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ffmpeg/libavformat/hdsenc.c

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/*
* Live HDS fragmenter
* Copyright (c) 2013 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 "libavutil/avstring.h"
#include "libavutil/base64.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
typedef struct Fragment {
char file[1024];
int64_t start_time, duration;
int n;
} Fragment;
typedef struct OutputStream {
int bitrate;
int first_stream;
AVFormatContext *ctx;
int ctx_inited;
uint8_t iobuf[32768];
char temp_filename[1024];
int64_t frag_start_ts, last_ts;
AVIOContext *out;
int packets_written;
int nb_fragments, fragments_size, fragment_index;
Fragment **fragments;
int has_audio, has_video;
uint8_t *metadata;
int metadata_size;
uint8_t *extra_packets[2];
int extra_packet_sizes[2];
int nb_extra_packets;
} OutputStream;
typedef struct HDSContext {
const AVClass *class; /* Class for private options. */
int window_size;
int extra_window_size;
int min_frag_duration;
int remove_at_exit;
OutputStream *streams;
int nb_streams;
} HDSContext;
static int parse_header(OutputStream *os, const uint8_t *buf, int buf_size)
{
if (buf_size < 13)
return AVERROR_INVALIDDATA;
if (memcmp(buf, "FLV", 3))
return AVERROR_INVALIDDATA;
buf += 13;
buf_size -= 13;
while (buf_size >= 11 + 4) {
int type = buf[0];
int size = AV_RB24(&buf[1]) + 11 + 4;
if (size > buf_size)
return AVERROR_INVALIDDATA;
if (type == 8 || type == 9) {
if (os->nb_extra_packets >= FF_ARRAY_ELEMS(os->extra_packets))
return AVERROR_INVALIDDATA;
os->extra_packet_sizes[os->nb_extra_packets] = size;
os->extra_packets[os->nb_extra_packets] = av_malloc(size);
if (!os->extra_packets[os->nb_extra_packets])
return AVERROR(ENOMEM);
memcpy(os->extra_packets[os->nb_extra_packets], buf, size);
os->nb_extra_packets++;
} else if (type == 0x12) {
if (os->metadata)
return AVERROR_INVALIDDATA;
os->metadata_size = size - 11 - 4;
os->metadata = av_malloc(os->metadata_size);
if (!os->metadata)
return AVERROR(ENOMEM);
memcpy(os->metadata, buf + 11, os->metadata_size);
}
buf += size;
buf_size -= size;
}
if (!os->metadata)
return AVERROR_INVALIDDATA;
return 0;
}
static int hds_write(void *opaque, uint8_t *buf, int buf_size)
{
OutputStream *os = opaque;
if (os->out) {
avio_write(os->out, buf, buf_size);
} else {
if (!os->metadata_size) {
int ret;
// Assuming the IO buffer is large enough to fit the
// FLV header and all metadata and extradata packets
if ((ret = parse_header(os, buf, buf_size)) < 0)
return ret;
}
}
return buf_size;
}
static void hds_free(AVFormatContext *s)
{
HDSContext *c = s->priv_data;
int i, j;
if (!c->streams)
return;
for (i = 0; i < s->nb_streams; i++) {
OutputStream *os = &c->streams[i];
if (os->out)
avio_close(os->out);
os->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->metadata);
for (j = 0; j < os->nb_extra_packets; j++)
av_free(os->extra_packets[j]);
for (j = 0; j < os->nb_fragments; j++)
av_free(os->fragments[j]);
av_free(os->fragments);
}
av_freep(&c->streams);
}
static int write_manifest(AVFormatContext *s, int final)
{
HDSContext *c = s->priv_data;
AVIOContext *out;
char filename[1024], temp_filename[1024];
