| /* |
| * "NUT" Container Format demuxer |
| * Copyright (c) 2004-2006 Michael Niedermayer |
| * Copyright (c) 2003 Alex Beregszaszi |
| * |
| * 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/avstring.h" |
| #include "libavutil/avassert.h" |
| #include "libavutil/bswap.h" |
| #include "libavutil/dict.h" |
| #include "libavutil/intreadwrite.h" |
| #include "libavutil/mathematics.h" |
| #include "libavutil/tree.h" |
| #include "libavcodec/bytestream.h" |
| #include "avio_internal.h" |
| #include "isom.h" |
| #include "nut.h" |
| #include "riff.h" |
| |
| #define NUT_MAX_STREAMS 256 /* arbitrary sanity check value */ |
| |
| static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, |
| int64_t *pos_arg, int64_t pos_limit); |
| |
| static int get_str(AVIOContext *bc, char *string, unsigned int maxlen) |
| { |
| unsigned int len = ffio_read_varlen(bc); |
| |
| if (len && maxlen) |
| avio_read(bc, string, FFMIN(len, maxlen)); |
| while (len > maxlen) { |
| avio_r8(bc); |
| len--; |
| if (bc->eof_reached) |
| len = maxlen; |
| } |
| |
| if (maxlen) |
| string[FFMIN(len, maxlen - 1)] = 0; |
| |
| if (bc->eof_reached) |
| return AVERROR_EOF; |
| if (maxlen == len) |
| return -1; |
| else |
| return 0; |
| } |
| |
| static int64_t get_s(AVIOContext *bc) |
| { |
| int64_t v = ffio_read_varlen(bc) + 1; |
| |
| if (v & 1) |
| return -(v >> 1); |
| else |
| return (v >> 1); |
| } |
| |
| static uint64_t get_fourcc(AVIOContext *bc) |
| { |
| unsigned int len = ffio_read_varlen(bc); |
| |
| if (len == 2) |
| return avio_rl16(bc); |
| else if (len == 4) |
| return avio_rl32(bc); |
| else { |
| av_log(NULL, AV_LOG_ERROR, "Unsupported fourcc length %d\n", len); |
| return -1; |
| } |
| } |
| |
| static int get_packetheader(NUTContext *nut, AVIOContext *bc, |
| int calculate_checksum, uint64_t startcode) |
| { |
| int64_t size; |
| |
| startcode = av_be2ne64(startcode); |
| startcode = ff_crc04C11DB7_update(0, (uint8_t*) &startcode, 8); |
| |
| ffio_init_checksum(bc, ff_crc04C11DB7_update, startcode); |
| size = ffio_read_varlen(bc); |
| if (size > 4096) |
| avio_rb32(bc); |
| if (ffio_get_checksum(bc) && size > 4096) |
| return -1; |
| |
| ffio_init_checksum(bc, calculate_checksum ? ff_crc04C11DB7_update : NULL, 0); |
| |
| return size; |
| } |
| |
| static uint64_t find_any_startcode(AVIOContext *bc, int64_t pos) |
| { |
| uint64_t state = 0; |
| |
| if (pos >= 0) |
| /* Note, this may fail if the stream is not seekable, but that should |
| * not matter, as in this case we simply start where we currently are */ |
| avio_seek(bc, pos, SEEK_SET); |
| while (!avio_feof(bc)) { |
| state = (state << 8) | avio_r8(bc); |
| if ((state >> 56) != 'N') |
| continue; |
| switch (state) { |
| case MAIN_STARTCODE: |
| case STREAM_STARTCODE: |
| case SYNCPOINT_STARTCODE: |
| case INFO_STARTCODE: |
| case INDEX_STARTCODE: |
| return state; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * Find the given startcode. |
| * @param code the startcode |
| * @param pos the start position of the search, or -1 if the current position |
| * @return the position of the startcode or -1 if not found |
| */ |
| static int64_t find_startcode(AVIOContext *bc, uint64_t code, int64_t pos) |
| { |
| for (;;) { |
| uint64_t startcode = find_any_startcode(bc, pos); |
| if (startcode == code) |
| return avio_tell(bc) - 8; |
| else if (startcode == 0) |
| return -1; |
| pos = -1; |
| } |
| } |
| |
| static int nut_probe(const AVProbeData *p) |
| { |
| int i; |
| |
| for (i = 0; i < p->buf_size-8; i++) { |
| if (AV_RB32(p->buf+i) != MAIN_STARTCODE>>32) |
| continue; |
| if (AV_RB32(p->buf+i+4) == (MAIN_STARTCODE & 0xFFFFFFFF)) |
| return AVPROBE_SCORE_MAX; |
| } |
| return 0; |
| } |
| |
| #define GET_V(dst, check) \ |
| do { \ |
| tmp = ffio_read_varlen(bc); \ |
| if (!(check)) { \ |
| av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp); \ |
| ret = AVERROR_INVALIDDATA; \ |
| goto fail; \ |
| } \ |
| dst = tmp; \ |
| } while (0) |
| |
| static int skip_reserved(AVIOContext *bc, int64_t pos) |
| { |
| pos -= avio_tell(bc); |
| if (pos < 0) { |
| avio_seek(bc, pos, SEEK_CUR); |
| return AVERROR_INVALIDDATA; |
| } else { |
| while (pos--) { |
| if (bc->eof_reached) |
| return AVERROR_INVALIDDATA; |
| avio_r8(bc); |
| } |
| return 0; |
| } |
| } |
| |
| static int decode_main_header(NUTContext *nut) |
| { |
| AVFormatContext *s = nut->avf; |
| AVIOContext *bc = s->pb; |
| uint64_t tmp, end; |
| unsigned int stream_count; |
| int i, j, count, ret; |
| int tmp_stream, tmp_mul, tmp_pts, tmp_size, tmp_res, tmp_head_idx; |
| |
| end = get_packetheader(nut, bc, 1, MAIN_STARTCODE); |
| end += avio_tell(bc); |
| |
