@@ -60,6 +60,7 @@ version next:

 - CPiA decoder

 - decimate filter ported from MPlayer

 - RTP depacketization of JPEG

+- Smooth Streaming live segmenter muxer

 version 0.11:

@@ -318,6 +318,7 @@ OBJS-$(CONFIG_SIFF_DEMUXER)              += siff.o

 OBJS-$(CONFIG_SMACKER_DEMUXER)           += smacker.o

 OBJS-$(CONFIG_SMJPEG_DEMUXER)            += smjpegdec.o smjpeg.o

 OBJS-$(CONFIG_SMJPEG_MUXER)              += smjpegenc.o smjpeg.o

+OBJS-$(CONFIG_SMOOTHSTREAMING_MUXER)     += smoothstreamingenc.o

 OBJS-$(CONFIG_SMUSH_DEMUXER)             += smush.o

 OBJS-$(CONFIG_SOL_DEMUXER)               += sol.o pcm.o

 OBJS-$(CONFIG_SOX_DEMUXER)               += soxdec.o pcm.o

@@ -223,6 +223,7 @@ void av_register_all(void)

     REGISTER_DEMUXER  (SIFF, siff);

     REGISTER_DEMUXER  (SMACKER, smacker);

     REGISTER_MUXDEMUX (SMJPEG, smjpeg);

+    REGISTER_MUXER    (SMOOTHSTREAMING, smoothstreaming);

     REGISTER_DEMUXER  (SMUSH, smush);

     REGISTER_DEMUXER  (SOL, sol);

     REGISTER_MUXDEMUX (SOX, sox);

@@ -20,6 +20,7 @@

  */

 #include "libavutil/avstring.h"

+#include "libavutil/opt.h"

 #include "avformat.h"

 #include <fcntl.h>

 #if HAVE_IO_H

@@ -45,9 +46,23 @@

 /* standard file protocol */

 typedef struct FileContext {

+    const AVClass *class;

     int fd;

+    int trunc;

 } FileContext;

+static const AVOption file_options[] = {

+    { "truncate", "Truncate existing files on write", offsetof(FileContext, trunc), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },

+    { NULL }

+};

+

+static const AVClass file_class = {

+    .class_name = "file",

+    .item_name  = av_default_item_name,

+    .option     = file_options,

+    .version    = LIBAVUTIL_VERSION_INT,

+};

+

 static int file_read(URLContext *h, unsigned char *buf, int size)

 {

     FileContext *c = h->priv_data;

@@ -93,9 +108,13 @@ static int file_open(URLContext *h, const char *filename, int flags)

     av_strstart(filename, "file:", &filename);

     if (flags & AVIO_FLAG_WRITE && flags & AVIO_FLAG_READ) {

-        access = O_CREAT | O_TRUNC | O_RDWR;

+        access = O_CREAT | O_RDWR;

+        if (c->trunc)

+            access |= O_TRUNC;

     } else if (flags & AVIO_FLAG_WRITE) {

-        access = O_CREAT | O_TRUNC | O_WRONLY;

+        access = O_CREAT | O_WRONLY;

+        if (c->trunc)

+            access |= O_TRUNC;

     } else {

         access = O_RDONLY;

     }

@@ -140,6 +159,7 @@ URLProtocol ff_file_protocol = {

     .url_get_file_handle = file_get_handle,

     .url_check           = file_check,

     .priv_data_size      = sizeof(FileContext),

+    .priv_data_class     = &file_class,

 };

 #endif /* CONFIG_FILE_PROTOCOL */

@@ -812,7 +812,8 @@ static int mpegts_push_data(MpegTSFilter *filter,

                     code = pes->header[3] | 0x100;

                     av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);

-                    if ((pes->st && pes->st->discard == AVDISCARD_ALL) ||

+                    if ((pes->st && pes->st->discard == AVDISCARD_ALL &&

+                         (!pes->sub_st || pes->sub_st->discard == AVDISCARD_ALL)) ||

                         code == 0x1be) /* padding_stream */

                         goto skip;

@@ -47,6 +47,13 @@

 #  define fstat(f,s) _fstati64((f), (s))

 #endif /* defined(__MINGW32__) && !defined(__MINGW32CE__) */

+#ifdef _WIN32

+#include <direct.h>

+#define mkdir(a, b) _mkdir(a)

+#else

+#include <sys/stat.h>

+#endif

+

 static inline int is_dos_path(const char *path)

 {

 #if HAVE_DOS_PATHS

@@ -23,6 +23,7 @@

 #include "rtpdec_formats.h"

 #include "libavutil/intreadwrite.h"

 #include "libavcodec/mjpeg.h"

+#include "libavcodec/bytestream.h"

 /**

  * RTP/JPEG specific private data.

