From 33ec9ef96d4220c4c846a5d3f2e95ba528b8bb16 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Storsj=C3=B6?= <martin@martin.st>
Date: Mon, 9 Jan 2012 18:27:33 +0200
Subject: Add a tool for creating smooth streaming manifests
MIME-Version: 1.0
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It can also optionally split the file into individual fragments,
which allows it to be served from any web server without any
server side support.

Signed-off-by: Martin Storsjö <martin@martin.st>
---
 tools/ismindex.c | 514 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 514 insertions(+)
 create mode 100644 tools/ismindex.c

(limited to 'tools')

diff --git a/tools/ismindex.c b/tools/ismindex.c
new file mode 100644
index 0000000000..4e14d1970f
--- /dev/null
+++ b/tools/ismindex.c
@@ -0,0 +1,514 @@
+/*
+ * Copyright (c) 2012 Martin Storsjo
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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,
+ * 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
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * To create a simple file for smooth streaming:
+ * avconv <normal input/transcoding options> -movflags frag_keyframe foo.ismv
+ * ismindex -n foo foo.ismv
+ * This step creates foo.ism and foo.ismc that is required by IIS for
+ * serving it.
+ *
+ * To pre-split files for serving as static files by a web server without
+ * any extra server support, create the ismv file as above, and split it:
+ * ismindex -split foo.ismv
+ * This step creates a file Manifest and directories QualityLevel(...),
+ * that can be read directly by a smooth streaming player.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <sys/stat.h>
+#include "libavformat/avformat.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/mathematics.h"
+
+static int usage(const char *argv0, int ret)
+{
+    fprintf(stderr, "%s [-split] [-n basename] file1 [file2] ...\n", argv0);
+    return ret;
+}
+
+struct MoofOffset {
+    int64_t time;
+    int64_t offset;
+    int duration;
+};
+
+struct VideoFile {
+    const char *name;
+    int64_t duration;
+    int bitrate;
+    int track_id;
+    int is_audio, is_video;
+    int width, height;
+    int chunks;
+    int sample_rate, channels;
+    uint8_t *codec_private;
+    int codec_private_size;
+    struct MoofOffset *offsets;
+    int timescale;
+    const char *fourcc;
+    int blocksize;
+    int tag;
+};
+
+struct VideoFiles {
+    int nb_files;
+    int64_t duration;
+    struct VideoFile **files;
+    int video_file, audio_file;
+    int nb_video_files, nb_audio_files;
+};
+
+static int copy_tag(AVIOContext *in, AVIOContext *out, int32_t tag_name)
+{
+    int32_t size, tag;
+
+    size = avio_rb32(in);
+    tag = avio_rb32(in);
+    avio_wb32(out, size);
+    avio_wb32(out, tag);
+    if (tag != tag_name)
+        return -1;
+    size -= 8;
+    while (size > 0) {
+        char buf[1024];
+        int len = FFMIN(sizeof(buf), size);
+        if (avio_read(in, buf, len) != len)
+            break;
+        avio_write(out, buf, len);
+        size -= len;
+    }
+    return 0;
+}
+
+static int write_fragment(const char *filename, AVIOContext *in)
+{
+    AVIOContext *out = NULL;
+    int ret;
+
+    if ((ret = avio_open2(&out, filename, AVIO_FLAG_WRITE, NULL, NULL)) < 0)
+        return ret;
+    copy_tag(in, out, MKBETAG('m', 'o', 'o', 'f'));
+    copy_tag(in, out, MKBETAG('m', 'd', 'a', 't'));
+
+    avio_flush(out);
+    avio_close(out);
+
+    return ret;