int ret, i;
float duration = 0;
if (c->nb_streams > 0)
duration = c->streams[0].last_ts * av_q2d(s->streams[0]->time_base);
snprintf(filename, sizeof(filename), "%s/index.f4m", s->filename);
snprintf(temp_filename, sizeof(temp_filename), "%s/index.f4m.tmp", s->filename);
ret = avio_open2(&out, temp_filename, AVIO_FLAG_WRITE,
&s->interrupt_callback, NULL);
if (ret < 0) {
av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", filename);
return ret;
}
avio_printf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
avio_printf(out, "<manifest xmlns=\"http://ns.adobe.com/f4m/1.0\">\n");
avio_printf(out, "\t<id>%s</id>\n", av_basename(s->filename));
avio_printf(out, "\t<streamType>%s</streamType>\n",
final ? "recorded" : "live");
avio_printf(out, "\t<deliveryType>streaming</deliveryType>\n");
if (final)
avio_printf(out, "\t<duration>%f</duration>\n", duration);
for (i = 0; i < c->nb_streams; i++) {
OutputStream *os = &c->streams[i];
int b64_size = AV_BASE64_SIZE(os->metadata_size);
char *base64 = av_malloc(b64_size);
if (!base64) {
avio_close(out);
return AVERROR(ENOMEM);
}
av_base64_encode(base64, b64_size, os->metadata, os->metadata_size);
avio_printf(out, "\t<bootstrapInfo profile=\"named\" url=\"stream%d.abst\" id=\"bootstrap%d\" />\n", i, i);
avio_printf(out, "\t<media bitrate=\"%d\" url=\"stream%d\" bootstrapInfoId=\"bootstrap%d\">\n", os->bitrate/1000, i, i);
avio_printf(out, "\t\t<metadata>%s</metadata>\n", base64);
avio_printf(out, "\t</media>\n");
av_free(base64);
}
avio_printf(out, "</manifest>\n");
avio_flush(out);
avio_close(out);
if (rename(temp_filename, filename) == -1) {
av_log(s, AV_LOG_ERROR, "failed to rename file %s to %s\n", temp_filename, filename);
return AVERROR(errno);
}
return 0;
}
static void update_size(AVIOContext *out, int64_t pos)
{
int64_t end = avio_tell(out);
avio_seek(out, pos, SEEK_SET);
avio_wb32(out, end - pos);
avio_seek(out, end, SEEK_SET);
}
/* Note, the .abst files need to be served with the "binary/octet"
* mime type, otherwise at least the OSMF player can easily fail
* with "stream not found" when polling for the next fragment. */
static int write_abst(AVFormatContext *s, OutputStream *os, int final)
{
HDSContext *c = s->priv_data;
AVIOContext *out;
char filename[1024], temp_filename[1024];
int i, ret;
int64_t asrt_pos, afrt_pos;
int start = 0, fragments;
int index = s->streams[os->first_stream]->id;
int64_t cur_media_time = 0;
if (c->window_size)
start = FFMAX(os->nb_fragments - c->window_size, 0);
fragments = os->nb_fragments - start;
if (final)
cur_media_time = os->last_ts;
else if (os->nb_fragments)
cur_media_time = os->fragments[os->nb_fragments - 1]->start_time;
snprintf(filename, sizeof(filename),
"%s/stream%d.abst", s->filename, index);
snprintf(temp_filename, sizeof(temp_filename),
"%s/stream%d.abst.tmp", s->filename, index);
ret = avio_open2(&out, temp_filename, AVIO_FLAG_WRITE,
&s->interrupt_callback, NULL);
if (ret < 0) {
av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", temp_filename);
return ret;
}
avio_wb32(out, 0); // abst size
avio_wl32(out, MKTAG('a','b','s','t'));
avio_wb32(out, 0); // version + flags
avio_wb32(out, os->fragment_index - 1); // BootstrapinfoVersion