| nut->version = ffio_read_varlen(bc); |
| if (nut->version < NUT_MIN_VERSION || |
| nut->version > NUT_MAX_VERSION) { |
| av_log(s, AV_LOG_ERROR, "Version %d not supported.\n", |
| nut->version); |
| return AVERROR(ENOSYS); |
| } |
| if (nut->version > 3) |
| nut->minor_version = ffio_read_varlen(bc); |
| |
| GET_V(stream_count, tmp > 0 && tmp <= NUT_MAX_STREAMS); |
| |
| nut->max_distance = ffio_read_varlen(bc); |
| if (nut->max_distance > 65536) { |
| av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance); |
| nut->max_distance = 65536; |
| } |
| |
| GET_V(nut->time_base_count, tmp > 0 && tmp < INT_MAX / sizeof(AVRational)); |
| nut->time_base = av_malloc_array(nut->time_base_count, sizeof(AVRational)); |
| if (!nut->time_base) |
| return AVERROR(ENOMEM); |
| |
| for (i = 0; i < nut->time_base_count; i++) { |
| GET_V(nut->time_base[i].num, tmp > 0 && tmp < (1ULL << 31)); |
| GET_V(nut->time_base[i].den, tmp > 0 && tmp < (1ULL << 31)); |
| if (av_gcd(nut->time_base[i].num, nut->time_base[i].den) != 1) { |
| av_log(s, AV_LOG_ERROR, "invalid time base %d/%d\n", |
| nut->time_base[i].num, |
| nut->time_base[i].den); |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| } |
| tmp_pts = 0; |
| tmp_mul = 1; |
| tmp_stream = 0; |
| tmp_head_idx = 0; |
| for (i = 0; i < 256;) { |
| int tmp_flags = ffio_read_varlen(bc); |
| int tmp_fields = ffio_read_varlen(bc); |
| |
| if (tmp_fields > 0) |
| tmp_pts = get_s(bc); |
| if (tmp_fields > 1) |
| tmp_mul = ffio_read_varlen(bc); |
| if (tmp_fields > 2) |
| tmp_stream = ffio_read_varlen(bc); |
| if (tmp_fields > 3) |
| tmp_size = ffio_read_varlen(bc); |
| else |
| tmp_size = 0; |
| if (tmp_fields > 4) |
| tmp_res = ffio_read_varlen(bc); |
| else |
| tmp_res = 0; |
| if (tmp_fields > 5) |
| count = ffio_read_varlen(bc); |
| else |
| count = tmp_mul - tmp_size; |
| if (tmp_fields > 6) |
| get_s(bc); |
| if (tmp_fields > 7) |
| tmp_head_idx = ffio_read_varlen(bc); |
| |
| while (tmp_fields-- > 8) { |
| if (bc->eof_reached) { |
| av_log(s, AV_LOG_ERROR, "reached EOF while decoding main header\n"); |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| ffio_read_varlen(bc); |
| } |
| |
| if (count <= 0 || count > 256 - (i <= 'N') - i) { |
| av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i); |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| if (tmp_stream >= stream_count) { |
| av_log(s, AV_LOG_ERROR, "illegal stream number %d >= %d\n", |
| tmp_stream, stream_count); |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| |
| for (j = 0; j < count; j++, i++) { |
| if (i == 'N') { |
| nut->frame_code[i].flags = FLAG_INVALID; |
| j--; |
| continue; |
| } |
| nut->frame_code[i].flags = tmp_flags; |
| nut->frame_code[i].pts_delta = tmp_pts; |
| nut->frame_code[i].stream_id = tmp_stream; |
| nut->frame_code[i].size_mul = tmp_mul; |
| nut->frame_code[i].size_lsb = tmp_size + j; |
| nut->frame_code[i].reserved_count = tmp_res; |
| nut->frame_code[i].header_idx = tmp_head_idx; |
| } |
| } |
| av_assert0(nut->frame_code['N'].flags == FLAG_INVALID); |
| |
| if (end > avio_tell(bc) + 4) { |
| int rem = 1024; |
| GET_V(nut->header_count, tmp < 128U); |
| nut->header_count++; |
| for (i = 1; i < nut->header_count; i++) { |
| uint8_t *hdr; |
| GET_V(nut->header_len[i], tmp > 0 && tmp < 256); |
| if (rem < nut->header_len[i]) { |
| av_log(s, AV_LOG_ERROR, |
| "invalid elision header %d : %d > %d\n", |
| i, nut->header_len[i], rem); |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| rem -= nut->header_len[i]; |
| hdr = av_malloc(nut->header_len[i]); |
| if (!hdr) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| avio_read(bc, hdr, nut->header_len[i]); |
| nut->header[i] = hdr; |
| } |
| av_assert0(nut->header_len[0] == 0); |
| } |
| |
| // flags had been effectively introduced in version 4 |
| if (nut->version > 3 && end > avio_tell(bc) + 4) { |
| nut->flags = ffio_read_varlen(bc); |
| } |
| |
| if (skip_reserved(bc, end) || ffio_get_checksum(bc)) { |
| av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n"); |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| |
| nut->stream = av_calloc(stream_count, sizeof(StreamContext)); |
| if (!nut->stream) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| for (i = 0; i < stream_count; i++) |
| avformat_new_stream(s, NULL); |
| |
| return 0; |
| fail: |
| av_freep(&nut->time_base); |
| for (i = 1; i < nut->header_count; i++) { |
| av_freep(&nut->header[i]); |
| } |
| nut->header_count = 0; |
| return ret; |
| } |
| |
| static int decode_stream_header(NUTContext *nut) |
| { |
| AVFormatContext *s = nut->avf; |
| AVIOContext *bc = s->pb; |
| StreamContext *stc; |
| int class, stream_id, ret; |