+}
+
+static int write_fragments(struct VideoFiles *files, int start_index,
+                           AVIOContext *in)
+{
+    char dirname[100], filename[500];
+    int i, j;
+
+    for (i = start_index; i < files->nb_files; i++) {
+        struct VideoFile *vf = files->files[i];
+        const char *type = vf->is_video ? "video" : "audio";
+        snprintf(dirname, sizeof(dirname), "QualityLevels(%d)", vf->bitrate);
+        mkdir(dirname, 0777);
+        for (j = 0; j < vf->chunks; j++) {
+            snprintf(filename, sizeof(filename), "%s/Fragments(%s=%"PRId64")",
+                     dirname, type, vf->offsets[j].time);
+            avio_seek(in, vf->offsets[j].offset, SEEK_SET);
+            write_fragment(filename, in);
+        }
+    }
+    return 0;
+}
+
+static int read_tfra(struct VideoFiles *files, int start_index, AVIOContext *f)
+{
+    int ret = AVERROR_EOF, track_id;
+    int version, fieldlength, i, j;
+    int64_t pos = avio_tell(f);
+    uint32_t size = avio_rb32(f);
+    struct VideoFile *vf = NULL;
+
+    if (avio_rb32(f) != MKBETAG('t', 'f', 'r', 'a'))
+        goto fail;
+    version = avio_r8(f);
+    avio_rb24(f);
+    track_id = avio_rb32(f); /* track id */
+    for (i = start_index; i < files->nb_files && !vf; i++) {
+        if (files->files[i]->track_id == track_id)
+            vf = files->files[i];
+    }
+    if (!vf) {
+        /* Ok, continue parsing the next atom */
+        ret = 0;
+        goto fail;
+    }
+    fieldlength = avio_rb32(f);
+    vf->chunks = avio_rb32(f);
+    vf->offsets = av_mallocz(sizeof(*vf->offsets) * vf->chunks);
+    if (!vf->offsets) {
+        ret = AVERROR(ENOMEM);
+        goto fail;
+    }
+    for (i = 0; i < vf->chunks; i++) {
+        if (version == 1) {
+            vf->offsets[i].time = avio_rb64(f);
+            vf->offsets[i].offset = avio_rb64(f);
+        } else {
+            vf->offsets[i].time = avio_rb32(f);
+            vf->offsets[i].offset = avio_rb32(f);
+        }
+        for (j = 0; j < ((fieldlength >> 4) & 3) + 1; j++)
+            avio_r8(f);
+        for (j = 0; j < ((fieldlength >> 2) & 3) + 1; j++)
+            avio_r8(f);
+        for (j = 0; j < ((fieldlength >> 0) & 3) + 1; j++)
+            avio_r8(f);
+        if (i > 0)
+            vf->offsets[i - 1].duration = vf->offsets[i].time -
+                                          vf->offsets[i - 1].time;
+    }
+    if (vf->chunks > 0)
+        vf->offsets[vf->chunks - 1].duration = vf->duration -
+                                               vf->offsets[vf->chunks - 1].time;
+    ret = 0;
+fail:
+    avio_seek(f, pos + size, SEEK_SET);
+    return ret;
+}
+
+static int read_mfra(struct VideoFiles *files, int start_index,
+                     const char *file, int split)
+{
+    int err = 0;
+    AVIOContext *f = NULL;
+    int32_t mfra_size;
+
+    if ((err = avio_open2(&f, file, AVIO_FLAG_READ, NULL, NULL)) < 0)
+        goto fail;
+    avio_seek(f, avio_size(f) - 4, SEEK_SET);
+    mfra_size = avio_rb32(f);
+    avio_seek(f, -mfra_size, SEEK_CUR);
+    if (avio_rb32(f) != mfra_size)
+        goto fail;
+    if (avio_rb32(f) != MKBETAG('m', 'f', 'r', 'a'))
+        goto fail;
+    while (!read_tfra(files, start_index, f)) {
+        /* Empty */
+    }
+
+    if (split)
+        write_fragments(files, start_index, f);
+
+fail:
+    if (f)
+        avio_close(f);
+    return err;
+}
+
+static int get_private_data(struct VideoFile *vf, AVCodecContext *codec)
+{