@@ -31,6 +32,8 @@ struct PayloadContext {

     AVIOContext *frame;         ///< current frame buffer

     uint32_t    timestamp;      ///< current frame timestamp

     int         hdr_size;       ///< size of the current frame header

+    uint8_t     qtables[128][128];

+    uint8_t     qtables_len[128];

 };

 static const uint8_t default_quantizers[128] = {

@@ -76,120 +79,120 @@ static void jpeg_free_context(PayloadContext *jpeg)

     av_free(jpeg);

 }

-static void jpeg_create_huffman_table(PutBitContext *p, int table_class,

-                                      int table_id, const uint8_t *bits_table,

-                                      const uint8_t *value_table)

+static int jpeg_create_huffman_table(PutByteContext *p, int table_class,

+                                     int table_id, const uint8_t *bits_table,

+                                     const uint8_t *value_table)

 {

     int i, n = 0;

-    put_bits(p, 8, 0);

-    put_bits(p, 4, table_class);

-    put_bits(p, 4, table_id);

+    bytestream2_put_byte(p, table_class << 4 | table_id);

     for (i = 1; i <= 16; i++) {

         n += bits_table[i];

-        put_bits(p, 8, bits_table[i]);

+        bytestream2_put_byte(p, bits_table[i]);

     }

     for (i = 0; i < n; i++) {

-        put_bits(p, 8, value_table[i]);

+        bytestream2_put_byte(p, value_table[i]);

     }

+    return n + 17;

+}

+

+static void jpeg_put_marker(PutByteContext *pbc, int code)

+{

+    bytestream2_put_byte(pbc, 0xff);

+    bytestream2_put_byte(pbc, code);

 }

 static int jpeg_create_header(uint8_t *buf, int size, uint32_t type, uint32_t w,

                               uint32_t h, const uint8_t *qtable, int nb_qtable)

 {

-    PutBitContext pbc;

+    PutByteContext pbc;

+    uint8_t *dht_size_ptr;

+    int dht_size, i;

-    init_put_bits(&pbc, buf, size);

+    bytestream2_init_writer(&pbc, buf, size);

     /* Convert from blocks to pixels. */

     w <<= 3;

     h <<= 3;

     /* SOI */

-    put_marker(&pbc, SOI);

+    jpeg_put_marker(&pbc, SOI);

     /* JFIF header */

-    put_marker(&pbc, APP0);

-    put_bits(&pbc, 16, 16);

-    avpriv_put_string(&pbc, "JFIF", 1);

-    put_bits(&pbc, 16, 0x0201);

-    put_bits(&pbc, 8, 0);

-    put_bits(&pbc, 16, 1);

-    put_bits(&pbc, 16, 1);

-    put_bits(&pbc, 8, 0);

-    put_bits(&pbc, 8, 0);

+    jpeg_put_marker(&pbc, APP0);

+    bytestream2_put_be16(&pbc, 16);

+    bytestream2_put_buffer(&pbc, "JFIF", 5);

+    bytestream2_put_be16(&pbc, 0x0201);

+    bytestream2_put_byte(&pbc, 0);

+    bytestream2_put_be16(&pbc, 1);

+    bytestream2_put_be16(&pbc, 1);

+    bytestream2_put_byte(&pbc, 0);

+    bytestream2_put_byte(&pbc, 0);

     /* DQT */

-    put_marker(&pbc, DQT);

-    if (nb_qtable == 2) {

-        put_bits(&pbc, 16, 2 + 2 * (1 + 64));

-    } else {

-        put_bits(&pbc, 16, 2 + 1 * (1 + 64));

-    }

-    put_bits(&pbc, 8, 0);

+    jpeg_put_marker(&pbc, DQT);

+    bytestream2_put_be16(&pbc, 2 + nb_qtable * (1 + 64));

-    /* Each table is an array of 64 values given in zig-zag

-     * order, identical to the format used in a JFIF DQT

-     * marker segment. */

-    avpriv_copy_bits(&pbc, qtable, 64 * 8);

+    for (i = 0; i < nb_qtable; i++) {

+        bytestream2_put_byte(&pbc, i);

-    if (nb_qtable == 2) {

-        put_bits(&pbc, 8, 1);