| uint64_t tmp, end; |
| AVStream *st = NULL; |
| |
| end = get_packetheader(nut, bc, 1, STREAM_STARTCODE); |
| end += avio_tell(bc); |
| |
| GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base); |
| stc = &nut->stream[stream_id]; |
| st = s->streams[stream_id]; |
| if (!st) |
| return AVERROR(ENOMEM); |
| |
| class = ffio_read_varlen(bc); |
| tmp = get_fourcc(bc); |
| st->codecpar->codec_tag = tmp; |
| switch (class) { |
| case 0: |
| st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
| st->codecpar->codec_id = av_codec_get_id((const AVCodecTag * const []) { |
| ff_nut_video_tags, |
| ff_codec_bmp_tags, |
| ff_codec_movvideo_tags, |
| 0 |
| }, |
| tmp); |
| break; |
| case 1: |
| st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| st->codecpar->codec_id = av_codec_get_id((const AVCodecTag * const []) { |
| ff_nut_audio_tags, |
| ff_codec_wav_tags, |
| ff_nut_audio_extra_tags, |
| 0 |
| }, |
| tmp); |
| break; |
| case 2: |
| st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE; |
| st->codecpar->codec_id = ff_codec_get_id(ff_nut_subtitle_tags, tmp); |
| break; |
| case 3: |
| st->codecpar->codec_type = AVMEDIA_TYPE_DATA; |
| st->codecpar->codec_id = ff_codec_get_id(ff_nut_data_tags, tmp); |
| break; |
| default: |
| av_log(s, AV_LOG_ERROR, "unknown stream class (%d)\n", class); |
| return AVERROR(ENOSYS); |
| } |
| if (class < 3 && st->codecpar->codec_id == AV_CODEC_ID_NONE) |
| av_log(s, AV_LOG_ERROR, |
| "Unknown codec tag '0x%04x' for stream number %d\n", |
| (unsigned int) tmp, stream_id); |
| |
| GET_V(stc->time_base_id, tmp < nut->time_base_count); |
| GET_V(stc->msb_pts_shift, tmp < 16); |
| stc->max_pts_distance = ffio_read_varlen(bc); |
| GET_V(stc->decode_delay, tmp < 1000); // sanity limit, raise this if Moore's law is true |
| st->codecpar->video_delay = stc->decode_delay; |
| ffio_read_varlen(bc); // stream flags |
| |
| GET_V(st->codecpar->extradata_size, tmp < (1 << 30)); |
| if (st->codecpar->extradata_size) { |
| ret = ff_get_extradata(s, st->codecpar, bc, |
| st->codecpar->extradata_size); |
| if (ret < 0) |
| return ret; |
| } |
| |
| if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) { |
| GET_V(st->codecpar->width, tmp > 0); |
| GET_V(st->codecpar->height, tmp > 0); |
| st->sample_aspect_ratio.num = ffio_read_varlen(bc); |
| st->sample_aspect_ratio.den = ffio_read_varlen(bc); |
| if ((!st->sample_aspect_ratio.num) != (!st->sample_aspect_ratio.den)) { |
| av_log(s, AV_LOG_ERROR, "invalid aspect ratio %d/%d\n", |
| st->sample_aspect_ratio.num, st->sample_aspect_ratio.den); |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| ffio_read_varlen(bc); /* csp type */ |
| } else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) { |
| GET_V(st->codecpar->sample_rate, tmp > 0); |
| ffio_read_varlen(bc); // samplerate_den |
| GET_V(st->codecpar->channels, tmp > 0); |
| } |
| if (skip_reserved(bc, end) || ffio_get_checksum(bc)) { |
| av_log(s, AV_LOG_ERROR, |
| "stream header %d checksum mismatch\n", stream_id); |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| stc->time_base = &nut->time_base[stc->time_base_id]; |
| avpriv_set_pts_info(s->streams[stream_id], 63, stc->time_base->num, |
| stc->time_base->den); |
| return 0; |
| fail: |
| if (st && st->codecpar) { |
| av_freep(&st->codecpar->extradata); |
| st->codecpar->extradata_size = 0; |
| } |
| return ret; |
| } |
| |
| static void set_disposition_bits(AVFormatContext *avf, char *value, |
| int stream_id) |
| { |
| int flag = 0, i; |
| |
| for (i = 0; ff_nut_dispositions[i].flag; ++i) |
| if (!strcmp(ff_nut_dispositions[i].str, value)) |
| flag = ff_nut_dispositions[i].flag; |
| if (!flag) |
| av_log(avf, AV_LOG_INFO, "unknown disposition type '%s'\n", value); |
| for (i = 0; i < avf->nb_streams; ++i) |
| if (stream_id == i || stream_id == -1) |
| avf->streams[i]->disposition |= flag; |
| } |
| |
| static int decode_info_header(NUTContext *nut) |
| { |
| AVFormatContext *s = nut->avf; |
| AVIOContext *bc = s->pb; |
| uint64_t tmp, chapter_start, chapter_len; |
| unsigned int stream_id_plus1, count; |
| int chapter_id, i, ret = 0; |
| int64_t value, end; |
| char name[256], str_value[1024], type_str[256]; |
| const char *type; |
| int *event_flags = NULL; |
| AVChapter *chapter = NULL; |
| AVStream *st = NULL; |
| AVDictionary **metadata = NULL; |
| int metadata_flag = 0; |
| |
| end = get_packetheader(nut, bc, 1, INFO_STARTCODE); |
| end += avio_tell(bc); |
| |
| GET_V(stream_id_plus1, tmp <= s->nb_streams); |
| chapter_id = get_s(bc); |
| chapter_start = ffio_read_varlen(bc); |
| chapter_len = ffio_read_varlen(bc); |
| count = ffio_read_varlen(bc); |
| |