+    vf->codec_private_size = codec->extradata_size;
+    vf->codec_private = av_mallocz(codec->extradata_size);
+    if (!vf->codec_private)
+        return AVERROR(ENOMEM);
+    memcpy(vf->codec_private, codec->extradata, codec->extradata_size);
+    return 0;
+}
+
+static int get_video_private_data(struct VideoFile *vf, AVCodecContext *codec)
+{
+    AVIOContext *io = NULL;
+    uint16_t sps_size, pps_size;
+    int err = AVERROR(EINVAL);
+
+    if (codec->codec_id == CODEC_ID_VC1)
+        return get_private_data(vf, codec);
+
+    avio_open_dyn_buf(&io);
+    if (codec->extradata_size < 11 || codec->extradata[0] != 1)
+        goto fail;
+    sps_size = AV_RB16(&codec->extradata[6]);
+    if (11 + sps_size > codec->extradata_size)
+        goto fail;
+    avio_wb32(io, 0x00000001);
+    avio_write(io, &codec->extradata[8], sps_size);
+    pps_size = AV_RB16(&codec->extradata[9 + sps_size]);
+    if (11 + sps_size + pps_size > codec->extradata_size)
+        goto fail;
+    avio_wb32(io, 0x00000001);
+    avio_write(io, &codec->extradata[11 + sps_size], pps_size);
+    err = 0;
+fail:
+    vf->codec_private_size = avio_close_dyn_buf(io, &vf->codec_private);
+    return err;
+}
+
+static int handle_file(struct VideoFiles *files, const char *file, int split)
+{
+    AVFormatContext *ctx = NULL;
+    int err = 0, i, orig_files = files->nb_files;
+    char errbuf[50], *ptr;
+    struct VideoFile *vf;
+
+    err = avformat_open_input(&ctx, file, NULL, NULL);
+    if (err < 0) {
+        av_strerror(err, errbuf, sizeof(errbuf));
+        fprintf(stderr, "Unable to open %s: %s\n", file, errbuf);
+        return 1;
+    }
+
+    err = avformat_find_stream_info(ctx, NULL);
+    if (err < 0) {
+        av_strerror(err, errbuf, sizeof(errbuf));
+        fprintf(stderr, "Unable to identify %s: %s\n", file, errbuf);
+        goto fail;
+    }
+
+    if (ctx->nb_streams < 1) {
+        fprintf(stderr, "No streams found in %s\n", file);
+        goto fail;
+    }
+    if (!files->duration)
+        files->duration = ctx->duration;
+
+    for (i = 0; i < ctx->nb_streams; i++) {
+        AVStream *st = ctx->streams[i];
+        vf = av_mallocz(sizeof(*vf));
+        files->files = av_realloc(files->files,
+                                  sizeof(*files->files)*(files->nb_files + 1));
+        files->files[files->nb_files] = vf;
+
+        vf->name = file;
+        if ((ptr = strrchr(file, '/')) != NULL)
+            vf->name = ptr + 1;
+
+        vf->bitrate = st->codec->bit_rate;
+        vf->track_id = st->id;
+        vf->timescale = st->time_base.den;
+        vf->duration = av_rescale_rnd(ctx->duration, vf->timescale,
+                                      AV_TIME_BASE, AV_ROUND_UP);
+        vf->is_audio = st->codec->codec_type == AVMEDIA_TYPE_AUDIO;
+        vf->is_video = st->codec->codec_type == AVMEDIA_TYPE_VIDEO;
+
+        if (!vf->is_audio && !vf->is_video) {
+            fprintf(stderr, "Track %d in %s is neither video nor audio, "
+                            "skipping\n", vf->track_id, file);
+            av_freep(&files->files[files->nb_files]);
+            continue;
+        }
+
+        if (vf->is_audio) {
+            if (files->audio_file < 0)
+                files->audio_file = files->nb_files;
+            files->nb_audio_files++;
+            vf->channels = st->codec->channels;
+            vf->sample_rate = st->codec->sample_rate;
+            if (st->codec->codec_id == CODEC_ID_AAC) {
+                vf->fourcc = "AACL";
