[FFmpeg-devel] [PATCH] avformat: add vividas demuxer

Paul B Mahol

2018-12-10 12:05:05 UTC

Signed-off-by: Paul B Mahol <***@gmail.com>
---
libavformat/Makefile | 1 +
libavformat/allformats.c | 1 +
libavformat/vividas.c | 708 +++++++++++++++++++++++++++++++++++++++
3 files changed, 710 insertions(+)
create mode 100644 libavformat/vividas.c

diff --git a/libavformat/Makefile b/libavformat/Makefile
index 0e43a12df5..c42ceb40c5 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -522,6 +522,7 @@ OBJS-$(CONFIG_VC1_DEMUXER) += rawdec.o vc1dec.o
OBJS-$(CONFIG_VC1_MUXER) += rawenc.o
OBJS-$(CONFIG_VC1T_DEMUXER) += vc1test.o
OBJS-$(CONFIG_VC1T_MUXER) += vc1testenc.o
+OBJS-$(CONFIG_VIVIDAS_DEMUXER) += vividas.o
OBJS-$(CONFIG_VIVO_DEMUXER) += vivo.o
OBJS-$(CONFIG_VMD_DEMUXER) += sierravmd.o
OBJS-$(CONFIG_VOBSUB_DEMUXER) += subtitles.o # mpeg demuxer is in the dependencies
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index df83b04484..399625fd78 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -422,6 +422,7 @@ extern AVInputFormat ff_vc1_demuxer;
extern AVOutputFormat ff_vc1_muxer;
extern AVInputFormat ff_vc1t_demuxer;
extern AVOutputFormat ff_vc1t_muxer;
+extern AVInputFormat ff_vividas_demuxer;
extern AVInputFormat ff_vivo_demuxer;
extern AVInputFormat ff_vmd_demuxer;
extern AVInputFormat ff_vobsub_demuxer;
diff --git a/libavformat/vividas.c b/libavformat/vividas.c
new file mode 100644
index 0000000000..86748dd780
--- /dev/null
+++ b/libavformat/vividas.c
@@ -0,0 +1,708 @@
+/*
+ * 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
+ */
+
+#include "libavutil/intreadwrite.h"
+#include "avio_internal.h"
+#include "avformat.h"
+
+#define MAX_AUDIO_SUBPACKETS 100
+
+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 VividasDemuxContext {
+ 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];
+} VividasDemuxContext;
+
+static int viv_probe(AVProbeData *p)
+{
+ if (memcmp(p->buf, "vividas03", 9))
+ return 0;
+
+ return AVPROBE_SCORE_MAX;
+}
+
+static 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;
+}
+
+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(VividasDemuxContext *viv, AVFormatContext *s, uint8_t *buf, int size)
+{
+ int i,j;
+ int64_t off;
+ int val_1;
+ int num_video, num_audio;
+ AVIOContext *pb;
+
+ pb = avio_alloc_context(buf, size, 0, NULL, NULL, NULL, NULL);
+ if (!pb)
+ return;
+
+ ffio_read_varlen(pb); // track_header_len
+ avio_r8(pb); // '1'
+
+ 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 += 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, "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);
+
+ st->id = i;
+
+ st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
+ st->codecpar->codec_id = AV_CODEC_ID_VP6;
+
+ off = avio_tell(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
+ st->codecpar->width = avio_rl16(pb); // width
+ st->codecpar->height = avio_rl16(pb); // height
+ avio_r8(pb); // val_8
+ avio_rl32(pb); // val_9
+
+ avio_seek(pb, off, SEEK_SET);
+ }
+
+ off = avio_tell(pb);
+ 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, "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);
+
+ st->id = num_video + i;
+
+ st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
+ st->codecpar->codec_id = AV_CODEC_ID_VORBIS;
+
+ off = avio_tell(pb);
+ off += ffio_read_varlen(pb); // length
+ avio_r8(pb); // '5'
+ avio_r8(pb); //codec_id
+ avio_rl16(pb); //codec_subid
+ st->codecpar->channels = avio_rl16(pb); // channels
+ st->codecpar->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;
+ ffio_read_varlen(pb); // val_13
+ avio_r8(pb); // '19'
+ ffio_read_varlen(pb); // len_3
+ num_data = avio_r8(pb);
+ for(j=0;j<num_data;j++) {
+ data_len[j] = ffio_read_varlen(pb);
+ xd_size += data_len[j];
+ }
+
+ st->codecpar->extradata_size = 64 + xd_size + xd_size / 255;
+ st->codecpar->extradata = (uint8_t*)av_mallocz(st->codecpar->extradata_size);
+
+ p = st->codecpar->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];
+ }
+
+ st->codecpar->extradata_size = offset;
+ }
+ }
+
+ av_free(pb);
+}
+
+static void track_index(VividasDemuxContext *viv, AVFormatContext *s, uint8_t *buf, int size)
+{
+ int i;
+ int64_t off;
+ int poff;
+ int maxnp=0;
+ AVIOContext *pb;
+
+ pb = avio_alloc_context(buf, size, 0, NULL, NULL, NULL, NULL);
+ if (!pb)
+ return;
+
+ ffio_read_varlen(pb); // track_index_len
+ avio_r8(pb); // 'c'
+ 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 = 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, VividasDemuxContext *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);
+ if (!pb)
+ return;
+
+ viv->sb_pb = pb;
+
+ avio_r8(pb); // 'S'
+ avio_r8(pb); // 'B'
+ ffio_read_varlen(pb); // size
+ avio_r8(pb); // junk
+ 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 = ffio_read_varlen(pb);
+ viv->sb_entries[i].flag = avio_r8(pb);
+ }
+
+ ffio_read_varlen(pb);
+ avio_r8(pb);
+
+ viv->current_sb_entry = 0;
+}
+
+static int viv_read_header(AVFormatContext *s)
+{
+ VividasDemuxContext *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;
+
+ avio_skip(pb, 9);
+
+ header_end = avio_tell(pb);
+
+ header_end += ffio_read_varlen(pb);
+
+ 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);
+
+ for (;;) {
+ int64_t here = avio_tell(pb);
+ int block_len, block_type;
+
+ if (here >= header_end)
+ break;
+
+ 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)
+{
+ VividasDemuxContext *viv = s->priv_data;
+ AVIOContext *pb;
+ int64_t off;
+
+ if (avio_feof(viv->sb_pb))
+ return AVERROR_EOF;
+
+ if (viv->current_audio_subpacket < viv->n_audio_subpackets) {
+ 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 = av_rescale(viv->audio_sample, astream->time_base.den, astream->time_base.num) / astream->codecpar->sample_rate;
+ viv->audio_sample += viv->audio_subpackets[viv->current_audio_subpacket].pcm_bytes / 2 / astream->codecpar->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) {
+ int i, v_size = ffio_read_varlen(pb);
+ 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 = 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 {
+ 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)
+{
+ VividasDemuxContext *viv = s->priv_data;
+
+ av_freep(&viv->sb_pb);
+ av_freep(&viv->sb_buf);
+ av_freep(&viv->sb_blocks);
+ av_freep(&viv->sb_entries);
+
+ return 0;
+}
+
+static int viv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
+{
+ VividasDemuxContext *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 * av_rescale(s->streams[1]->codecpar->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]->codecpar->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"),
+ .priv_data_size = sizeof(VividasDemuxContext),
+ .read_probe = viv_probe,
+ .read_header = viv_read_header,
+ .read_packet = viv_read_packet,
+ .read_close = viv_read_close,
+ .read_seek = viv_read_seek,
+ .flags = AVFMT_GLOBALHEADER,
+};

--
2.17.1