| if (chapter_id && !stream_id_plus1) { |
| int64_t start = chapter_start / nut->time_base_count; |
| chapter = avpriv_new_chapter(s, chapter_id, |
| nut->time_base[chapter_start % |
| nut->time_base_count], |
| start, start + chapter_len, NULL); |
| if (!chapter) { |
| av_log(s, AV_LOG_ERROR, "Could not create chapter.\n"); |
| return AVERROR(ENOMEM); |
| } |
| metadata = &chapter->metadata; |
| } else if (stream_id_plus1) { |
| st = s->streams[stream_id_plus1 - 1]; |
| metadata = &st->metadata; |
| event_flags = &st->event_flags; |
| metadata_flag = AVSTREAM_EVENT_FLAG_METADATA_UPDATED; |
| } else { |
| metadata = &s->metadata; |
| event_flags = &s->event_flags; |
| metadata_flag = AVFMT_EVENT_FLAG_METADATA_UPDATED; |
| } |
| |
| for (i = 0; i < count; i++) { |
| ret = get_str(bc, name, sizeof(name)); |
| if (ret < 0) { |
| av_log(s, AV_LOG_ERROR, "get_str failed while decoding info header\n"); |
| return ret; |
| } |
| value = get_s(bc); |
| str_value[0] = 0; |
| |
| if (value == -1) { |
| type = "UTF-8"; |
| ret = get_str(bc, str_value, sizeof(str_value)); |
| } else if (value == -2) { |
| ret = get_str(bc, type_str, sizeof(type_str)); |
| if (ret < 0) { |
| av_log(s, AV_LOG_ERROR, "get_str failed while decoding info header\n"); |
| return ret; |
| } |
| type = type_str; |
| ret = get_str(bc, str_value, sizeof(str_value)); |
| } else if (value == -3) { |
| type = "s"; |
| value = get_s(bc); |
| } else if (value == -4) { |
| type = "t"; |
| value = ffio_read_varlen(bc); |
| } else if (value < -4) { |
| type = "r"; |
| get_s(bc); |
| } else { |
| type = "v"; |
| } |
| |
| if (ret < 0) { |
| av_log(s, AV_LOG_ERROR, "get_str failed while decoding info header\n"); |
| return ret; |
| } |
| |
| if (stream_id_plus1 > s->nb_streams) { |
| av_log(s, AV_LOG_WARNING, |
| "invalid stream id %d for info packet\n", |
| stream_id_plus1); |
| continue; |
| } |
| |
| if (!strcmp(type, "UTF-8")) { |
| if (chapter_id == 0 && !strcmp(name, "Disposition")) { |
| set_disposition_bits(s, str_value, stream_id_plus1 - 1); |
| continue; |
| } |
| |
| if (stream_id_plus1 && !strcmp(name, "r_frame_rate")) { |
| sscanf(str_value, "%d/%d", &st->r_frame_rate.num, &st->r_frame_rate.den); |
| if (st->r_frame_rate.num >= 1000LL*st->r_frame_rate.den || |
| st->r_frame_rate.num < 0 || st->r_frame_rate.den < 0) |
| st->r_frame_rate.num = st->r_frame_rate.den = 0; |
| continue; |
| } |
| |
| if (metadata && av_strcasecmp(name, "Uses") && |
| av_strcasecmp(name, "Depends") && av_strcasecmp(name, "Replaces")) { |
| if (event_flags) |
| *event_flags |= metadata_flag; |
| av_dict_set(metadata, name, str_value, 0); |
| } |
| } |
| } |
| |
| if (skip_reserved(bc, end) || ffio_get_checksum(bc)) { |
| av_log(s, AV_LOG_ERROR, "info header checksum mismatch\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| fail: |
| return FFMIN(ret, 0); |
| } |
| |
| static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr) |
| { |
| AVFormatContext *s = nut->avf; |
| AVIOContext *bc = s->pb; |
| int64_t end; |
| uint64_t tmp; |
| int ret; |
| |
| nut->last_syncpoint_pos = avio_tell(bc) - 8; |
| |
| end = get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE); |
| end += avio_tell(bc); |
| |
| tmp = ffio_read_varlen(bc); |
| *back_ptr = nut->last_syncpoint_pos - 16 * ffio_read_varlen(bc); |
| if (*back_ptr < 0) |
| return AVERROR_INVALIDDATA; |
| |
| ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count], |
| tmp / nut->time_base_count); |
| |
| if (nut->flags & NUT_BROADCAST) { |
| tmp = ffio_read_varlen(bc); |
| av_log(s, AV_LOG_VERBOSE, "Syncpoint wallclock %"PRId64"\n", |
| av_rescale_q(tmp / nut->time_base_count, |
| nut->time_base[tmp % nut->time_base_count], |
| AV_TIME_BASE_Q)); |
| } |
| |
| if (skip_reserved(bc, end) || ffio_get_checksum(bc)) { |
| av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| *ts = tmp / nut->time_base_count * |
| av_q2d(nut->time_base[tmp % nut->time_base_count]) * AV_TIME_BASE; |
| |
| if ((ret = ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts)) < 0) |
| return ret; |
| |
| return 0; |
| } |
| |
| //FIXME calculate exactly, this is just a good approximation. |
| static int64_t find_duration(NUTContext *nut, int64_t filesize) |
| { |
| AVFormatContext *s = nut->avf; |
| int64_t duration = 0; |
| |
| ff_find_last_ts(s, -1, &duration, NULL, nut_read_timestamp); |
| |
| if(duration > 0) |
| s->duration_estimation_method = AVFMT_DURATION_FROM_PTS; |
| return duration; |
| } |
| |
| static int find_and_decode_index(NUTContext *nut) |
| { |
| AVFormatContext *s = nut->avf; |
| AVIOContext *bc = s->pb; |
| uint64_t tmp, end; |
| int i, j, syncpoint_count; |
| int64_t filesize = avio_size(bc); |
