mirror of https://github.com/FFmpeg/FFmpeg.git
HDS fragments basically are FLV fragments wrapped in an ISO media mdat atom. Signed-off-by: Martin Storsjö <martin@martin.st>pull/45/head
Martin Storsjö
12 years ago
parent
dc6ea00cd2
commit
435214a757
6 changed files with 595 additions and 2 deletions
@ -0,0 +1,589 @@ |
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/*
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* Live HDS fragmenter |
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* Copyright (c) 2013 Martin Storsjo |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "config.h" |
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#include <float.h> |
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#if HAVE_UNISTD_H |
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#include <unistd.h> |
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#endif |
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#include "avformat.h" |
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#include "internal.h" |
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#include "os_support.h" |
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#include "libavutil/avstring.h" |
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#include "libavutil/base64.h" |
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#include "libavutil/intreadwrite.h" |
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#include "libavutil/mathematics.h" |
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#include "libavutil/opt.h" |
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typedef struct Fragment { |
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char file[1024]; |
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int64_t start_time, duration; |
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int n; |
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} Fragment; |
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typedef struct OutputStream { |
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int bitrate; |
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int first_stream; |
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AVFormatContext *ctx; |
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int ctx_inited; |
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uint8_t iobuf[32768]; |
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char temp_filename[1024]; |
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int64_t frag_start_ts, last_ts; |
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AVIOContext *out; |
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int packets_written; |
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int nb_fragments, fragments_size, fragment_index; |
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Fragment **fragments; |
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int has_audio, has_video; |
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uint8_t *metadata; |
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int metadata_size; |
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uint8_t *extra_packets[2]; |
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int extra_packet_sizes[2]; |
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int nb_extra_packets; |
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} OutputStream; |
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typedef struct HDSContext { |
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const AVClass *class; /* Class for private options. */ |
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int window_size; |
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int extra_window_size; |
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int min_frag_duration; |
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int remove_at_exit; |
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OutputStream *streams; |
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int nb_streams; |
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} HDSContext; |
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static int parse_header(OutputStream *os, const uint8_t *buf, int buf_size) |
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{ |
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if (buf_size < 13) |
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return AVERROR_INVALIDDATA; |
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if (memcmp(buf, "FLV", 3)) |
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return AVERROR_INVALIDDATA; |
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buf += 13; |
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buf_size -= 13; |
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while (buf_size >= 11 + 4) { |
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int type = buf[0]; |
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int size = AV_RB24(&buf[1]) + 11 + 4; |
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if (size > buf_size) |
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return AVERROR_INVALIDDATA; |
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if (type == 8 || type == 9) { |
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if (os->nb_extra_packets > FF_ARRAY_ELEMS(os->extra_packets)) |
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return AVERROR_INVALIDDATA; |
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os->extra_packet_sizes[os->nb_extra_packets] = size; |
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os->extra_packets[os->nb_extra_packets] = av_malloc(size); |
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if (!os->extra_packets[os->nb_extra_packets]) |
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return AVERROR(ENOMEM); |
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memcpy(os->extra_packets[os->nb_extra_packets], buf, size); |
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os->nb_extra_packets++; |
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} else if (type == 0x12) { |
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if (os->metadata) |
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return AVERROR_INVALIDDATA; |
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os->metadata_size = size - 11 - 4; |
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os->metadata = av_malloc(os->metadata_size); |
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if (!os->metadata) |
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return AVERROR(ENOMEM); |
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memcpy(os->metadata, buf + 11, os->metadata_size); |
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} |
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buf += size; |
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buf_size -= size; |
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} |
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if (!os->metadata) |
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return AVERROR_INVALIDDATA; |
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return 0; |
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} |
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static int hds_write(void *opaque, uint8_t *buf, int buf_size) |
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{ |
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OutputStream *os = opaque; |
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if (os->out) { |
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avio_write(os->out, buf, buf_size); |