-        avpriv_copy_bits(&pbc, qtable + 64, 64 * 8);

+        /* Each table is an array of 64 values given in zig-zag

+         * order, identical to the format used in a JFIF DQT

+         * marker segment. */

+        bytestream2_put_buffer(&pbc, qtable + 64 * i, 64);

     }

     /* DHT */

-    put_marker(&pbc, DHT);

-

-    jpeg_create_huffman_table(&pbc, 0, 0, avpriv_mjpeg_bits_dc_luminance,

-                              avpriv_mjpeg_val_dc);

-    jpeg_create_huffman_table(&pbc, 0, 1, avpriv_mjpeg_bits_dc_chrominance,

-                              avpriv_mjpeg_val_dc);

-    jpeg_create_huffman_table(&pbc, 1, 0, avpriv_mjpeg_bits_ac_luminance,

-                              avpriv_mjpeg_val_ac_luminance);

-    jpeg_create_huffman_table(&pbc, 1, 1, avpriv_mjpeg_bits_ac_chrominance,

-                              avpriv_mjpeg_val_ac_chrominance);

+    jpeg_put_marker(&pbc, DHT);

+    dht_size_ptr = pbc.buffer;

+    bytestream2_put_be16(&pbc, 0);

+

+    dht_size  = 2;

+    dht_size += jpeg_create_huffman_table(&pbc, 0, 0,avpriv_mjpeg_bits_dc_luminance,

+                                          avpriv_mjpeg_val_dc);

+    dht_size += jpeg_create_huffman_table(&pbc, 0, 1, avpriv_mjpeg_bits_dc_chrominance,

+                                          avpriv_mjpeg_val_dc);

+    dht_size += jpeg_create_huffman_table(&pbc, 1, 0, avpriv_mjpeg_bits_ac_luminance,

+                                          avpriv_mjpeg_val_ac_luminance);

+    dht_size += jpeg_create_huffman_table(&pbc, 1, 1, avpriv_mjpeg_bits_ac_chrominance,

+                                          avpriv_mjpeg_val_ac_chrominance);

+    AV_WB16(dht_size_ptr, dht_size);

     /* SOF0 */

-    put_marker(&pbc, SOF0);

-    put_bits(&pbc, 16, 17);

-    put_bits(&pbc, 8, 8);

-    put_bits(&pbc, 8, h >> 8);

-    put_bits(&pbc, 8, h);

-    put_bits(&pbc, 8, w >> 8);

-    put_bits(&pbc, 8, w);

-    put_bits(&pbc, 8, 3);

-    put_bits(&pbc, 8, 1);

-    put_bits(&pbc, 8, type ? 34 : 33);

-    put_bits(&pbc, 8, 0);

-    put_bits(&pbc, 8, 2);

-    put_bits(&pbc, 8, 17);

-    put_bits(&pbc, 8, nb_qtable == 2 ? 1 : 0);

-    put_bits(&pbc, 8, 3);

-    put_bits(&pbc, 8, 17);

-    put_bits(&pbc, 8, nb_qtable == 2 ? 1 : 0);

+    jpeg_put_marker(&pbc, SOF0);

+    bytestream2_put_be16(&pbc, 17); /* size */

+    bytestream2_put_byte(&pbc, 8); /* bits per component */

+    bytestream2_put_be16(&pbc, h);

+    bytestream2_put_be16(&pbc, w);

+    bytestream2_put_byte(&pbc, 3); /* number of components */

+    bytestream2_put_byte(&pbc, 1); /* component number */

+    bytestream2_put_byte(&pbc, (2 << 4) | (type ? 2 : 1)); /* hsample/vsample */

+    bytestream2_put_byte(&pbc, 0); /* matrix number */

+    bytestream2_put_byte(&pbc, 2); /* component number */

+    bytestream2_put_byte(&pbc, 1 << 4 | 1); /* hsample/vsample */

+    bytestream2_put_byte(&pbc, nb_qtable == 2 ? 1 : 0); /* matrix number */

+    bytestream2_put_byte(&pbc, 3); /* component number */

+    bytestream2_put_byte(&pbc, 1 << 4 | 1); /* hsample/vsample */

+    bytestream2_put_byte(&pbc, nb_qtable == 2 ? 1 : 0); /* matrix number */

     /* SOS */

-    put_marker(&pbc, SOS);

-    put_bits(&pbc, 16, 12);

-    put_bits(&pbc, 8, 3);

