;
if(viv->sb_entries[viv->current_sb_entry].flag == 0) {
// A/V packet
int i;
//int v_size = ff_get_v(pb);
int v_size = ffio_read_varlen(pb);
///*int a_size = */ff_get_v(pb);
/*int a_size = */ffio_read_varlen(pb);
av_get_packet(pb, pkt, v_size);
pkt->pos += viv->sb_offset + viv->sb_blocks[viv->current_sb].byte_offset;
pkt->pts = viv->sb_blocks[viv->current_sb].packet_offset + viv->current_sb_entry;
pkt->flags |= (pkt->data[0]&0x80)?0:AV_PKT_FLAG_KEY;
pkt->stream_index = 0;
for(i=0;i<MAX_AUDIO_SUBPACKETS-1;i++) {
int start, pcm_bytes;
//start = ff_get_v(pb);
//pcm_bytes = ff_get_v(pb);
start = ffio_read_varlen(pb);
pcm_bytes = ffio_read_varlen(pb);
if(i > 0 && start == 0)
break;
viv->n_audio_subpackets = i+1;
viv->audio_subpackets[i].start = start;
viv->audio_subpackets[i].pcm_bytes = pcm_bytes;
}
viv->audio_subpackets[viv->n_audio_subpackets].start = (int)(off - avio_tell(pb));
viv->current_audio_subpacket = 0;
//viv->n_audio_subpackets = 0;
//avio_seek(pb, off, SEEK_SET);
} else {
// V packet
//int v_size = ff_get_v(pb);
int v_size = ffio_read_varlen(pb);
av_get_packet(pb, pkt, v_size);
pkt->pos += viv->sb_offset + viv->sb_blocks[viv->current_sb].byte_offset;
pkt->pts = viv->sb_blocks[viv->current_sb].packet_offset + viv->current_sb_entry;
pkt->flags |= (pkt->data[0]&0x80)?0:AV_PKT_FLAG_KEY;
pkt->stream_index = 0;
}
viv->current_sb_entry++;
// avio_seek(pb, off, SEEK_SET);
return 0;
}
static int viv_read_close(AVFormatContext *s)
{
VIV_DemuxContext *viv = s->priv_data;
if(viv->sb_pb)
av_free(viv->sb_pb);
if(viv->sb_buf)
av_free(viv->sb_buf);
if(viv->sb_blocks)
av_free(viv->sb_blocks);
if(viv->sb_entries)
av_free(viv->sb_entries);
return 0;
}
static int viv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
{
VIV_DemuxContext *viv = s->priv_data;
int frame = 0;
int i;
if(stream_index == 0)
frame = (int)timestamp;
else
frame = (int)timestamp * s->streams[stream_index]->time_base.den * s->streams[0]->time_base.num / s->streams[stream_index]->time_base.num / s->streams[0]->time_base.den;
for(i=0;i<viv->n_sb_blocks;i++) {
if(frame >= viv->sb_blocks[i].packet_offset && frame < viv->sb_blocks[i].packet_offset + viv->sb_blocks[i].n_packets) {
// flush audio packet queue
viv->current_audio_subpacket = 0;
viv->n_audio_subpackets = 0;
viv->current_sb = i;
// seek to ith sb block
avio_seek(s->pb, viv->sb_offset + viv->sb_blocks[i].byte_offset, SEEK_SET);
// load the block
load_sb_block(s, viv, 0);
// most problematic part: guess audio offset
viv->audio_sample = (int64_t)viv->sb_blocks[i].packet_offset * (int64_t)s->streams[1]->codec->sample_rate * s->streams[0]->time_base.num / s->streams[0]->time_base.den;
// hand-tuned 1.3s a/v offset
viv->audio_sample += 1300 * s->streams[1]->codec->sample_rate / 1000;
viv->current_sb_entry = 0;
return 1;
}
}
return 0;
}
AVInputFormat ff_vividas_demuxer = {
.name = "vividas",
.long_name = NULL_IF_CONFIG_SMALL("Vividas VIV format"),
.priv_data_size = sizeof(VIV_DemuxContext),
.read_probe = viv_probe,
.read_header = viv_read_header,
.read_packet = viv_read_packet,
.read_close = viv_read_close,
.read_seek = viv_read_seek
};
@tzok

Czy to działa z ffmpeg 1:1.0.1? Pierwszy raz zmieniam cokolwiek w ffmpeg i nie mogę dojść z tym do ładu niestety...

Dodałem powyższą zawartość do pliku vividas.c w katalogu libavformat, dopisałem też w tamtejszym Makefile do OBJS wpis vividas.o. Wydaje się, że rekompilacja zadziałała - plik vividas.o powstał oraz miałem info, że przegenerowane zostało kilka libów (w tym libavformat.so).

Ale wywołanie "ffmpeg -formats" nie pokazuje mi wcale vividas jako obsługiwanego no i oczywiście nie mogę otwierać plików .viv. Sprawdziłem przy pomocy narzędzia ldd, że uruchamiany ffmpeg na pewno korzysta z nowoskompilowanych bibliotek, a nie z systemowych.

Co jeszcze mógłbym sprawdzić?
Z góry dzięki za pomoc!
tzok

@wmyrda

powinno działać, gdyż tyle co sprawdziłem z wersją 1.0.3 i funkcjonuje poprawnie. Panowie nie myślicie by spróbować ten kod dodać to samego ffmpeg przez ich mailistę czy inne sposób w jaki przyjmują patche?

Patch do wersji 1.0.3
http://pastebin.com/9bwHUJF2

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