lavf: add missing new line to some error messages
[ffmpeg.git] / libavformat / nutdec.c
index 93888a2..397e44f 100644 (file)
@@ -3,25 +3,25 @@
  * Copyright (c) 2004-2006 Michael Niedermayer
  * Copyright (c) 2003 Alex Beregszaszi
  *
- * This file is part of Libav.
+ * This file is part of FFmpeg.
  *
- * Libav is free software; you can redistribute it and/or
+ * 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.
  *
- * Libav is distributed in the hope that it will be useful,
+ * 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 Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#include <strings.h>
 #include "libavutil/avstring.h"
+#include "libavutil/avassert.h"
 #include "libavutil/bswap.h"
 #include "libavutil/dict.h"
 #include "libavutil/mathematics.h"
 #include "avio_internal.h"
 #include "nut.h"
 
-#undef NDEBUG
-#include <assert.h>
-
 #define NUT_MAX_STREAMS 256    /* arbitrary sanity check value */
 
-static int get_str(AVIOContext *bc, char *string, unsigned int maxlen){
-    unsigned int len= ffio_read_varlen(bc);
+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)
+    if (len && maxlen)
         avio_read(bc, string, FFMIN(len, maxlen));
-    while(len > maxlen){
+    while (len > maxlen) {
         avio_r8(bc);
         len--;
     }
 
-    if(maxlen)
-        string[FFMIN(len, maxlen-1)]= 0;
+    if (maxlen)
+        string[FFMIN(len, maxlen - 1)] = 0;
 
-    if(maxlen == len)
+    if (maxlen == len)
         return -1;
     else
         return 0;
 }
 
-static int64_t get_s(AVIOContext *bc){
+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);
+    if (v & 1)
+        return -(v >> 1);
+    else
+        return  (v >> 1);
 }
 
-static uint64_t get_fourcc(AVIOContext *bc){
-    unsigned int len= ffio_read_varlen(bc);
+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            return -1;
+    if (len == 2)
+        return avio_rl16(bc);
+    else if (len == 4)
+        return avio_rl32(bc);
+    else
+        return -1;
 }
 
 #ifdef TRACE
-static inline uint64_t get_v_trace(AVIOContext *bc, char *file, char *func, int line){
-    uint64_t v= ffio_read_varlen(bc);
+static inline uint64_t get_v_trace(AVIOContext *bc, char *file,
+                                   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);
+    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, char *file, char *func, int line){
-    int64_t v= get_s(bc);
+static inline int64_t get_s_trace(AVIOContext *bc, char *file,
+                                  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);
+    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_vb_trace(AVIOContext *bc, char *file, char *func, int line){
-    uint64_t v= get_vb(bc);
+static inline uint64_t get_vb_trace(AVIOContext *bc, char *file,
+                                    char *func, int line)
+{
+    uint64_t v = get_vb(bc);
 
-    av_log(NULL, AV_LOG_DEBUG, "get_vb %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
+    av_log(NULL, AV_LOG_DEBUG, "get_vb %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_vb(bc)  get_vb_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
+#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_vb(bc)           get_vb_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
 #endif
 
-static int get_packetheader(NUTContext *nut, AVIOContext *bc, int calculate_checksum, uint64_t startcode)
+static int get_packetheader(NUTContext *nut, AVIOContext *bc,
+                            int calculate_checksum, uint64_t startcode)
 {
     int64_t size;
-//    start= avio_tell(bc) - 8;
+//    start = avio_tell(bc) - 8;
 
-    startcode= av_be2ne64(startcode);
-    startcode= ff_crc04C11DB7_update(0, (uint8_t*)&startcode, 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)
+    size = ffio_read_varlen(bc);
+    if (size > 4096)
         avio_rb32(bc);
-    if(ffio_get_checksum(bc) && size > 4096)
+    if (ffio_get_checksum(bc) && size > 4096)
         return -1;
 
     ffio_init_checksum(bc, calculate_checksum ? ff_crc04C11DB7_update : NULL, 0);
@@ -114,17 +132,19 @@ static int get_packetheader(NUTContext *nut, AVIOContext *bc, int calculate_chec
     return size;
 }
 
-static uint64_t find_any_startcode(AVIOContext *bc, int64_t pos){
-    uint64_t state=0;
-
-    if(pos >= 0)
-        avio_seek(bc, pos, SEEK_SET); //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
-
-    while(!bc->eof_reached){
-        state= (state<<8) | avio_r8(bc);
-        if((state>>56) != 'N')
+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){
+        switch (state) {
         case MAIN_STARTCODE:
         case STREAM_STARTCODE:
         case SYNCPOINT_STARTCODE:
@@ -143,20 +163,22 @@ static uint64_t find_any_startcode(AVIOContext *bc, int64_t pos){
  * @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)
+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)
+        else if (startcode == 0)
             return -1;
-        pos=-1;
+        pos = -1;
     }
 }
 