-    put_bits(&pbc, 8, 1);

-    put_bits(&pbc, 8, 0);

-    put_bits(&pbc, 8, 2);

-    put_bits(&pbc, 8, 17);

-    put_bits(&pbc, 8, 3);

-    put_bits(&pbc, 8, 17);

-    put_bits(&pbc, 8, 0);

-    put_bits(&pbc, 8, 63);

-    put_bits(&pbc, 8, 0);

-

-    /* Fill the buffer. */

-    flush_put_bits(&pbc);

+    jpeg_put_marker(&pbc, SOS);

+    bytestream2_put_be16(&pbc, 12);

+    bytestream2_put_byte(&pbc, 3);

+    bytestream2_put_byte(&pbc, 1);

+    bytestream2_put_byte(&pbc, 0);

+    bytestream2_put_byte(&pbc, 2);

+    bytestream2_put_byte(&pbc, 17);

+    bytestream2_put_byte(&pbc, 3);

+    bytestream2_put_byte(&pbc, 17);

+    bytestream2_put_byte(&pbc, 0);

+    bytestream2_put_byte(&pbc, 63);

+    bytestream2_put_byte(&pbc, 0);

     /* Return the length in bytes of the JPEG header. */

-    return put_bits_count(&pbc) / 8;

+    return bytestream2_tell_p(&pbc);

 }

 static void create_default_qtables(uint8_t *qtables, uint8_t q)

@@ -243,46 +246,76 @@ static int jpeg_parse_packet(AVFormatContext *ctx, PayloadContext *jpeg,

                "Unimplemented RTP/JPEG restart marker header.\n");

         return AVERROR_PATCHWELCOME;

     }

+    if (type > 1) {

+        av_log(ctx, AV_LOG_ERROR, "Unimplemented RTP/JPEG type %d\n", type);

+        return AVERROR_PATCHWELCOME;

+    }

     /* Parse the quantization table header. */

-    if (q > 127 && off == 0) {

-        uint8_t precision;

-

-        if (len < 4) {

-            av_log(ctx, AV_LOG_ERROR, "Too short RTP/JPEG packet.\n");

-            return AVERROR_INVALIDDATA;

-        }

-

-        /* The first byte is reserved for future use. */

-        precision  = AV_RB8(buf + 1);    /* size of coefficients */

-        qtable_len = AV_RB16(buf + 2);   /* length in bytes */

-        buf += 4;

-        len -= 4;

-

-        if (precision)

-            av_log(ctx, AV_LOG_WARNING, "Only 8-bit precision is supported.\n");

-

-        if (q == 255 && qtable_len == 0) {

-            av_log(ctx, AV_LOG_ERROR,

-                   "Invalid RTP/JPEG packet. Quantization tables not found.\n");

-            return AVERROR_INVALIDDATA;

-        }

+    if (off == 0) {

+        /* Start of JPEG data packet. */

+        uint8_t new_qtables[128];

+        uint8_t hdr[1024];

-        if (qtable_len > 0) {

-            if (len < qtable_len) {

+        if (q > 127) {

+            uint8_t precision;

+            if (len < 4) {

                 av_log(ctx, AV_LOG_ERROR, "Too short RTP/JPEG packet.\n");

                 return AVERROR_INVALIDDATA;

             }

-            qtables = buf;

-            buf += qtable_len;

-            len -= qtable_len;

-        }

-    }

-    if (off == 0) {

-        /* Start of JPEG data packet. */

-        uint8_t new_qtables[128];

-        uint8_t hdr[1024];

+            /* The first byte is reserved for future use. */

+            precision  = AV_RB8(buf + 1);    /* size of coefficients */

+            qtable_len = AV_RB16(buf + 2);   /* length in bytes */

+            buf += 4;

+            len -= 4;

+

+            if (precision)

+                av_log(ctx, AV_LOG_WARNING, "Only 8-bit precision is supported.\n");

+

+            if (qtable_len > 0) {

+                if (len < qtable_len) {

+                    av_log(ctx, AV_LOG_ERROR, "Too short RTP/JPEG packet.\n");

+                    return AVERROR_INVALIDDATA;

+                }

+                qtables = buf;

+                buf += qtable_len;

+                len -= qtable_len;

+                if (q < 255) {

+                    if (jpeg->qtables_len[q - 128] &&

+                        (jpeg->qtables_len[q - 128] != qtable_len ||

+                         memcmp(qtables, &jpeg->qtables[q - 128][0], qtable_len))) {