| int64_t *syncpoints = NULL; |
| uint64_t max_pts; |
| int8_t *has_keyframe = NULL; |
| int ret = AVERROR_INVALIDDATA; |
| |
| if(filesize <= 0) |
| return -1; |
| |
| avio_seek(bc, filesize - 12, SEEK_SET); |
| avio_seek(bc, filesize - avio_rb64(bc), SEEK_SET); |
| if (avio_rb64(bc) != INDEX_STARTCODE) { |
| av_log(s, AV_LOG_WARNING, "no index at the end\n"); |
| |
| if(s->duration<=0) |
| s->duration = find_duration(nut, filesize); |
| return ret; |
| } |
| |
| end = get_packetheader(nut, bc, 1, INDEX_STARTCODE); |
| end += avio_tell(bc); |
| |
| max_pts = ffio_read_varlen(bc); |
| s->duration = av_rescale_q(max_pts / nut->time_base_count, |
| nut->time_base[max_pts % nut->time_base_count], |
| AV_TIME_BASE_Q); |
| s->duration_estimation_method = AVFMT_DURATION_FROM_PTS; |
| |
| GET_V(syncpoint_count, tmp < INT_MAX / 8 && tmp > 0); |
| syncpoints = av_malloc_array(syncpoint_count, sizeof(int64_t)); |
| has_keyframe = av_malloc_array(syncpoint_count + 1, sizeof(int8_t)); |
| if (!syncpoints || !has_keyframe) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| for (i = 0; i < syncpoint_count; i++) { |
| syncpoints[i] = ffio_read_varlen(bc); |
| if (syncpoints[i] <= 0) |
| goto fail; |
| if (i) |
| syncpoints[i] += syncpoints[i - 1]; |
| } |
| |
| for (i = 0; i < s->nb_streams; i++) { |
| int64_t last_pts = -1; |
| for (j = 0; j < syncpoint_count;) { |
| uint64_t x = ffio_read_varlen(bc); |
| int type = x & 1; |
| int n = j; |
| x >>= 1; |
| if (type) { |
| int flag = x & 1; |
| x >>= 1; |
| if (n + x >= syncpoint_count + 1) { |
| av_log(s, AV_LOG_ERROR, "index overflow A %d + %"PRIu64" >= %d\n", n, x, syncpoint_count + 1); |
| goto fail; |
| } |
| while (x--) |
| has_keyframe[n++] = flag; |
| has_keyframe[n++] = !flag; |
| } else { |
| if (x <= 1) { |
| av_log(s, AV_LOG_ERROR, "index: x %"PRIu64" is invalid\n", x); |
| goto fail; |
| } |
| while (x != 1) { |
| if (n >= syncpoint_count + 1) { |
| av_log(s, AV_LOG_ERROR, "index overflow B\n"); |
| goto fail; |
| } |
| has_keyframe[n++] = x & 1; |
| x >>= 1; |
| } |
| } |
| if (has_keyframe[0]) { |
| av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n"); |
| goto fail; |
| } |
| av_assert0(n <= syncpoint_count + 1); |
| for (; j < n && j < syncpoint_count; j++) { |
| if (has_keyframe[j]) { |
| uint64_t B, A = ffio_read_varlen(bc); |
| if (!A) { |
| A = ffio_read_varlen(bc); |
| B = ffio_read_varlen(bc); |
| // eor_pts[j][i] = last_pts + A + B |
| } else |
| B = 0; |
| av_add_index_entry(s->streams[i], 16 * syncpoints[j - 1], |
| last_pts + A, 0, 0, AVINDEX_KEYFRAME); |
| last_pts += A + B; |
| } |
| } |
| } |
| } |
| |
| if (skip_reserved(bc, end) || ffio_get_checksum(bc)) { |
| av_log(s, AV_LOG_ERROR, "index checksum mismatch\n"); |
| goto fail; |
| } |
| ret = 0; |
| |
| fail: |
| av_free(syncpoints); |
| av_free(has_keyframe); |
| return ret; |
| } |
| |
| static int nut_read_close(AVFormatContext *s) |
| { |
| NUTContext *nut = s->priv_data; |
| int i; |
| |
| av_freep(&nut->time_base); |
| av_freep(&nut->stream); |
| ff_nut_free_sp(nut); |
| for (i = 1; i < nut->header_count; i++) |
| av_freep(&nut->header[i]); |
| |
| return 0; |
| } |
| |
| static int nut_read_header(AVFormatContext *s) |
| { |
| NUTContext *nut = s->priv_data; |
| AVIOContext *bc = s->pb; |
| int64_t pos; |
| int initialized_stream_count; |
| |
| nut->avf = s; |
| |
| /* main header */ |
| pos = 0; |
| do { |
| pos = find_startcode(bc, MAIN_STARTCODE, pos) + 1; |
| if (pos < 0 + 1) { |
| av_log(s, AV_LOG_ERROR, "No main startcode found.\n"); |
| goto fail; |
| } |
| } while (decode_main_header(nut) < 0); |
| |
| /* stream headers */ |
| pos = 0; |
| for (initialized_stream_count = 0; initialized_stream_count < s->nb_streams;) { |
| pos = find_startcode(bc, STREAM_STARTCODE, pos) + 1; |
| if (pos < 0 + 1) { |
| av_log(s, AV_LOG_ERROR, "Not all stream headers found.\n"); |
| goto fail; |
| } |
| if (decode_stream_header(nut) >= 0) |
| initialized_stream_count++; |
| } |
| |
| /* info headers */ |
| pos = 0; |
| for (;;) { |
| uint64_t startcode = find_any_startcode(bc, pos); |
| pos = avio_tell(bc); |
| |
| if (startcode == 0) { |
| av_log(s, AV_LOG_ERROR, "EOF before video frames\n"); |
| goto fail; |
| } else if (startcode == SYNCPOINT_STARTCODE) { |
| nut->next_startcode = startcode; |
| break; |
| } else if (startcode != INFO_STARTCODE) { |
| continue; |
| } |
| |
| decode_info_header(nut); |
| } |
| |
| s->internal->data_offset = pos - 8; |
| |
| if (bc->seekable & AVIO_SEEKABLE_NORMAL) { |
| int64_t orig_pos = avio_tell(bc); |
| find_and_decode_index(nut); |
| avio_seek(bc, orig_pos, SEEK_SET); |
| } |