+                vf->tag = 255;
+                vf->blocksize = 4;
+            } else if (st->codec->codec_id == CODEC_ID_WMAPRO) {
+                vf->fourcc = "WMAP";
+                vf->tag = st->codec->codec_tag;
+                vf->blocksize = st->codec->block_align;
+            }
+            get_private_data(vf, st->codec);
+        }
+        if (vf->is_video) {
+            if (files->video_file < 0)
+                files->video_file = files->nb_files;
+            files->nb_video_files++;
+            vf->width = st->codec->width;
+            vf->height = st->codec->height;
+            if (st->codec->codec_id == CODEC_ID_H264)
+                vf->fourcc = "H264";
+            else if (st->codec->codec_id == CODEC_ID_VC1)
+                vf->fourcc = "WVC1";
+            get_video_private_data(vf, st->codec);
+        }
+
+        files->nb_files++;
+    }
+
+    avformat_close_input(&ctx);
+
+    read_mfra(files, orig_files, file, split);
+
+fail:
+    if (ctx)
+        avformat_close_input(&ctx);
+    return err;
+}
+
+static void output_server_manifest(struct VideoFiles *files,
+                                   const char *basename)
+{
+    char filename[1000];
+    FILE *out;
+    int i;
+
+    snprintf(filename, sizeof(filename), "%s.ism", basename);
+    out = fopen(filename, "w");
+    if (!out) {
+        perror(filename);
+        return;
+    }
+    fprintf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
+    fprintf(out, "<smil xmlns=\"http://www.w3.org/2001/SMIL20/Language\">\n");
+    fprintf(out, "\t<head>\n");
+    fprintf(out, "\t\t<meta name=\"clientManifestRelativePath\" "
+                 "content=\"%s.ismc\" />\n", basename);
+    fprintf(out, "\t</head>\n");
+    fprintf(out, "\t<body>\n");
+    fprintf(out, "\t\t<switch>\n");
+    for (i = 0; i < files->nb_files; i++) {
+        struct VideoFile *vf = files->files[i];
+        const char *type = vf->is_video ? "video" : "audio";
+        fprintf(out, "\t\t\t<%s src=\"%s\" systemBitrate=\"%d\">\n",
+                type, vf->name, vf->bitrate);
+        fprintf(out, "\t\t\t\t<param name=\"trackID\" value=\"%d\" "
+                     "valueType=\"data\" />\n", vf->track_id);
+        fprintf(out, "\t\t\t</%s>\n", type);
+    }
+    fprintf(out, "\t\t</switch>\n");
+    fprintf(out, "\t</body>\n");
+    fprintf(out, "</smil>\n");
+    fclose(out);
+}
+
+static void output_client_manifest(struct VideoFiles *files,
+                                   const char *basename, int split)
+{
+    char filename[1000];
+    FILE *out;
+    int i, j;
+
+    if (split)
+        snprintf(filename, sizeof(filename), "Manifest");
+    else
+        snprintf(filename, sizeof(filename), "%s.ismc", basename);
+    out = fopen(filename, "w");
+    if (!out) {
+        perror(filename);
+        return;
+    }
+    fprintf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
+    fprintf(out, "<SmoothStreamingMedia MajorVersion=\"2\" MinorVersion=\"0\" "
+                 "Duration=\"%"PRId64"\">\n", files->duration * 10);
+    if (files->video_file >= 0) {
+        struct VideoFile *vf = files->files[files->video_file];
+        int index = 0;
+        fprintf(out, "\t<StreamIndex Type=\"video\" QualityLevels=\"%d\" "
+                     "Chunks=\"%d\" "
+                     "Url=\"QualityLevels({bitrate})/Fragments(video={start time})\">\n",
+                     files->nb_video_files, vf->chunks);
