diff options
Diffstat (limited to 'ffmpeg1/libavformat/nutdec.c')
| -rw-r--r-- | ffmpeg1/libavformat/nutdec.c | 1050 |
1 files changed, 0 insertions, 1050 deletions
diff --git a/ffmpeg1/libavformat/nutdec.c b/ffmpeg1/libavformat/nutdec.c deleted file mode 100644 index 8896518..0000000 --- a/ffmpeg1/libavformat/nutdec.c +++ /dev/null @@ -1,1050 +0,0 @@ -/* - * "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, -}; 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