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} else { |
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if (!os->metadata_size) { |
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int ret; |
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// Assuming the IO buffer is large enough to fit the
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// FLV header and all metadata and extradata packets
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if ((ret = parse_header(os, buf, buf_size)) < 0) |
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return ret; |
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} |
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} |
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return buf_size; |
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} |
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static void hds_free(AVFormatContext *s) |
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{ |
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HDSContext *c = s->priv_data; |
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int i, j; |
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if (!c->streams) |
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return; |
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for (i = 0; i < s->nb_streams; i++) { |
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OutputStream *os = &c->streams[i]; |
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if (os->out) |
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avio_close(os->out); |
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os->out = NULL; |
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if (os->ctx && os->ctx_inited) |
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av_write_trailer(os->ctx); |
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if (os->ctx && os->ctx->pb) |
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av_free(os->ctx->pb); |
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if (os->ctx) |
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avformat_free_context(os->ctx); |
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av_free(os->metadata); |
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for (j = 0; j < os->nb_extra_packets; j++) |
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av_free(os->extra_packets[j]); |
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for (j = 0; j < os->nb_fragments; j++) |
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av_free(os->fragments[j]); |
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av_free(os->fragments); |
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} |
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av_freep(&c->streams); |
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} |
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static int write_manifest(AVFormatContext *s, int final) |
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{ |
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HDSContext *c = s->priv_data; |
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AVIOContext *out; |
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char filename[1024], temp_filename[1024]; |
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int ret, i; |
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float duration = 0; |
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if (c->nb_streams > 0) |
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duration = c->streams[0].last_ts * av_q2d(s->streams[0]->time_base); |
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snprintf(filename, sizeof(filename), "%s/index.f4m", s->filename); |
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snprintf(temp_filename, sizeof(temp_filename), "%s/index.f4m.tmp", s->filename); |
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ret = avio_open2(&out, temp_filename, AVIO_FLAG_WRITE, |
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&s->interrupt_callback, NULL); |
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if (ret < 0) { |
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av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", filename); |
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return ret; |
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} |
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avio_printf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"); |
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avio_printf(out, "<manifest xmlns=\"http://ns.adobe.com/f4m/1.0\">\n"); |
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avio_printf(out, "\t<id>%s</id>\n", av_basename(s->filename)); |
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avio_printf(out, "\t<streamType>%s</streamType>\n", |
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final ? "recorded" : "live"); |
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avio_printf(out, "\t<deliveryType>streaming</deliveryType>\n"); |
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if (final) |
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avio_printf(out, "\t<duration>%f</duration>\n", duration); |
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for (i = 0; i < c->nb_streams; i++) { |
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OutputStream *os = &c->streams[i]; |
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int b64_size = AV_BASE64_SIZE(os->metadata_size); |
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char *base64 = av_malloc(b64_size); |
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if (!base64) { |
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avio_close(out); |
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return AVERROR(ENOMEM); |
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} |
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av_base64_encode(base64, b64_size, os->metadata, os->metadata_size); |
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avio_printf(out, "\t<bootstrapInfo profile=\"named\" url=\"stream%d.abst\" id=\"bootstrap%d\" />\n", i, i); |
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avio_printf(out, "\t<media bitrate=\"%d\" url=\"stream%d\" bootstrapInfoId=\"bootstrap%d\">\n", os->bitrate/1000, i, i); |
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avio_printf(out, "\t\t<metadata>%s</metadata>\n", base64); |
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avio_printf(out, "\t</media>\n"); |
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av_free(base64); |
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} |
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avio_printf(out, "</manifest>\n"); |
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avio_flush(out); |
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avio_close(out); |
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rename(temp_filename, filename); |
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return 0; |
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} |
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static void update_size(AVIOContext *out, int64_t pos) |
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{ |
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int64_t end = avio_tell(out); |
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avio_seek(out, pos, SEEK_SET); |
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avio_wb32(out, end - pos); |
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avio_seek(out, end, SEEK_SET); |