avio_w8(out, final ? 0 : 0x20); // profile, live, update
avio_wb32(out, 1000); // timescale
avio_wb64(out, cur_media_time);
avio_wb64(out, 0); // SmpteTimeCodeOffset
avio_w8(out, 0); // MovieIdentifer (null string)
avio_w8(out, 0); // ServerEntryCount
avio_w8(out, 0); // QualityEntryCount
avio_w8(out, 0); // DrmData (null string)
avio_w8(out, 0); // MetaData (null string)
avio_w8(out, 1); // SegmentRunTableCount
asrt_pos = avio_tell(out);
avio_wb32(out, 0); // asrt size
avio_wl32(out, MKTAG('a','s','r','t'));
avio_wb32(out, 0); // version + flags
avio_w8(out, 0); // QualityEntryCount
avio_wb32(out, 1); // SegmentRunEntryCount
avio_wb32(out, 1); // FirstSegment
avio_wb32(out, final ? (os->fragment_index - 1) : 0xffffffff); // FragmentsPerSegment
update_size(out, asrt_pos);
avio_w8(out, 1); // FragmentRunTableCount
afrt_pos = avio_tell(out);
avio_wb32(out, 0); // afrt size
avio_wl32(out, MKTAG('a','f','r','t'));
avio_wb32(out, 0); // version + flags
avio_wb32(out, 1000); // timescale
avio_w8(out, 0); // QualityEntryCount
avio_wb32(out, fragments); // FragmentRunEntryCount
for (i = start; i < os->nb_fragments; i++) {
avio_wb32(out, os->fragments[i]->n);
avio_wb64(out, os->fragments[i]->start_time);
avio_wb32(out, os->fragments[i]->duration);
}
update_size(out, afrt_pos);
update_size(out, 0);
avio_close(out);
if (rename(temp_filename, filename) == -1) {
av_log(s, AV_LOG_ERROR, "failed to rename file %s to %s\n", temp_filename, filename);
return AVERROR(errno);
}
return 0;
}
static int init_file(AVFormatContext *s, OutputStream *os, int64_t start_ts)
{
int ret, i;
ret = avio_open2(&os->out, os->temp_filename, AVIO_FLAG_WRITE,
&s->interrupt_callback, NULL);
if (ret < 0)
return ret;
avio_wb32(os->out, 0);
avio_wl32(os->out, MKTAG('m','d','a','t'));
for (i = 0; i < os->nb_extra_packets; i++) {
AV_WB24(os->extra_packets[i] + 4, start_ts);
os->extra_packets[i][7] = (start_ts >> 24) & 0x7f;
avio_write(os->out, os->extra_packets[i], os->extra_packet_sizes[i]);
}
return 0;
}
static void close_file(OutputStream *os)
{
int64_t pos = avio_tell(os->out);
avio_seek(os->out, 0, SEEK_SET);
avio_wb32(os->out, pos);
avio_flush(os->out);
avio_close(os->out);
os->out = NULL;
}
static int hds_write_header(AVFormatContext *s)
{
HDSContext *c = s->priv_data;
int ret = 0, i;
AVOutputFormat *oformat;
if (mkdir(s->filename, 0777)) {
int is_error = errno != EEXIST;
av_log(s, is_error ? AV_LOG_ERROR : AV_LOG_VERBOSE, "Failed to create directory %s\n", s->filename);
if (is_error) {
ret = AVERROR(errno);
goto fail;
}
}
oformat = av_guess_format("flv", NULL, NULL);
if (!oformat) {
ret = AVERROR_MUXER_NOT_FOUND;
goto fail;
}
c->streams = av_mallocz_array(s->nb_streams, sizeof(*c->streams));
if (!c->streams) {
ret = AVERROR(ENOMEM);
goto fail;
}
for (i = 0; i < s->nb_streams; i++) {
OutputStream *os = &c->streams[c->nb_streams];
AVFormatContext *ctx;
AVStream *st = s->streams[i];
if (!st->codec->bit_rate) {
av_log(s, AV_LOG_ERROR, "No bit rate set for stream %d\n", i);
ret = AVERROR(EINVAL);
goto fail;
}
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
if (os->has_video) {
c->nb_streams++;
os++;
}
os->has_video = 1;