| av_assert0(nut->next_startcode == SYNCPOINT_STARTCODE); |
| |
| ff_metadata_conv_ctx(s, NULL, ff_nut_metadata_conv); |
| |
| return 0; |
| |
| fail: |
| nut_read_close(s); |
| |
| return AVERROR_INVALIDDATA; |
| } |
| |
| static int read_sm_data(AVFormatContext *s, AVIOContext *bc, AVPacket *pkt, int is_meta, int64_t maxpos) |
| { |
| int count = ffio_read_varlen(bc); |
| int skip_start = 0; |
| int skip_end = 0; |
| int channels = 0; |
| int64_t channel_layout = 0; |
| int sample_rate = 0; |
| int width = 0; |
| int height = 0; |
| int i, ret; |
| |
| for (i=0; i<count; i++) { |
| uint8_t name[256], str_value[256], type_str[256]; |
| int value; |
| if (avio_tell(bc) >= maxpos) |
| return AVERROR_INVALIDDATA; |
| ret = get_str(bc, name, sizeof(name)); |
| if (ret < 0) { |
| av_log(s, AV_LOG_ERROR, "get_str failed while reading sm data\n"); |
| return ret; |
| } |
| value = get_s(bc); |
| |
| if (value == -1) { |
| ret = get_str(bc, str_value, sizeof(str_value)); |
| if (ret < 0) { |
| av_log(s, AV_LOG_ERROR, "get_str failed while reading sm data\n"); |
| return ret; |
| } |
| av_log(s, AV_LOG_WARNING, "Unknown string %s / %s\n", name, str_value); |
| } else if (value == -2) { |
| uint8_t *dst = NULL; |
| int64_t v64, value_len; |
| |
| ret = get_str(bc, type_str, sizeof(type_str)); |
| if (ret < 0) { |
| av_log(s, AV_LOG_ERROR, "get_str failed while reading sm data\n"); |
| return ret; |
| } |
| value_len = ffio_read_varlen(bc); |
| if (value_len < 0 || value_len >= maxpos - avio_tell(bc)) |
| return AVERROR_INVALIDDATA; |
| if (!strcmp(name, "Palette")) { |
| dst = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, value_len); |
| } else if (!strcmp(name, "Extradata")) { |
| dst = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, value_len); |
| } else if (sscanf(name, "CodecSpecificSide%"SCNd64"", &v64) == 1) { |
| dst = av_packet_new_side_data(pkt, AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL, value_len + 8); |
| if(!dst) |
| return AVERROR(ENOMEM); |
| AV_WB64(dst, v64); |
| dst += 8; |
| } else if (!strcmp(name, "ChannelLayout") && value_len == 8) { |
| channel_layout = avio_rl64(bc); |
| continue; |
| } else { |
| av_log(s, AV_LOG_WARNING, "Unknown data %s / %s\n", name, type_str); |
| avio_skip(bc, value_len); |
| continue; |
| } |
| if(!dst) |
| return AVERROR(ENOMEM); |
| avio_read(bc, dst, value_len); |
| } else if (value == -3) { |
| value = get_s(bc); |
| } else if (value == -4) { |
| value = ffio_read_varlen(bc); |
| } else if (value < -4) { |
| get_s(bc); |
| } else { |
| if (!strcmp(name, "SkipStart")) { |
| skip_start = value; |
| } else if (!strcmp(name, "SkipEnd")) { |
| skip_end = value; |
| } else if (!strcmp(name, "Channels")) { |
| channels = value; |
| } else if (!strcmp(name, "SampleRate")) { |
| sample_rate = value; |
| } else if (!strcmp(name, "Width")) { |
| width = value; |
| } else if (!strcmp(name, "Height")) { |
| height = value; |
| } else { |
| av_log(s, AV_LOG_WARNING, "Unknown integer %s\n", name); |
| } |
| } |
| } |
| |
| if (channels || channel_layout || sample_rate || width || height) { |
| uint8_t *dst = av_packet_new_side_data(pkt, AV_PKT_DATA_PARAM_CHANGE, 28); |
| if (!dst) |
| return AVERROR(ENOMEM); |
| bytestream_put_le32(&dst, |
| AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT*(!!channels) + |
| AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT*(!!channel_layout) + |
| AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE*(!!sample_rate) + |
| AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS*(!!(width|height)) |
| ); |
| if (channels) |
| bytestream_put_le32(&dst, channels); |
| if (channel_layout) |
| bytestream_put_le64(&dst, channel_layout); |
| if (sample_rate) |
| bytestream_put_le32(&dst, sample_rate); |
| if (width || height){ |
| bytestream_put_le32(&dst, width); |
| bytestream_put_le32(&dst, height); |
| } |
| } |
| |
| if (skip_start || skip_end) { |
| uint8_t *dst = av_packet_new_side_data(pkt, AV_PKT_DATA_SKIP_SAMPLES, 10); |
| if (!dst) |
| return AVERROR(ENOMEM); |
| AV_WL32(dst, skip_start); |
| AV_WL32(dst+4, skip_end); |
| } |
| |
| if (avio_tell(bc) >= maxpos) |
| return AVERROR_INVALIDDATA; |
| |
| return 0; |
| } |
| |
| static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id, |
| uint8_t *header_idx, int frame_code) |
| { |
| AVFormatContext *s = nut->avf; |
| AVIOContext *bc = s->pb; |
| StreamContext *stc; |
| int size, flags, size_mul, pts_delta, i, reserved_count, ret; |
| uint64_t tmp; |
| |
| if (!(nut->flags & NUT_PIPE) && |
| avio_tell(bc) > nut->last_syncpoint_pos + nut->max_distance) { |
| av_log(s, AV_LOG_ERROR, |
| "Last frame must have been damaged %"PRId64" > %"PRId64" + %d\n", |
