diff options
Diffstat (limited to 'ffmpeg/libavformat/nutdec.c')
| -rw-r--r-- | ffmpeg/libavformat/nutdec.c | 1050 |
1 files changed, 1050 insertions, 0 deletions
diff --git a/ffmpeg/libavformat/nutdec.c b/ffmpeg/libavformat/nutdec.c new file mode 100644 index 0000000..8896518 --- /dev/null +++ b/ffmpeg/libavformat/nutdec.c @@ -0,0 +1,1050 @@ +/* + * "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/mathematics.h" +#include "libavutil/tree.h" +#include "avio_internal.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 (maxlen) + string[FFMIN(len, maxlen - 1)] = 0; + + 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; + } +} + +#ifdef TRACE +static inline uint64_t get_v_trace(AVIOContext *bc, const char *file, + const char *func, int line) +{ + uint64_t v = ffio_read_varlen(bc); + + av_log(NULL, AV_LOG_DEBUG, "get_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", + v, v, file, func, line); + return v; +} + +static inline int64_t get_s_trace(AVIOContext *bc, const char *file, + const char *func, int line) +{ + int64_t v = get_s(bc); + + av_log(NULL, AV_LOG_DEBUG, "get_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", + v, v, file, func, line); + return v; +} + +static inline uint64_t get_4cc_trace(AVIOContext *bc, char *file, + char *func, int line) +{ + uint64_t v = get_fourcc(bc); + + av_log(NULL, AV_LOG_DEBUG, "get_fourcc %5"PRId64" / %"PRIX64" in %s %s:%d\n", + v, v, file, func, line); + return v; +} +#define ffio_read_varlen(bc) get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__) +#define get_s(bc) get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__) +#define get_fourcc(bc) get_4cc_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__) +#endif + +static int get_packetheader(NUTContext *nut, AVIOContext *bc, + int calculate_checksum, uint64_t startcode) +{ + int64_t size; +// start = avio_tell(bc) - 8; + + 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 (!url_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(AVProbeData *p) +{ + int i; + uint64_t code = 0; + + for (i = 0; i < p->buf_size; i++) { + code = (code << 8) | p->buf[i]; + if (code == MAIN_STARTCODE) + 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); \ + return -1; \ + } \ + 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 -1; + } else { + while (pos--) + 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; + 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); + + GET_V(tmp, tmp >= 2 && tmp <= 3); + 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(nut->time_base_count * sizeof(AVRational)); + + 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, "time base invalid\n"); + return AVERROR_INVALIDDATA; + } + } + 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) + ffio_read_varlen(bc); + + if (count == 0 || i + count > 256) { + av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i); + return AVERROR_INVALIDDATA; + } + if (tmp_stream >= stream_count) { + av_log(s, AV_LOG_ERROR, "illegal stream number\n"); + return AVERROR_INVALIDDATA; + } + + 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); + rem -= nut->header_len[i]; + if (rem < 0) { + av_log(s, AV_LOG_ERROR, "invalid elision header\n"); + return AVERROR_INVALIDDATA; + } + hdr = av_malloc(nut->header_len[i]); + if (!hdr) + return AVERROR(ENOMEM); + avio_read(bc, hdr, nut->header_len[i]); + nut->header[i] = hdr; + } + av_assert0(nut->header_len[0] == 0); + } + + if (skip_reserved(bc, end) || ffio_get_checksum(bc)) { + av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n"); + return AVERROR_INVALIDDATA; + } + + nut->stream = av_mallocz(sizeof(StreamContext) * stream_count); + for (i = 0; i < stream_count; i++) + avformat_new_stream(s, NULL); + + return 0; +} + +static int decode_stream_header(NUTContext *nut) +{ + AVFormatContext *s = nut->avf; + AVIOContext *bc = s->pb; + StreamContext *stc; + int class, stream_id; + uint64_t tmp, end; + AVStream *st; + + 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->codec->codec_tag = tmp; + switch (class) { + case 0: + st->codec->codec_type = AVMEDIA_TYPE_VIDEO; + st->codec->codec_id = av_codec_get_id((const AVCodecTag * const []) { + ff_nut_video_tags, + ff_codec_bmp_tags, + 0 + }, + tmp); + break; + case 1: + st->codec->codec_type = AVMEDIA_TYPE_AUDIO; + st->codec->codec_id = av_codec_get_id((const AVCodecTag * const []) { + ff_nut_audio_tags, + ff_codec_wav_tags, + 0 + }, + tmp); + break; + case 2: + st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; + st->codec->codec_id = ff_codec_get_id(ff_nut_subtitle_tags, tmp); + break; + case 3: + st->codec->codec_type = AVMEDIA_TYPE_DATA; + st->codec->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 -1; + } + if (class < 3 && st->codec->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->codec->has_b_frames = stc->decode_delay; + ffio_read_varlen(bc); // stream flags + + GET_V(st->codec->extradata_size, tmp < (1 << 30)); + if (st->codec->extradata_size) { + st->codec->extradata = av_mallocz(st->codec->extradata_size + + FF_INPUT_BUFFER_PADDING_SIZE); + avio_read(bc, st->codec->extradata, st->codec->extradata_size); + } + + if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) { + GET_V(st->codec->width, tmp > 0); + GET_V(st->codec->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); + return -1; + } + ffio_read_varlen(bc); /* csp type */ + } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) { + GET_V(st->codec->sample_rate, tmp > 0); + ffio_read_varlen(bc); // samplerate_den + GET_V(st->codec->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); + return -1; + } + 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; +} + +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; + int64_t value, end; + char name[256], str_value[1024], type_str[256]; + const char *type; + AVChapter *chapter = NULL; + AVStream *st = NULL; + AVDictionary **metadata = NULL; + + 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); + metadata = &chapter->metadata; + } else if (stream_id_plus1) { + st = s->streams[stream_id_plus1 - 1]; + metadata = &st->metadata; + } else + metadata = &s->metadata; + + for (i = 0; i < count; i++) { + get_str(bc, name, sizeof(name)); + value = get_s(bc); + if (value == -1) { + type = "UTF-8"; + get_str(bc, str_value, sizeof(str_value)); + } else if (value == -2) { + get_str(bc, type_str, sizeof(type_str)); + type = type_str; + 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 (stream_id_plus1 > s->nb_streams) { + av_log(s, AV_LOG_ERROR, "invalid stream id for info packet\n"); + 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 = st->r_frame_rate.den = 0; + continue; + } + + if (metadata && av_strcasecmp(name, "Uses") && + av_strcasecmp(name, "Depends") && av_strcasecmp(name, "Replaces")) + 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 -1; + } + return 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; + + 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 (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; + ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts); + + 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; + + int64_t pos = FFMAX(0, filesize - 2*nut->max_distance); + for(;;){ + int64_t ts = nut_read_timestamp(s, -1, &pos, INT64_MAX); + if(ts < 0) + break; + duration = FFMAX(duration, ts); + pos++; + } + 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; + int8_t *has_keyframe; + int ret = -1; + + 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_ERROR, "no index at the end\n"); + + if(s->duration<=0) + s->duration = find_duration(nut, filesize); + return -1; + } + + end = get_packetheader(nut, bc, 1, INDEX_STARTCODE); + end += avio_tell(bc); + + ffio_read_varlen(bc); // max_pts + GET_V(syncpoint_count, tmp < INT_MAX / 8 && tmp > 0); + syncpoints = av_malloc(sizeof(int64_t) * syncpoint_count); + has_keyframe = av_malloc(sizeof(int8_t) * (syncpoint_count + 1)); + 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 { + 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_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"); + return AVERROR_INVALIDDATA; + } + } 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"); + return AVERROR_INVALIDDATA; + } + 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"); + return AVERROR_INVALIDDATA; + } else if (startcode == SYNCPOINT_STARTCODE) { + nut->next_startcode = startcode; + break; + } else if (startcode != INFO_STARTCODE) { + continue; + } + + decode_info_header(nut); + } + + s->data_offset = pos - 8; + + if (bc->seekable) { + 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; +} + +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; + uint64_t tmp; + + if (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) { + int coded_pts = ffio_read_varlen(bc); + // FIXME check last_pts validity? + if (coded_pts < (1 << 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++) + 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 (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; +} + +static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code) +{ + AVFormatContext *s = nut->avf; + AVIOContext *bc = s->pb; + int size, stream_id, discard; + 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; + } + + if (av_new_packet(pkt, size + nut->header_len[header_idx]) < 0) + return AVERROR(ENOMEM); + memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]); + pkt->pos = avio_tell(bc); // FIXME + avio_read(bc, pkt->data + nut->header_len[header_idx], size); + + pkt->stream_index = stream_id; + if (stc->last_flags & FLAG_KEY) + pkt->flags |= AV_PKT_FLAG_KEY; + pkt->pts = pts; + + return 0; +} + +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 (url_feof(bc)) + return -1; + 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, nut->last_syncpoint_pos + 1); + 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 (st->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->index_entries[index].pos; + ts = st->index_entries[index].timestamp; + } else { + av_tree_find(nut->syncpoints, &dummy, (void *) 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 (!(flags & AVSEEK_FLAG_BACKWARD)) { + dummy.pos = pos + 16; + next_node[1] = &nopts_sp; + av_tree_find(nut->syncpoints, &dummy, (void *) 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, (void *) ff_nut_sp_pos_cmp, + NULL); + + av_assert0(sp); + pos2 = sp->back_ptr - 15; + } + av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2); + pos = find_startcode(s->pb, SYNCPOINT_STARTCODE, pos2); + avio_seek(s->pb, pos, SEEK_SET); + av_log(NULL, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos); + if (pos2 > pos || pos2 + 15 < pos) + av_log(NULL, 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; + + return 0; +} + +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; +} + +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, +}; |