} else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
if (os->has_audio) {
c->nb_streams++;
os++;
}
os->has_audio = 1;
} else {
av_log(s, AV_LOG_ERROR, "Unsupported stream type in stream %d\n", i);
ret = AVERROR(EINVAL);
goto fail;
}
os->bitrate += s->streams[i]->codec->bit_rate;
if (!os->ctx) {
os->first_stream = i;
ctx = avformat_alloc_context();
if (!ctx) {
ret = AVERROR(ENOMEM);
goto fail;
}
os->ctx = ctx;
ctx->oformat = oformat;
ctx->interrupt_callback = s->interrupt_callback;
ctx->pb = avio_alloc_context(os->iobuf, sizeof(os->iobuf),
AVIO_FLAG_WRITE, os,
NULL, hds_write, NULL);
if (!ctx->pb) {
ret = AVERROR(ENOMEM);
goto fail;
}
} else {
ctx = os->ctx;
}
s->streams[i]->id = c->nb_streams;
if (!(st = avformat_new_stream(ctx, NULL))) {
ret = AVERROR(ENOMEM);
goto fail;
}
avcodec_copy_context(st->codec, s->streams[i]->codec);
st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
}
if (c->streams[c->nb_streams].ctx)
c->nb_streams++;
for (i = 0; i < c->nb_streams; i++) {
OutputStream *os = &c->streams[i];
int j;
if ((ret = avformat_write_header(os->ctx, NULL)) < 0) {
goto fail;
}
os->ctx_inited = 1;
avio_flush(os->ctx->pb);
for (j = 0; j < os->ctx->nb_streams; j++)
s->streams[os->first_stream + j]->time_base = os->ctx->streams[j]->time_base;
snprintf(os->temp_filename, sizeof(os->temp_filename),
"%s/stream%d_temp", s->filename, i);
ret = init_file(s, os, 0);
if (ret < 0)
goto fail;
if (!os->has_video && c->min_frag_duration <= 0) {
av_log(s, AV_LOG_WARNING,
"No video stream in output stream %d and no min frag duration set\n", i);
ret = AVERROR(EINVAL);
}
os->fragment_index = 1;
write_abst(s, os, 0);
}
ret = write_manifest(s, 0);
fail:
if (ret)
hds_free(s);
return ret;
}
static int add_fragment(OutputStream *os, const char *file,
int64_t start_time, int64_t duration)
{
Fragment *frag;
if (duration == 0)
duration = 1;
if (os->nb_fragments >= os->fragments_size) {
int ret;
os->fragments_size = (os->fragments_size + 1) * 2;
if ((ret = av_reallocp_array(&os->fragments, os->fragments_size,
sizeof(*os->fragments))) < 0) {
os->fragments_size = 0;
os->nb_fragments = 0;
return ret;
}
}
frag = av_mallocz(sizeof(*frag));
if (!frag)
return AVERROR(ENOMEM);
av_strlcpy(frag->file, file, sizeof(frag->file));
frag->start_time = start_time;
frag->duration = duration;
frag->n = os->fragment_index;
os->fragments[os->nb_fragments++] = frag;
os->fragment_index++;
return 0;
}
static int hds_flush(AVFormatContext *s, OutputStream *os, int final,
int64_t end_ts)
{
HDSContext *c = s->priv_data;
int i, ret = 0;
char target_filename[1024];
int index = s->streams[os->first_stream]->id;
if (!os->packets_written)
return 0;
avio_flush(os->ctx->pb);
os->packets_written = 0;
close_file(os);
snprintf(target_filename, sizeof(target_filename),
"%s/stream%dSeg1-Frag%d", s->filename, index, os->fragment_index);
if (rename(os->temp_filename, target_filename) == -1) {
av_log(s, AV_LOG_ERROR, "failed to rename file %s to %s\n", os->temp_filename, target_filename);
return AVERROR(errno);
}
add_fragment(os, target_filename, os->frag_start_ts, end_ts - os->frag_start_ts);
if (!final) {
ret = init_file(s, os, end_ts);
if (ret < 0)
return ret;
}