-static int nut_probe(AVProbeData *p){
+static int nut_probe(AVProbeData *p)
+{
     int i;
-    uint64_t code= 0;
+    uint64_t code = 0;
 
     for (i = 0; i < p->buf_size; i++) {
         code = (code << 8) | p->buf[i];
@@ -166,225 +188,252 @@ static int nut_probe(AVProbeData *p){
     return 0;
 }
 
-#define GET_V(dst, check) \
-    tmp= ffio_read_varlen(bc);\
-    if(!(check)){\
-        av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp);\
-        return -1;\
-    }\
-    dst= tmp;
+#define GET_V(dst, check)                                                 \
+    tmp = ffio_read_varlen(bc);                                           \
+    if (!(check)) {                                                       \
+        av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp);  \
+        return -1;                                                        \
+    }                                                                     \
+    dst = tmp;
 
-static int skip_reserved(AVIOContext *bc, int64_t pos){
+static int skip_reserved(AVIOContext *bc, int64_t pos)
+{
     pos -= avio_tell(bc);
-    if(pos<0){
+    if (pos < 0) {
         avio_seek(bc, pos, SEEK_CUR);
         return -1;
-    }else{
-        while(pos--)
+    } else {
+        while (pos--)
             avio_r8(bc);
         return 0;
     }
 }
 
-static int decode_main_header(NUTContext *nut){
-    AVFormatContext *s= nut->avf;
-    AVIOContext *bc = s->pb;
+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, tmp_stream, tmp_mul, tmp_pts, tmp_size, count, tmp_res, tmp_head_idx;
+    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  = 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)
+    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){
+    if (nut->max_distance > 65536) {
         av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance);
-        nut->max_distance= 65536;
+        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));
+    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){
+    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){
+    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){
+        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++){
+        for (j = 0; j < count; j++, i++) {
             if (i == 'N') {
-                nut->frame_code[i].flags= FLAG_INVALID;
+                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;
+            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;
         }
     }
-    assert(nut->frame_code['N'].flags == FLAG_INVALID);
+    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)
+    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++){
-            GET_V(nut->header_len[i], tmp>0 && tmp<256);
+        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){
+            if (rem < 0) {
                 av_log(s, AV_LOG_ERROR, "invalid elision header\n");
                 return AVERROR_INVALIDDATA;
             }
-            nut->header[i]= av_malloc(nut->header_len[i]);
-            avio_read(bc, nut->header[i], nut->header_len[i]);
+            hdr = av_malloc(nut->header_len[i]);
+            if (!hdr)
+                return AVERROR(ENOMEM);
+            avio_read(bc, hdr, nut->header_len[i]);
+            nut->header[i] = hdr;
         }
-        assert(nut->header_len[0]==0);
+        av_assert0(nut->header_len[0] == 0);
     }
 
-    if(skip_reserved(bc, end) || ffio_get_checksum(bc)){
+    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++){
-        av_new_stream(s, i);
-    }
+    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;
+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  = 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];
+    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_codec_bmp_tags, ff_nut_video_tags, 0 },
-                tmp);
-            break;
-        case 1:
-            st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
-            st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags, 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;
-            break;
-        default:
-            av_log(s, AV_LOG_ERROR, "unknown stream class (%d)\n", class);
-            return -1;
+    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_codec_bmp_tags,
+                                                    ff_nut_video_tags,
+                                                    0
+                                                },
+                                                tmp);
+        break;
+    case 1:
+        st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+        st->codec->codec_id   = ff_codec_get_id(ff_codec_wav_tags, 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;
+        break;
+    default:
+        av_log(s, AV_LOG_ERROR, "unknown stream class (%d)\n", class);
+        return -1;
     }
-    if(class<3 && st->codec->codec_id == 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);
+    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)
+    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);
+        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)
+    } 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);
+    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];
-    av_set_pts_info(s->streams[stream_id], 63, stc->time_base->num, stc->time_base->den);
+    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){
+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) {
+
+    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)
@@ -392,61 +441,63 @@ static void set_disposition_bits(AVFormatContext* avf, char* value, int stream_i
             avf->streams[i]->disposition |= flag;
 }
 
-static int decode_info_header(NUTContext *nut){
-    AVFormatContext *s= nut->avf;
-    AVIOContext *bc = s->pb;
+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;
+    AVChapter *chapter      = NULL;
+    AVStream *st            = NULL;
     AVDictionary **metadata = NULL;
 