+        for (i = 0; i < files->nb_files; i++) {
+            vf = files->files[i];
+            if (!vf->is_video)
+                continue;
+            fprintf(out, "\t\t<QualityLevel Index=\"%d\" Bitrate=\"%d\" "
+                         "FourCC=\"%s\" MaxWidth=\"%d\" MaxHeight=\"%d\" "
+                         "CodecPrivateData=\"",
+                         index, vf->bitrate, vf->fourcc, vf->width, vf->height);
+            for (j = 0; j < vf->codec_private_size; j++)
+                fprintf(out, "%02X", vf->codec_private[j]);
+            fprintf(out, "\" />\n");
+            index++;
+        }
+        vf = files->files[files->video_file];
+        for (i = 0; i < vf->chunks; i++)
+            fprintf(out, "\t\t<c n=\"%d\" d=\"%d\" />\n", i,
+                    vf->offsets[i].duration);
+        fprintf(out, "\t</StreamIndex>\n");
+    }
+    if (files->audio_file >= 0) {
+        struct VideoFile *vf = files->files[files->audio_file];
+        int index = 0;
+        fprintf(out, "\t<StreamIndex Type=\"audio\" QualityLevels=\"%d\" "
+                     "Chunks=\"%d\" "
+                     "Url=\"QualityLevels({bitrate})/Fragments(audio={start time})\">\n",
+                     files->nb_audio_files, vf->chunks);
+        for (i = 0; i < files->nb_files; i++) {
+            vf = files->files[i];
+            if (!vf->is_audio)
+                continue;
+            fprintf(out, "\t\t<QualityLevel Index=\"%d\" Bitrate=\"%d\" "
+                         "FourCC=\"%s\" SamplingRate=\"%d\" Channels=\"%d\" "
+                         "BitsPerSample=\"16\" PacketSize=\"%d\" "
+                         "AudioTag=\"%d\" CodecPrivateData=\"",
+                         index, vf->bitrate, vf->fourcc, vf->sample_rate,
+                         vf->channels, vf->blocksize, vf->tag);
+            for (j = 0; j < vf->codec_private_size; j++)
+                fprintf(out, "%02X", vf->codec_private[j]);
+            fprintf(out, "\" />\n");
+            index++;
+        }
+        vf = files->files[files->audio_file];
+        for (i = 0; i < vf->chunks; i++)
+            fprintf(out, "\t\t<c n=\"%d\" d=\"%d\" />\n",
+                    i, vf->offsets[i].duration);
+        fprintf(out, "\t</StreamIndex>\n");
+    }
+    fprintf(out, "</SmoothStreamingMedia>\n");
+    fclose(out);
+}
+
+static void clean_files(struct VideoFiles *files)
+{
+    int i;
+    for (i = 0; i < files->nb_files; i++) {
+        av_freep(&files->files[i]->codec_private);
+        av_freep(&files->files[i]->offsets);
+        av_freep(&files->files[i]);
+    }
+    av_freep(&files->files);
+    files->nb_files = 0;
+}
+
+int main(int argc, char **argv)
+{
+    const char *basename = NULL;
+    int split = 0, i;
+    struct VideoFiles vf = { 0, .video_file = -1, .audio_file = -1 };
+
+    av_register_all();
+
+    for (i = 1; i < argc; i++) {
+        if (!strcmp(argv[i], "-n")) {
+            basename = argv[i + 1];
+            i++;
+        } else if (!strcmp(argv[i], "-split")) {
+            split = 1;
+        } else if (argv[i][0] == '-') {
+            return usage(argv[0], 1);
+        } else {
+            handle_file(&vf, argv[i], split);
+        }
+    }
+    if (!vf.nb_files || (!basename && !split))
+        return usage(argv[0], 1);
+
+    if (!split)
+        output_server_manifest(&vf, basename);
+    output_client_manifest(&vf, basename, split);
+
+    clean_files(&vf);
+
+    return 0;
+}
-- 
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