+                        av_log(ctx, AV_LOG_WARNING,

+                               "Quantization tables for q=%d changed\n", q);

+                    } else if (!jpeg->qtables_len[q - 128] && qtable_len <= 128) {

+                        memcpy(&jpeg->qtables[q - 128][0], qtables,

+                               qtable_len);

+                        jpeg->qtables_len[q - 128] = qtable_len;

+                    }

+                }

+            } else {

+                if (q == 255) {

+                    av_log(ctx, AV_LOG_ERROR,

+                           "Invalid RTP/JPEG packet. Quantization tables not found.\n");

+                    return AVERROR_INVALIDDATA;

+                }

+                if (!jpeg->qtables_len[q - 128]) {

+                    av_log(ctx, AV_LOG_ERROR,

+                           "No quantization tables known for q=%d yet.\n", q);

+                    return AVERROR_INVALIDDATA;

+                }

+                qtables    = &jpeg->qtables[q - 128][0];

+                qtable_len =  jpeg->qtables_len[q - 128];

+            }

+        } else { /* q <= 127 */

+            if (q == 0 || q > 99) {

+                av_log(ctx, AV_LOG_ERROR, "Reserved q value %d\n", q);

+                return AVERROR_INVALIDDATA;

+            }

+            create_default_qtables(new_qtables, q);

+            qtables    = new_qtables;

+            qtable_len = sizeof(new_qtables);

+        }

         /* Skip the current frame in case of the end packet

          * has been lost somewhere. */

@@ -292,18 +325,12 @@ static int jpeg_parse_packet(AVFormatContext *ctx, PayloadContext *jpeg,

             return ret;

         jpeg->timestamp = *timestamp;

-        if (!qtables) {

-            create_default_qtables(new_qtables, q);

-            qtables    = new_qtables;

-            qtable_len = sizeof(new_qtables);

-        }

-

         /* Generate a frame and scan headers that can be prepended to the

          * RTP/JPEG data payload to produce a JPEG compressed image in

          * interchange format. */

         jpeg->hdr_size = jpeg_create_header(hdr, sizeof(hdr), type, width,

                                             height, qtables,

-                                            qtable_len > 64 ? 2 : 1);

+                                            qtable_len / 64);

         /* Copy JPEG header to frame buffer. */

         avio_write(jpeg->frame, hdr, jpeg->hdr_size);

@@ -334,13 +361,9 @@ static int jpeg_parse_packet(AVFormatContext *ctx, PayloadContext *jpeg,

     if (flags & RTP_FLAG_MARKER) {

         /* End of JPEG data packet. */

-        PutBitContext pbc;

-        uint8_t buf[2];

+        uint8_t buf[2] = { 0xff, EOI };

         /* Put EOI marker. */

-        init_put_bits(&pbc, buf, sizeof(buf));

-        put_marker(&pbc, EOI);

-        flush_put_bits(&pbc);

         avio_write(jpeg->frame, buf, sizeof(buf));

         /* Prepare the JPEG packet. */

new file mode 100644

@@ -0,0 +1,621 @@

+/*

+ * Live smooth streaming fragmenter

+ * Copyright (c) 2012 Martin Storsjo

+ *

+ * 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 "config.h"

+#include <float.h>

+#if HAVE_UNISTD_H

+#include <unistd.h>

+#endif

+

+#include "avformat.h"

+#include "internal.h"

+#include "os_support.h"

+#include "avc.h"

+#include "url.h"

+

+#include "libavutil/opt.h"

+#include "libavutil/avstring.h"

+#include "libavutil/mathematics.h"

+#include "libavutil/intreadwrite.h"

+

+typedef struct {

+    char file[1024];

+    char infofile[1024];

+    int64_t start_time, duration;

+    int n;

+    int64_t start_pos, size;

+} Fragment;

+

+typedef struct {

+    AVFormatContext *ctx;

+    int ctx_inited;

+    char dirname[1024];

+    uint8_t iobuf[32768];

+    URLContext *out;  // Current output stream where all output is written

+    URLContext *out2; // Auxillary output stream where all output also is written

+    URLContext *tail_out; // The actual main output stream, if we're currently seeked back to write elsewhere

+    int64_t tail_pos, cur_pos, cur_start_pos;

+    int packets_written;

+    const char *stream_type_tag;

+    int nb_fragments, fragments_size, fragment_index;

+    Fragment **fragments;

+

+    const char *fourcc;