-    end= get_packetheader(nut, bc, 1, INFO_STARTCODE);
+    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= ff_new_chapter(s, chapter_id,
-                                nut->time_base[chapter_start % nut->time_base_count],
-                                start, start + chapter_len, NULL);
+    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];
+    } 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++){
+    for (i = 0; i < count; i++) {
         get_str(bc, name, sizeof(name));
-        value= get_s(bc);
-        if(value == -1){
-            type= "UTF-8";
+        value = get_s(bc);
+        if (value == -1) {
+            type = "UTF-8";
             get_str(bc, str_value, sizeof(str_value));
-        }else if(value == -2){
+        } else if (value == -2) {
             get_str(bc, type_str, sizeof(type_str));
-            type= 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";
+        } 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";
+        } else {
+            type = "v";
         }
 
         if (stream_id_plus1 > s->nb_streams) {
@@ -454,222 +505,251 @@ static int decode_info_header(NUTContext *nut){
             continue;
         }
 
-        if(!strcmp(type, "UTF-8")){
-            if(chapter_id==0 && !strcmp(name, "Disposition")) {
+        if (!strcmp(type, "UTF-8")) {
+            if (chapter_id == 0 && !strcmp(name, "Disposition")) {
                 set_disposition_bits(s, str_value, stream_id_plus1 - 1);
                 continue;
             }
-            if(metadata && strcasecmp(name,"Uses")
-               && strcasecmp(name,"Depends") && strcasecmp(name,"Replaces"))
+            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)){
+    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;
+static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr)
+{
+    AVFormatContext *s = nut->avf;
+    AVIOContext *bc    = s->pb;
     int64_t end, tmp;
 
-    nut->last_syncpoint_pos= avio_tell(bc)-8;
+    nut->last_syncpoint_pos = avio_tell(bc) - 8;
 
-    end= get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE);
+    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)
+    tmp       = ffio_read_varlen(bc);
+    *back_ptr = nut->last_syncpoint_pos - 16 * ffio_read_varlen(bc);
+    if (*back_ptr < 0)
         return -1;
 
-    ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count], tmp / nut->time_base_count);
+    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)){
+    if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
         av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n");
         return -1;
     }
 
-    *ts= tmp / s->nb_streams * av_q2d(nut->time_base[tmp % s->nb_streams])*AV_TIME_BASE;
+    *ts = tmp / s->nb_streams *
+          av_q2d(nut->time_base[tmp % s->nb_streams]) * AV_TIME_BASE;
     ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts);
 
     return 0;
 }
 
-static int find_and_decode_index(NUTContext *nut){
-    AVFormatContext *s= nut->avf;
-    AVIOContext *bc = s->pb;
+//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 filesize = avio_size(bc);
     int64_t *syncpoints;
     int8_t *has_keyframe;
-    int ret= -1;
+    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){
+    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  = 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++){
+    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)
+        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\n");
+        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){
+                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;
+                    has_keyframe[n++] = x & 1;
+                    x >>= 1;
                 }
             }
-            if(has_keyframe[0]){
+            if (has_keyframe[0]) {
                 av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n");
                 goto fail;
             }
-            assert(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);
+            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)){
+    if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
         av_log(s, AV_LOG_ERROR, "index checksum mismatch\n");
         goto fail;
     }
-    ret= 0;
+    ret = 0;
+
 fail:
     av_free(syncpoints);
     av_free(has_keyframe);
     return ret;
 }
 
-static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
+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;
+    nut->avf = s;
 
     /* main header */
-    pos=0;
-    do{
-        pos= find_startcode(bc, MAIN_STARTCODE, pos)+1;
-        if (pos<0+1){
+    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);
+    } 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){
+    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)
+        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);
+    pos = 0;
+    for (;;) {
+        uint64_t startcode = find_any_startcode(bc, pos);
+        pos = avio_tell(bc);
 
-        if(startcode==0){
+        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;
+        } else if (startcode == SYNCPOINT_STARTCODE) {
+            nut->next_startcode = startcode;
             break;
-        }else if(startcode != INFO_STARTCODE){
+        } else if (startcode != INFO_STARTCODE) {
             continue;
         }
 
         decode_info_header(nut);
     }
 
-    s->data_offset= pos-8;
+    s->data_offset = pos - 8;
 
-    if(bc->seekable){
-        int64_t orig_pos= avio_tell(bc);
+    if (bc->seekable) {
+        int64_t orig_pos = avio_tell(bc);
         find_and_decode_index(nut);
         avio_seek(bc, orig_pos, SEEK_SET);
     }
-    assert(nut->next_startcode == SYNCPOINT_STARTCODE);
+    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;
+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);
+    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;
     }
 
