| /* |
| * 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" |
| #include "internal.h" |
| |
| #define MAX_AUDIO_SUBPACKETS 100 |
| |
| typedef struct VIV_SB_block { |
| int size, n_packets; |
| int64_t byte_offset; |
| int64_t 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; |
| int num_audio; |
| |
| 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; |
| |
| int64_t audio_sample; |
| |
| VIV_AudioSubpacket audio_subpackets[MAX_AUDIO_SUBPACKETS]; |
| } VividasDemuxContext; |
| |
| static int viv_probe(const AVProbeData *p) |
| { |
| if (memcmp(p->buf, "vividas03", 9)) |
| return 0; |
| |
| return AVPROBE_SCORE_MAX; |
| } |
| |
| static const uint8_t keybits[32] = { |
| 20, 52, 111, 10, 27, 71, 142, 53, |
| 82, 138, 1, 78, 86, 121, 183, 85, |
| 105, 152, 39, 140, 172, 11, 64, 144, |
| 155, 6, 71, 163, 186, 49, 126, 43, |
| }; |
| |
| static uint32_t decode_key(uint8_t *buf) |
| { |
| uint32_t key = 0; |
| |
| for (int i = 0; i < 32; i++) { |
| unsigned p = keybits[i]; |
| key |= ((buf[p] >> ((i*5+3)&7)) & 1u) << i; |
| } |
| |
| return key; |
| } |
| |
| static void put_v(uint8_t *p, unsigned 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 recover_key(unsigned char sample[4], unsigned expected_size) |
| { |
| unsigned char plaintext[8] = { 'S', 'B' }; |
| |
| put_v(plaintext+2, expected_size); |
| |
| return AV_RL32(sample) ^ AV_RL32(plaintext); |
| } |
| |
| static void xor_block(void *p1, void *p2, unsigned size, int key, unsigned *key_ptr) |
| { |
| unsigned *d1 = p1; |
| unsigned *d2 = p2; |
| unsigned k = *key_ptr; |
| |
| size >>= 2; |
| |
| while (size > 0) { |
| *d2 = *d1 ^ (HAVE_BIGENDIAN ? av_bswap32(k) : k); |
| k += key; |
| d1++; |
| d2++; |
| size--; |
| } |
| |
| *key_ptr = k; |
| } |
| |
| static void decode_block(uint8_t *src, uint8_t *dest, unsigned size, |
| uint32_t key, uint32_t *key_ptr, |
| int align) |
| { |
| unsigned s = size; |
| char tmp[4]; |
| int a2; |
| |
| if (!size) |
| return; |
| |
| align &= 3; |
| a2 = (4 - align) & 3; |
| |
| if (align) { |
| uint32_t tmpkey = *key_ptr - key; |
| if (a2 > s) { |
| a2 = s; |
| avpriv_request_sample(NULL, "tiny aligned block\n"); |
| } |
| memcpy(tmp + align, src, a2); |
| xor_block(tmp, tmp, 4, key, &tmpkey); |
| memcpy(dest, tmp + align, a2); |
| s -= a2; |
| } |
| |
| if (s >= 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, int len) |
| { |
| uint32_t v = 0; |
| const uint8_t *end = p + len; |
| |
| do { |
| if (p >= end || v >= UINT_MAX / 128 - *p) |
| return v; |
| 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, 4); |
| if (n < 4) |
| return NULL; |
| |
| 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); |
| } else { |
| av_free(buf); |
| buf = NULL; |
| } |
| |
| return buf; |
| } |
| |
| static uint8_t *read_sb_block(AVIOContext *src, unsigned *size, |
| uint32_t *key, unsigned expected_size) |
| { |
| uint8_t *buf; |
| uint8_t ibuf[8], sbuf[8]; |
| uint32_t k2; |
| unsigned 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, 6); |
| |
| 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, 6); |
| if (sbuf[0] != 'S' || sbuf[1] != 'B' || expected_size != n) |
| return NULL; |
| *key = tmpkey; |
| } |
| |
| if (n < 8) |
| return NULL; |
| |
| 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 int track_header(VividasDemuxContext *viv, AVFormatContext *s, uint8_t *buf, int size) |
| { |
| int i,j; |
| int64_t off; |
| int val_1; |
| int num_video; |
| AVIOContext *pb; |
| |
| pb = avio_alloc_context(buf, size, 0, NULL, NULL, NULL, NULL); |
| if (!pb) |
| return AVERROR(ENOMEM); |
| |
| 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++) { |
| if (avio_feof(pb)) |
| return AVERROR_EOF; |
| 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_ERROR, "number of video tracks %d is not 1\n", num_video); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| 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' |
| viv->num_audio = avio_r8(pb); |
| avio_seek(pb, off, SEEK_SET); |
| |
| if (viv->num_audio != 1) |
| av_log(s, AV_LOG_WARNING, "number of audio tracks %d is not 1\n", viv->num_audio); |
| |
| for(i=0;i<viv->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]; |
| int offset = 1; |
| uint8_t *p; |
| 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++) { |
| uint64_t len = ffio_read_varlen(pb); |
| if (len > INT_MAX/2 - xd_size) { |
| av_free(pb); |
| return AVERROR_INVALIDDATA; |
| } |
| data_len[j] = len; |
| xd_size += len; |
| } |
| |
| st->codecpar->extradata_size = 64 + xd_size + xd_size / 255; |
| if (ff_alloc_extradata(st->codecpar, st->codecpar->extradata_size)) { |
| av_free(pb); |