+    char *private_str;

+    int packet_size;

+    int audio_tag;

+} OutputStream;

+

+typedef struct {

+    const AVClass *class;  /* Class for private options. */

+    int window_size;

+    int extra_window_size;

+    int lookahead_count;

+    int min_frag_duration;

+    int remove_at_exit;

+    OutputStream *streams;

+    int has_video, has_audio;

+    int nb_fragments;

+} SmoothStreamingContext;

+

+static int ism_write(void *opaque, uint8_t *buf, int buf_size)

+{

+    OutputStream *os = opaque;

+    if (os->out)

+        ffurl_write(os->out, buf, buf_size);

+    if (os->out2)

+        ffurl_write(os->out2, buf, buf_size);

+    os->cur_pos += buf_size;

+    if (os->cur_pos >= os->tail_pos)

+        os->tail_pos = os->cur_pos;

+    return buf_size;

+}

+

+static int64_t ism_seek(void *opaque, int64_t offset, int whence)

+{

+    OutputStream *os = opaque;

+    int i;

+    if (whence != SEEK_SET)

+        return AVERROR(ENOSYS);

+    if (os->tail_out) {

+        if (os->out) {

+            ffurl_close(os->out);

+        }

+        if (os->out2) {

+            ffurl_close(os->out2);

+        }

+        os->out = os->tail_out;

+        os->out2 = NULL;

+        os->tail_out = NULL;

+    }

+    if (offset >= os->cur_start_pos) {

+        ffurl_seek(os->out, offset - os->cur_start_pos, SEEK_SET);

+        os->cur_pos = offset;

+        return offset;

+    }

+    for (i = os->nb_fragments - 1; i >= 0; i--) {

+        Fragment *frag = os->fragments[i];

+        if (offset >= frag->start_pos && offset < frag->start_pos + frag->size) {

+            int ret;

+            AVDictionary *opts = NULL;

+            os->tail_out = os->out;

+            av_dict_set(&opts, "truncate", "0", 0);

+            ret = ffurl_open(&os->out, frag->file, AVIO_FLAG_READ_WRITE, &os->ctx->interrupt_callback, &opts);

+            av_dict_free(&opts);

+            if (ret < 0) {

+                os->out = os->tail_out;

+                os->tail_out = NULL;

+                return ret;

+            }

+            av_dict_set(&opts, "truncate", "0", 0);

+            ffurl_open(&os->out2, frag->infofile, AVIO_FLAG_READ_WRITE, &os->ctx->interrupt_callback, &opts);

+            av_dict_free(&opts);

+            ffurl_seek(os->out, offset - frag->start_pos, SEEK_SET);

+            if (os->out2)

+                ffurl_seek(os->out2, offset - frag->start_pos, SEEK_SET);

+            os->cur_pos = offset;

+            return offset;

+        }

+    }

+    return AVERROR(EIO);

+}

+

+static void get_private_data(OutputStream *os)

+{

+    AVCodecContext *codec = os->ctx->streams[0]->codec;

+    uint8_t *ptr = codec->extradata;

+    int size = codec->extradata_size;

+    int i;

+    if (codec->codec_id == AV_CODEC_ID_H264) {

+        ff_avc_write_annexb_extradata(ptr, &ptr, &size);

+        if (!ptr)

+            ptr = codec->extradata;

+    }

+    if (!ptr)

+        return;

+    os->private_str = av_mallocz(2*size + 1);

+    for (i = 0; i < size; i++)

+        snprintf(&os->private_str[2*i], 3, "%02x", ptr[i]);

+    if (ptr != codec->extradata)

+        av_free(ptr);

+}

+

+static void ism_free(AVFormatContext *s)

+{

+    SmoothStreamingContext *c = s->priv_data;

+    int i, j;

+    if (!c->streams)

+        return;

+    for (i = 0; i < s->nb_streams; i++) {

+        OutputStream *os = &c->streams[i];

+        ffurl_close(os->out);

+        ffurl_close(os->out2);

+        ffurl_close(os->tail_out);

+        os->out = os->out2 = os->tail_out = NULL;

+        if (os->ctx && os->ctx_inited)

+            av_write_trailer(os->ctx);

+        if (os->ctx && os->ctx->pb)

+            av_free(os->ctx->pb);

+        if (os->ctx)

+            avformat_free_context(os->ctx);

+        av_free(os->private_str);

+        for (j = 0; j < os->nb_fragments; j++)