| avio_tell(bc), nut->last_syncpoint_pos, nut->max_distance); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| flags = nut->frame_code[frame_code].flags; |
| size_mul = nut->frame_code[frame_code].size_mul; |
| size = nut->frame_code[frame_code].size_lsb; |
| *stream_id = nut->frame_code[frame_code].stream_id; |
| pts_delta = nut->frame_code[frame_code].pts_delta; |
| reserved_count = nut->frame_code[frame_code].reserved_count; |
| *header_idx = nut->frame_code[frame_code].header_idx; |
| |
| if (flags & FLAG_INVALID) |
| return AVERROR_INVALIDDATA; |
| if (flags & FLAG_CODED) |
| flags ^= ffio_read_varlen(bc); |
| if (flags & FLAG_STREAM_ID) { |
| GET_V(*stream_id, tmp < s->nb_streams); |
| } |
| stc = &nut->stream[*stream_id]; |
| if (flags & FLAG_CODED_PTS) { |
| int64_t coded_pts = ffio_read_varlen(bc); |
| // FIXME check last_pts validity? |
| if (coded_pts < (1LL << stc->msb_pts_shift)) { |
| *pts = ff_lsb2full(stc, coded_pts); |
| } else |
| *pts = coded_pts - (1LL << stc->msb_pts_shift); |
| } else |
| *pts = stc->last_pts + pts_delta; |
| if (flags & FLAG_SIZE_MSB) |
| size += size_mul * ffio_read_varlen(bc); |
| if (flags & FLAG_MATCH_TIME) |
| get_s(bc); |
| if (flags & FLAG_HEADER_IDX) |
| *header_idx = ffio_read_varlen(bc); |
| if (flags & FLAG_RESERVED) |
| reserved_count = ffio_read_varlen(bc); |
| for (i = 0; i < reserved_count; i++) { |
| if (bc->eof_reached) { |
| av_log(s, AV_LOG_ERROR, "reached EOF while decoding frame header\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| ffio_read_varlen(bc); |
| } |
| |
| if (*header_idx >= (unsigned)nut->header_count) { |
| av_log(s, AV_LOG_ERROR, "header_idx invalid\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| if (size > 4096) |
| *header_idx = 0; |
| size -= nut->header_len[*header_idx]; |
| |
| if (flags & FLAG_CHECKSUM) { |
| avio_rb32(bc); // FIXME check this |
| } else if (!(nut->flags & NUT_PIPE) && |
| size > 2 * nut->max_distance || |
| FFABS(stc->last_pts - *pts) > stc->max_pts_distance) { |
| av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| stc->last_pts = *pts; |
| stc->last_flags = flags; |
| |
| return size; |
| fail: |
| return ret; |
| } |
| |
| static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code) |
| { |
| AVFormatContext *s = nut->avf; |
| AVIOContext *bc = s->pb; |
| int size, stream_id, discard, ret; |
| int64_t pts, last_IP_pts; |
| StreamContext *stc; |
| uint8_t header_idx; |
| |
| size = decode_frame_header(nut, &pts, &stream_id, &header_idx, frame_code); |
| if (size < 0) |
| return size; |
| |
| stc = &nut->stream[stream_id]; |
| |
| if (stc->last_flags & FLAG_KEY) |
| stc->skip_until_key_frame = 0; |
| |
| discard = s->streams[stream_id]->discard; |
| last_IP_pts = s->streams[stream_id]->last_IP_pts; |
| if ((discard >= AVDISCARD_NONKEY && !(stc->last_flags & FLAG_KEY)) || |
| (discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE && |
| last_IP_pts > pts) || |
| discard >= AVDISCARD_ALL || |
| stc->skip_until_key_frame) { |
| avio_skip(bc, size); |
| return 1; |
| } |
| |
| ret = av_new_packet(pkt, size + nut->header_len[header_idx]); |
| if (ret < 0) |
| return ret; |
| if (nut->header[header_idx]) |
| memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]); |
| pkt->pos = avio_tell(bc); // FIXME |
| if (stc->last_flags & FLAG_SM_DATA) { |
| int sm_size; |
| if (read_sm_data(s, bc, pkt, 0, pkt->pos + size) < 0) { |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| if (read_sm_data(s, bc, pkt, 1, pkt->pos + size) < 0) { |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| sm_size = avio_tell(bc) - pkt->pos; |
| size -= sm_size; |
| pkt->size -= sm_size; |
| } |
| |
| ret = avio_read(bc, pkt->data + nut->header_len[header_idx], size); |
| if (ret != size) { |
| if (ret < 0) |
| goto fail; |
| } |
| av_shrink_packet(pkt, nut->header_len[header_idx] + ret); |
| |
| pkt->stream_index = stream_id; |
| if (stc->last_flags & FLAG_KEY) |
| pkt->flags |= AV_PKT_FLAG_KEY; |
| pkt->pts = pts; |
| |
| return 0; |
| fail: |
| av_packet_unref(pkt); |
| return ret; |
| } |
| |
| static int nut_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| NUTContext *nut = s->priv_data; |
| AVIOContext *bc = s->pb; |
| int i, frame_code = 0, ret, skip; |
| int64_t ts, back_ptr; |
| |
| for (;;) { |
| int64_t pos = avio_tell(bc); |
| uint64_t tmp = nut->next_startcode; |
| nut->next_startcode = 0; |
| |
| if (tmp) { |
| pos -= 8; |
| } else { |
| frame_code = avio_r8(bc); |
| if (avio_feof(bc)) |
| return AVERROR_EOF; |
| if (frame_code == 'N') { |
| tmp = frame_code; |
| for (i = 1; i < 8; i++) |
| tmp = (tmp << 8) + avio_r8(bc); |
| } |