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} |
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/* Note, the .abst files need to be served with the "binary/octet"
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* mime type, otherwise at least the OSMF player can easily fail |
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* with "stream not found" when polling for the next fragment. */ |
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static int write_abst(AVFormatContext *s, OutputStream *os, int final) |
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{ |
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HDSContext *c = s->priv_data; |
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AVIOContext *out; |
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char filename[1024], temp_filename[1024]; |
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int i, ret; |
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int64_t asrt_pos, afrt_pos; |
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int start = 0, fragments; |
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int index = s->streams[os->first_stream]->id; |
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int64_t cur_media_time = 0; |
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if (c->window_size) |
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start = FFMAX(os->nb_fragments - c->window_size, 0); |
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fragments = os->nb_fragments - start; |
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if (final) |
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cur_media_time = os->last_ts; |
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else if (os->nb_fragments) |
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cur_media_time = os->fragments[os->nb_fragments - 1]->start_time; |
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snprintf(filename, sizeof(filename), |
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"%s/stream%d.abst", s->filename, index); |
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snprintf(temp_filename, sizeof(temp_filename), |
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"%s/stream%d.abst.tmp", s->filename, index); |
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ret = avio_open2(&out, temp_filename, AVIO_FLAG_WRITE, |
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&s->interrupt_callback, NULL); |
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if (ret < 0) { |
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av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", temp_filename); |
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return ret; |
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} |
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avio_wb32(out, 0); // abst size
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avio_wl32(out, MKTAG('a','b','s','t')); |
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avio_wb32(out, 0); // version + flags
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avio_wb32(out, os->fragment_index - 1); // BootstrapinfoVersion
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avio_w8(out, final ? 0 : 0x20); // profile, live, update
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avio_wb32(out, 1000); // timescale
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avio_wb64(out, cur_media_time); |
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avio_wb64(out, 0); // SmpteTimeCodeOffset
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avio_w8(out, 0); // MovieIdentifer (null string)
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avio_w8(out, 0); // ServerEntryCount
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avio_w8(out, 0); // QualityEntryCount
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avio_w8(out, 0); // DrmData (null string)
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avio_w8(out, 0); // MetaData (null string)
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avio_w8(out, 1); // SegmentRunTableCount
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asrt_pos = avio_tell(out); |
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avio_wb32(out, 0); // asrt size
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avio_wl32(out, MKTAG('a','s','r','t')); |
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avio_wb32(out, 0); // version + flags
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avio_w8(out, 0); // QualityEntryCount
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avio_wb32(out, 1); // SegmentRunEntryCount
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avio_wb32(out, 1); // FirstSegment
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avio_wb32(out, final ? (os->fragment_index - 1) : 0xffffffff); // FragmentsPerSegment
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update_size(out, asrt_pos); |
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avio_w8(out, 1); // FragmentRunTableCount
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afrt_pos = avio_tell(out); |
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avio_wb32(out, 0); // afrt size
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avio_wl32(out, MKTAG('a','f','r','t')); |
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avio_wb32(out, 0); // version + flags
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avio_wb32(out, 1000); // timescale
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avio_w8(out, 0); // QualityEntryCount
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avio_wb32(out, fragments); // FragmentRunEntryCount
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for (i = start; i < os->nb_fragments; i++) { |
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avio_wb32(out, os->fragments[i]->n); |
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avio_wb64(out, os->fragments[i]->start_time); |
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avio_wb32(out, os->fragments[i]->duration); |
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} |
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update_size(out, afrt_pos); |
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update_size(out, 0); |
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avio_close(out); |
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rename(temp_filename, filename); |
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return 0; |
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} |
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static int init_file(AVFormatContext *s, OutputStream *os, int64_t start_ts) |
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{ |
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int ret, i; |
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ret = avio_open2(&os->out, os->temp_filename, AVIO_FLAG_WRITE, |
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&s->interrupt_callback, NULL); |
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if (ret < 0) |
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return ret; |
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avio_wb32(os->out, 0); |
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avio_wl32(os->out, MKTAG('m','d','a','t')); |
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for (i = 0; i < os->nb_extra_packets; i++) { |
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AV_WB24(os->extra_packets[i] + 4, start_ts); |
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os->extra_packets[i][7] = (start_ts >> 24) & 0x7f; |