if (c->window_size || (final && c->remove_at_exit)) {
int remove = os->nb_fragments - c->window_size - c->extra_window_size;
if (final && c->remove_at_exit)
remove = os->nb_fragments;
if (remove > 0) {
for (i = 0; i < remove; i++) {
unlink(os->fragments[i]->file);
av_free(os->fragments[i]);
}
os->nb_fragments -= remove;
memmove(os->fragments, os->fragments + remove,
os->nb_fragments * sizeof(*os->fragments));
}
}
if (ret >= 0)
ret = write_abst(s, os, final);
return ret;
}
static int hds_write_packet(AVFormatContext *s, AVPacket *pkt)
{
HDSContext *c = s->priv_data;
AVStream *st = s->streams[pkt->stream_index];
OutputStream *os = &c->streams[s->streams[pkt->stream_index]->id];
int64_t end_dts = os->fragment_index * (int64_t)c->min_frag_duration;
int ret;
if (st->first_dts == AV_NOPTS_VALUE)
st->first_dts = pkt->dts;
if ((!os->has_video || st->codec->codec_type == AVMEDIA_TYPE_VIDEO) &&
av_compare_ts(pkt->dts - st->first_dts, st->time_base,
end_dts, AV_TIME_BASE_Q) >= 0 &&
pkt->flags & AV_PKT_FLAG_KEY && os->packets_written) {
if ((ret = hds_flush(s, os, 0, pkt->dts)) < 0)
return ret;
}
// Note, these fragment start timestamps, that represent a whole
// OutputStream, assume all streams in it have the same time base.
if (!os->packets_written)
os->frag_start_ts = pkt->dts;
os->last_ts = pkt->dts;
os->packets_written++;
return ff_write_chained(os->ctx, pkt->stream_index - os->first_stream, pkt, s, 0);
}
static int hds_write_trailer(AVFormatContext *s)
{
HDSContext *c = s->priv_data;
int i;
for (i = 0; i < c->nb_streams; i++)
hds_flush(s, &c->streams[i], 1, c->streams[i].last_ts);
write_manifest(s, 1);
if (c->remove_at_exit) {
char filename[1024];
snprintf(filename, sizeof(filename), "%s/index.f4m", s->filename);
unlink(filename);
for (i = 0; i < c->nb_streams; i++) {
snprintf(filename, sizeof(filename), "%s/stream%d.abst", s->filename, i);
unlink(filename);
}
rmdir(s->filename);
}
hds_free(s);
return 0;
}
#define OFFSET(x) offsetof(HDSContext, x)
#define E AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "window_size", "number of fragments kept in the manifest", OFFSET(window_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, E },
{ "extra_window_size", "number of fragments kept outside of the manifest before removing from disk", OFFSET(extra_window_size), AV_OPT_TYPE_INT, { .i64 = 5 }, 0, INT_MAX, E },
{ "min_frag_duration", "minimum fragment duration (in microseconds)", OFFSET(min_frag_duration), AV_OPT_TYPE_INT64, { .i64 = 10000000 }, 0, INT_MAX, E },
{ "remove_at_exit", "remove all fragments when finished", OFFSET(remove_at_exit), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, E },
{ NULL },
};
static const AVClass hds_class = {
.class_name = "HDS muxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVOutputFormat ff_hds_muxer = {
.name = "hds",
.long_name = NULL_IF_CONFIG_SMALL("HDS Muxer"),
.priv_data_size = sizeof(HDSContext),
.audio_codec = AV_CODEC_ID_AAC,
.video_codec = AV_CODEC_ID_H264,
.flags = AVFMT_GLOBALHEADER | AVFMT_NOFILE,
.write_header = hds_write_header,
.write_packet = hds_write_packet,
.write_trailer = hds_write_trailer,
.priv_class = &hds_class,
};
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