@@ -681,86 +761,88 @@ static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id, ui
     reserved_count = nut->frame_code[frame_code].reserved_count;
     *header_idx    = nut->frame_code[frame_code].header_idx;
 
-    if(flags & FLAG_INVALID)
+    if (flags & FLAG_INVALID)
         return AVERROR_INVALIDDATA;
-    if(flags & FLAG_CODED)
+    if (flags & FLAG_CODED)
         flags ^= ffio_read_varlen(bc);
-    if(flags & FLAG_STREAM_ID){
+    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 - (1<<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)
+    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 - (1 << 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 (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){
+    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;
+    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){
+    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;
+    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;
+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)
+    size = decode_frame_header(nut, &pts, &stream_id, &header_idx, frame_code);
+    if (size < 0)
         return size;
 
-    stc= &nut->stream[stream_id];
+    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){
+        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;
     }
 
     av_new_packet(pkt, size + nut->header_len[header_idx]);
     memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]);
-    pkt->pos= avio_tell(bc); //FIXME
+    pkt->pos = avio_tell(bc); // FIXME
     avio_read(bc, pkt->data + nut->header_len[header_idx], size);
 
     pkt->stream_index = stream_id;
@@ -775,135 +857,145 @@ 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;
+    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;
+    for (;;) {
+        int64_t pos  = avio_tell(bc);
+        uint64_t tmp = nut->next_startcode;
+        nut->next_startcode = 0;
 
-        if(tmp){
-            pos-=8;
-        }else{
+        if (tmp) {
+            pos -= 8;
+        } else {
             frame_code = avio_r8(bc);
-            if(bc->eof_reached)
+            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);
+            if (frame_code == 'N') {
+                tmp = frame_code;
+                for (i = 1; i < 8; i++)
+                    tmp = (tmp << 8) + avio_r8(bc);
             }
         }
-        switch(tmp){
+        switch (tmp) {
         case MAIN_STARTCODE:
         case STREAM_STARTCODE:
         case INDEX_STARTCODE:
-            skip= get_packetheader(nut, bc, 0, tmp);
+            skip = get_packetheader(nut, bc, 0, tmp);
             avio_skip(bc, skip);
             break;
         case INFO_STARTCODE:
-            if(decode_info_header(nut)<0)
+            if (decode_info_header(nut) < 0)
                 goto resync;
             break;
         case SYNCPOINT_STARTCODE:
-            if(decode_syncpoint(nut, &ts, &back_ptr)<0)
+            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)
+            ret = decode_frame(nut, pkt, frame_code);
+            if (ret == 0)
                 return 0;
-            else if(ret==1) //ok but discard packet
+            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)
+            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;
+            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){
+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);
+    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){
-            assert(nut->next_startcode == 0);
+    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;
-    assert(nut->last_syncpoint_pos == *pos_arg);
-
-    av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts,back_ptr );
-    if     (stream_index == -1) return pts;
-    else if(stream_index == -2) return back_ptr;
-
-assert(0);
+    } 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};
+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)
+    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{
+        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= av_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_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= av_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
+            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);
+        dummy.pos = pos;
+        sp = av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
+                          NULL);
 
-        assert(sp);
-        pos2= sp->back_ptr  - 15;
+        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);
+    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){
+    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;
+    for (i = 0; i < s->nb_streams; i++)
+        nut->stream[i].skip_until_key_frame = 1;
 
     return 0;
 }
@@ -916,23 +1008,25 @@ static int nut_read_close(AVFormatContext *s)
     av_freep(&nut->time_base);
     av_freep(&nut->stream);
     ff_nut_free_sp(nut);
-    for(i = 1; i < nut->header_count; i++)
+    for (i = 1; i < nut->header_count; i++)
         av_freep(&nut->header[i]);
 
     return 0;
 }
 
-#if CONFIG_NUT_DEMUXER
 AVInputFormat ff_nut_demuxer = {
-    "nut",
-    NULL_IF_CONFIG_SMALL("NUT format"),
-    sizeof(NUTContext),
-    nut_probe,
-    nut_read_header,
-    nut_read_packet,
-    nut_read_close,
-    read_seek,
-    .extensions = "nut",
-    .codec_tag = (const AVCodecTag * const []) { ff_codec_bmp_tags, ff_nut_video_tags, ff_codec_wav_tags, ff_nut_subtitle_tags, 0 },
+    .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      = (const AVCodecTag * const []) {
+        ff_codec_bmp_tags, ff_nut_video_tags, ff_codec_wav_tags,
+        ff_nut_subtitle_tags, 0
+    },
 };
-#endif