+            av_free(os->fragments[j]);

+        av_free(os->fragments);

+    }

+    av_freep(&c->streams);

+}

+

+static int ism_write_header(AVFormatContext *s)

+{

+    SmoothStreamingContext *c = s->priv_data;

+    int ret = 0, i;

+    AVOutputFormat *oformat;

+

+    ret = mkdir(s->filename, 0777);

+    if (ret) {

+        av_log(s, AV_LOG_ERROR, "mkdir(%s): %s\n", s->filename, strerror(errno));

+        return AVERROR(errno);

+    }

+    ret = 0;

+

+    oformat = av_guess_format("ismv", NULL, NULL);

+    if (!oformat) {

+        ret = AVERROR_MUXER_NOT_FOUND;

+        goto fail;

+    }

+

+    c->streams = av_mallocz(sizeof(*c->streams) * s->nb_streams);

+    if (!c->streams) {

+        ret = AVERROR(ENOMEM);

+        goto fail;

+    }

+

+    for (i = 0; i < s->nb_streams; i++) {

+        OutputStream *os = &c->streams[i];

+        AVFormatContext *ctx;

+        AVStream *st;

+        AVDictionary *opts = NULL;

+        char buf[10];

+

+        if (!s->streams[i]->codec->bit_rate) {

+            av_log(s, AV_LOG_ERROR, "No bit rate set for stream %d\n", i);

+            ret = AVERROR(EINVAL);

+            goto fail;

+        }

+        snprintf(os->dirname, sizeof(os->dirname), "%s/QualityLevels(%d)", s->filename, s->streams[i]->codec->bit_rate);

+        mkdir(os->dirname, 0777);

+

+        ctx = avformat_alloc_context();

+        if (!ctx) {

+            ret = AVERROR(ENOMEM);

+            goto fail;

+        }

+        os->ctx = ctx;

+        ctx->oformat = oformat;

+        ctx->interrupt_callback = s->interrupt_callback;

+

+        if (!(st = avformat_new_stream(ctx, NULL))) {

+            ret = AVERROR(ENOMEM);

+            goto fail;

+        }

+        avcodec_copy_context(st->codec, s->streams[i]->codec);

+

+        ctx->pb = avio_alloc_context(os->iobuf, sizeof(os->iobuf), AVIO_FLAG_WRITE, os, NULL, ism_write, ism_seek);

+        if (!ctx->pb) {

+            ret = AVERROR(ENOMEM);

+            goto fail;

+        }

+

+        snprintf(buf, sizeof(buf), "%d", c->lookahead_count);

+        av_dict_set(&opts, "ism_lookahead", buf, 0);

+        av_dict_set(&opts, "movflags", "frag_custom", 0);

+        if ((ret = avformat_write_header(ctx, &opts)) < 0) {

+             goto fail;

+        }

+        os->ctx_inited = 1;

+        avio_flush(ctx->pb);

+        av_dict_free(&opts);

+        s->streams[i]->time_base = st->time_base;

+        if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

+            c->has_video = 1;

+            os->stream_type_tag = "video";

+            if (st->codec->codec_id == AV_CODEC_ID_H264) {

+                os->fourcc = "H264";

+            } else if (st->codec->codec_id == AV_CODEC_ID_VC1) {

+                os->fourcc = "WVC1";

+            } else {

+                av_log(s, AV_LOG_ERROR, "Unsupported video codec\n");

+                ret = AVERROR(EINVAL);

+                goto fail;

+            }

+        } else {

+            c->has_audio = 1;

+            os->stream_type_tag = "audio";

+            if (st->codec->codec_id == AV_CODEC_ID_AAC) {

+                os->fourcc = "AACL";

+                os->audio_tag = 0xff;

+            } else if (st->codec->codec_id == AV_CODEC_ID_WMAPRO) {

+                os->fourcc = "WMAP";

+                os->audio_tag = 0x0162;

+            } else {

+                av_log(s, AV_LOG_ERROR, "Unsupported audio codec\n");

+                ret = AVERROR(EINVAL);

+                goto fail;

+            }

+            os->packet_size = st->codec->block_align ? st->codec->block_align : 4;

+        }

+        get_private_data(os);

+    }

+

+    if (!c->has_video && c->min_frag_duration <= 0) {

+        av_log(s, AV_LOG_WARNING, "no video stream and no min frag duration set\n");

+        ret = AVERROR(EINVAL);

+    }

+

+fail:

+    if (ret)

+        ism_free(s);