| } |
| switch (tmp) { |
| case MAIN_STARTCODE: |
| case STREAM_STARTCODE: |
| case INDEX_STARTCODE: |
| skip = get_packetheader(nut, bc, 0, tmp); |
| avio_skip(bc, skip); |
| break; |
| case INFO_STARTCODE: |
| if (decode_info_header(nut) < 0) |
| goto resync; |
| break; |
| case SYNCPOINT_STARTCODE: |
| if (decode_syncpoint(nut, &ts, &back_ptr) < 0) |
| goto resync; |
| frame_code = avio_r8(bc); |
| case 0: |
| ret = decode_frame(nut, pkt, frame_code); |
| if (ret == 0) |
| return 0; |
| else if (ret == 1) // OK but discard packet |
| break; |
| default: |
| resync: |
| av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos); |
| tmp = find_any_startcode(bc, FFMAX(nut->last_syncpoint_pos, nut->last_resync_pos) + 1); |
| nut->last_resync_pos = avio_tell(bc); |
| if (tmp == 0) |
| return AVERROR_INVALIDDATA; |
| av_log(s, AV_LOG_DEBUG, "sync\n"); |
| nut->next_startcode = tmp; |
| } |
| } |
| } |
| |
| static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, |
| int64_t *pos_arg, int64_t pos_limit) |
| { |
| NUTContext *nut = s->priv_data; |
| AVIOContext *bc = s->pb; |
| int64_t pos, pts, back_ptr; |
| av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n", |
| stream_index, *pos_arg, pos_limit); |
| |
| pos = *pos_arg; |
| do { |
| pos = find_startcode(bc, SYNCPOINT_STARTCODE, pos) + 1; |
| if (pos < 1) { |
| av_log(s, AV_LOG_ERROR, "read_timestamp failed.\n"); |
| return AV_NOPTS_VALUE; |
| } |
| } while (decode_syncpoint(nut, &pts, &back_ptr) < 0); |
| *pos_arg = pos - 1; |
| av_assert0(nut->last_syncpoint_pos == *pos_arg); |
| |
| av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts, back_ptr); |
| if (stream_index == -2) |
| return back_ptr; |
| av_assert0(stream_index == -1); |
| return pts; |
| } |
| |
| static int read_seek(AVFormatContext *s, int stream_index, |
| int64_t pts, int flags) |
| { |
| NUTContext *nut = s->priv_data; |
| AVStream *st = s->streams[stream_index]; |
| Syncpoint dummy = { .ts = pts * av_q2d(st->time_base) * AV_TIME_BASE }; |
| Syncpoint nopts_sp = { .ts = AV_NOPTS_VALUE, .back_ptr = AV_NOPTS_VALUE }; |
| Syncpoint *sp, *next_node[2] = { &nopts_sp, &nopts_sp }; |
| int64_t pos, pos2, ts; |
| int i; |
| |
| if (nut->flags & NUT_PIPE) { |
| return AVERROR(ENOSYS); |
| } |
| |
| if (st->internal->index_entries) { |
| int index = av_index_search_timestamp(st, pts, flags); |
| if (index < 0) |
| index = av_index_search_timestamp(st, pts, flags ^ AVSEEK_FLAG_BACKWARD); |
| if (index < 0) |
| return -1; |
| |
| pos2 = st->internal->index_entries[index].pos; |
| ts = st->internal->index_entries[index].timestamp; |
| } else { |
| av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pts_cmp, |
| (void **) next_node); |
| av_log(s, AV_LOG_DEBUG, "%"PRIu64"-%"PRIu64" %"PRId64"-%"PRId64"\n", |
| next_node[0]->pos, next_node[1]->pos, next_node[0]->ts, |
| next_node[1]->ts); |
| pos = ff_gen_search(s, -1, dummy.ts, next_node[0]->pos, |
| next_node[1]->pos, next_node[1]->pos, |
| next_node[0]->ts, next_node[1]->ts, |
| AVSEEK_FLAG_BACKWARD, &ts, nut_read_timestamp); |
| if (pos < 0) |
| return pos; |
| |
| if (!(flags & AVSEEK_FLAG_BACKWARD)) { |
| dummy.pos = pos + 16; |
| next_node[1] = &nopts_sp; |
| av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pos_cmp, |
| (void **) next_node); |
| pos2 = ff_gen_search(s, -2, dummy.pos, next_node[0]->pos, |
| next_node[1]->pos, next_node[1]->pos, |
| next_node[0]->back_ptr, next_node[1]->back_ptr, |
| flags, &ts, nut_read_timestamp); |
| if (pos2 >= 0) |
| pos = pos2; |
| // FIXME dir but I think it does not matter |
| } |
| dummy.pos = pos; |
| sp = av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pos_cmp, |
| NULL); |
| |
| av_assert0(sp); |
| pos2 = sp->back_ptr - 15; |
| } |
| av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2); |
| pos = find_startcode(s->pb, SYNCPOINT_STARTCODE, pos2); |
| avio_seek(s->pb, pos, SEEK_SET); |
| nut->last_syncpoint_pos = pos; |
| av_log(s, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos); |
| if (pos2 > pos || pos2 + 15 < pos) |
| av_log(s, AV_LOG_ERROR, "no syncpoint at backptr pos\n"); |
| for (i = 0; i < s->nb_streams; i++) |
| nut->stream[i].skip_until_key_frame = 1; |
| |
| nut->last_resync_pos = 0; |
| |
| return 0; |
| } |
| |
| AVInputFormat ff_nut_demuxer = { |
| .name = "nut", |
| .long_name = NULL_IF_CONFIG_SMALL("NUT"), |
| .flags = AVFMT_SEEK_TO_PTS, |
| .priv_data_size = sizeof(NUTContext), |
| .read_probe = nut_probe, |
| .read_header = nut_read_header, |
| .read_packet = nut_read_packet, |
| .read_close = nut_read_close, |
| .read_seek = read_seek, |
| .extensions = "nut", |
| .codec_tag = ff_nut_codec_tags, |
| }; |