| return AVERROR(ENOMEM); |
| } |
| |
| p = st->codecpar->extradata; |
| p[0] = 2; |
| |
| for (j = 0; j < num_data - 1; j++) { |
| unsigned delta = av_xiphlacing(&p[offset], data_len[j]); |
| if (delta > data_len[j]) { |
| av_free(pb); |
| return AVERROR_INVALIDDATA; |
| } |
| offset += delta; |
| } |
| |
| for (j = 0; j < num_data; j++) { |
| int ret = avio_read(pb, &p[offset], data_len[j]); |
| if (ret < data_len[j]) { |
| st->codecpar->extradata_size = 0; |
| av_freep(&st->codecpar->extradata); |
| break; |
| } |
| offset += data_len[j]; |
| } |
| |
| if (offset < st->codecpar->extradata_size) |
| st->codecpar->extradata_size = offset; |
| } |
| } |
| |
| av_free(pb); |
| return 0; |
| } |
| |
| static int track_index(VividasDemuxContext *viv, AVFormatContext *s, uint8_t *buf, unsigned size) |
| { |
| int64_t off; |
| int64_t poff; |
| int maxnp=0; |
| AVIOContext *pb; |
| int i; |
| int64_t filesize = avio_size(s->pb); |
| |
| pb = avio_alloc_context(buf, size, 0, NULL, NULL, NULL, NULL); |
| if (!pb) |
| return AVERROR(ENOMEM); |
| |
| ffio_read_varlen(pb); // track_index_len |
| avio_r8(pb); // 'c' |
| viv->n_sb_blocks = ffio_read_varlen(pb); |
| if (viv->n_sb_blocks < 0 || viv->n_sb_blocks > size / 2) |
| goto error; |
| viv->sb_blocks = av_calloc(viv->n_sb_blocks, sizeof(VIV_SB_block)); |
| if (!viv->sb_blocks) { |
| viv->n_sb_blocks = 0; |
| av_free(pb); |
| return AVERROR(ENOMEM); |
| } |
| |
| off = 0; |
| poff = 0; |
| |
| for (i = 0; i < viv->n_sb_blocks; i++) { |
| uint64_t size_tmp = ffio_read_varlen(pb); |
| uint64_t n_packets_tmp = ffio_read_varlen(pb); |
| |
| if (size_tmp > INT_MAX || n_packets_tmp > INT_MAX) |
| goto error; |
| |
| viv->sb_blocks[i].byte_offset = off; |
| viv->sb_blocks[i].packet_offset = poff; |
| |
| viv->sb_blocks[i].size = size_tmp; |
| viv->sb_blocks[i].n_packets = n_packets_tmp; |
| |
| 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; |
| } |
| |
| if (filesize > 0 && poff > filesize) |
| goto error; |
| |
| viv->sb_entries = av_calloc(maxnp, sizeof(VIV_SB_entry)); |
| av_free(pb); |
| |
| return 0; |
| error: |
| av_free(pb); |
| viv->n_sb_blocks = 0; |
| av_freep(&viv->sb_blocks); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| static void load_sb_block(AVFormatContext *s, VividasDemuxContext *viv, unsigned 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; |
| int ret; |
| |
| 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); |
| if (avio_feof(pb) || block_len <= 0) |
| return AVERROR_INVALIDDATA; |
| |
| 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); |
| ret = track_header(viv, s, buf, v); |
| av_free(buf); |
| if (ret < 0) |
| return ret; |
| |
| buf = read_vblock(pb, &v, key, &k2, v); |
| if (!buf) |
| return AVERROR(EIO); |
| ret = track_index(viv, s, buf, v); |
| av_free(buf); |
| if (ret < 0) |
| return ret; |
| |
| 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; |
| int ret; |
| |
| if (!viv->sb_pb) |
| return AVERROR(EIO); |
| 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; |
| ret = av_get_packet(pb, pkt, size); |
| if (ret < 0) |
| return ret; |
| 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; |
| if (!pb) |
| return AVERROR(EIO); |
| off = avio_tell(pb); |
| off += viv->sb_entries[viv->current_sb_entry].size; |
| |
| if (viv->sb_entries[viv->current_sb_entry].flag == 0) { |
| uint64_t v_size = ffio_read_varlen(pb); |
| |
| if (!viv->num_audio) |
| return AVERROR_INVALIDDATA; |
| |
| ffio_read_varlen(pb); |
| if (v_size > INT_MAX) |
| return AVERROR_INVALIDDATA; |
| ret = av_get_packet(pb, pkt, v_size); |
| if (ret < 0) |
| return ret; |
| 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 (int 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; |
| |
| } else { |
| uint64_t v_size = ffio_read_varlen(pb); |
| |
| if (v_size > INT_MAX) |
| return AVERROR_INVALIDDATA; |
| ret = av_get_packet(pb, pkt, v_size); |
| if (ret < 0) |
| return ret; |
| 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++; |
| |
| 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; |
| int64_t frame; |
| |
| if (stream_index == 0) |
| frame = timestamp; |
| else |
| frame = av_rescale_q(timestamp, s->streams[0]->time_base, s->streams[stream_index]->time_base); |
| |
| for (int 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 = av_rescale_q(viv->sb_blocks[i].packet_offset, av_make_q(s->streams[1]->codecpar->sample_rate, 1), av_inv_q(s->streams[0]->time_base)); |
| // hand-tuned 1.s a/v offset |
| viv->audio_sample += s->streams[1]->codecpar->sample_rate; |
| 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, |
| }; |