+    return ret;

+}

+

+static int parse_fragment(AVFormatContext *s, const char *filename, int64_t *start_ts, int64_t *duration, int64_t *moof_size, int64_t size)

+{

+    AVIOContext *in;

+    int ret;

+    uint32_t len;

+    if ((ret = avio_open2(&in, filename, AVIO_FLAG_READ, &s->interrupt_callback, NULL)) < 0)

+        return ret;

+    ret = AVERROR(EIO);

+    *moof_size = avio_rb32(in);

+    if (*moof_size < 8 || *moof_size > size)

+        goto fail;

+    if (avio_rl32(in) != MKTAG('m','o','o','f'))

+        goto fail;

+    len = avio_rb32(in);

+    if (len > *moof_size)

+        goto fail;

+    if (avio_rl32(in) != MKTAG('m','f','h','d'))

+        goto fail;

+    avio_seek(in, len - 8, SEEK_CUR);

+    avio_rb32(in); /* traf size */

+    if (avio_rl32(in) != MKTAG('t','r','a','f'))

+        goto fail;

+    while (avio_tell(in) < *moof_size) {

+        uint32_t len = avio_rb32(in);

+        uint32_t tag = avio_rl32(in);

+        int64_t end = avio_tell(in) + len - 8;

+        if (len < 8 || len >= *moof_size)

+            goto fail;

+        if (tag == MKTAG('u','u','i','d')) {

+            const uint8_t tfxd[] = {

+                0x6d, 0x1d, 0x9b, 0x05, 0x42, 0xd5, 0x44, 0xe6,

+                0x80, 0xe2, 0x14, 0x1d, 0xaf, 0xf7, 0x57, 0xb2

+            };

+            uint8_t uuid[16];

+            avio_read(in, uuid, 16);

+            if (!memcmp(uuid, tfxd, 16) && len >= 8 + 16 + 4 + 16) {

+                avio_seek(in, 4, SEEK_CUR);

+                *start_ts = avio_rb64(in);

+                *duration = avio_rb64(in);

+                ret = 0;

+                break;

+            }

+        }

+        avio_seek(in, end, SEEK_SET);

+    }

+fail:

+    avio_close(in);

+    return ret;

+}

+

+static int add_fragment(OutputStream *os, const char *file, const char *infofile, int64_t start_time, int64_t duration, int64_t start_pos, int64_t size)

+{

+    Fragment *frag;

+    if (os->nb_fragments >= os->fragments_size) {

+        os->fragments_size = (os->fragments_size + 1) * 2;

+        os->fragments = av_realloc(os->fragments, sizeof(*os->fragments)*os->fragments_size);

+        if (!os->fragments)

+            return AVERROR(ENOMEM);

+    }

+    frag = av_mallocz(sizeof(*frag));

+    if (!frag)

+        return AVERROR(ENOMEM);

+    av_strlcpy(frag->file, file, sizeof(frag->file));

+    av_strlcpy(frag->infofile, infofile, sizeof(frag->infofile));

+    frag->start_time = start_time;

+    frag->duration = duration;

+    frag->start_pos = start_pos;

+    frag->size = size;

+    frag->n = os->fragment_index;

+    os->fragments[os->nb_fragments++] = frag;

+    os->fragment_index++;

+    return 0;

+}

+

+static int copy_moof(AVFormatContext *s, const char* infile, const char *outfile, int64_t size)

+{

+    AVIOContext *in, *out;

+    int ret = 0;

+    if ((ret = avio_open2(&in, infile, AVIO_FLAG_READ, &s->interrupt_callback, NULL)) < 0)

+        return ret;

+    if ((ret = avio_open2(&out, outfile, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL)) < 0) {

+        avio_close(in);

+        return ret;

+    }

+    while (size > 0) {

+        uint8_t buf[8192];

+        int n = FFMIN(size, sizeof(buf));

+        n = avio_read(in, buf, n);

+        if (n <= 0) {

+            ret = AVERROR(EIO);

+            break;

+        }

+        avio_write(out, buf, n);

+        size -= n;

+    }

+    avio_flush(out);

+    avio_close(out);

+    avio_close(in);

+    return ret;

+}

+

+static void output_chunk_list(OutputStream *os, AVIOContext *out, int final, int skip, int window_size)

+{

+    int removed = 0, i, start = 0;

+    if (os->nb_fragments <= 0)

+        return;

+    if (os->fragments[0]->n > 0)

+        removed = 1;