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avio_write(os->out, os->extra_packets[i], os->extra_packet_sizes[i]); |
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} |
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return 0; |
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} |
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static void close_file(OutputStream *os) |
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{ |
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int64_t pos = avio_tell(os->out); |
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avio_seek(os->out, 0, SEEK_SET); |
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avio_wb32(os->out, pos); |
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avio_flush(os->out); |
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avio_close(os->out); |
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os->out = NULL; |
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} |
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static int hds_write_header(AVFormatContext *s) |
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{ |
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HDSContext *c = s->priv_data; |
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int ret = 0, i; |
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AVOutputFormat *oformat; |
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mkdir(s->filename, 0777); |
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oformat = av_guess_format("flv", NULL, NULL); |
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if (!oformat) { |
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ret = AVERROR_MUXER_NOT_FOUND; |
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goto fail; |
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} |
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c->streams = av_mallocz(sizeof(*c->streams) * s->nb_streams); |
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if (!c->streams) { |
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ret = AVERROR(ENOMEM); |
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goto fail; |
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} |
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for (i = 0; i < s->nb_streams; i++) { |
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OutputStream *os = &c->streams[c->nb_streams]; |
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AVFormatContext *ctx; |
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AVStream *st = s->streams[i]; |
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if (!st->codec->bit_rate) { |
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av_log(s, AV_LOG_ERROR, "No bit rate set for stream %d\n", i); |
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ret = AVERROR(EINVAL); |
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goto fail; |
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} |
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if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) { |
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if (os->has_video) { |
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c->nb_streams++; |
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os++; |
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} |
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os->has_video = 1; |
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} else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) { |
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if (os->has_audio) { |
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c->nb_streams++; |
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os++; |
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} |
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os->has_audio = 1; |
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} else { |
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av_log(s, AV_LOG_ERROR, "Unsupported stream type in stream %d\n", i); |
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ret = AVERROR(EINVAL); |
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goto fail; |
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} |
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os->bitrate += s->streams[i]->codec->bit_rate; |
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if (!os->ctx) { |
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os->first_stream = i; |
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ctx = avformat_alloc_context(); |
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if (!ctx) { |
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ret = AVERROR(ENOMEM); |
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goto fail; |
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} |
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os->ctx = ctx; |
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ctx->oformat = oformat; |
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ctx->interrupt_callback = s->interrupt_callback; |
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ctx->pb = avio_alloc_context(os->iobuf, sizeof(os->iobuf), |
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AVIO_FLAG_WRITE, os, |
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NULL, hds_write, NULL); |
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if (!ctx->pb) { |
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ret = AVERROR(ENOMEM); |
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goto fail; |
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} |
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} else { |
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ctx = os->ctx; |
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} |
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s->streams[i]->id = c->nb_streams; |
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if (!(st = avformat_new_stream(ctx, NULL))) { |
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ret = AVERROR(ENOMEM); |
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goto fail; |
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} |
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avcodec_copy_context(st->codec, s->streams[i]->codec); |
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st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio; |
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} |
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if (c->streams[c->nb_streams].ctx) |
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c->nb_streams++; |
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for (i = 0; i < c->nb_streams; i++) { |
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OutputStream *os = &c->streams[i]; |
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int j; |
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if ((ret = avformat_write_header(os->ctx, NULL)) < 0) { |
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goto fail; |
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} |
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os->ctx_inited = 1; |
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avio_flush(os->ctx->pb); |
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for (j = 0; j < os->ctx->nb_streams; j++) |
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s->streams[os->first_stream + j]->time_base = os->ctx->streams[j]->time_base; |
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snprintf(os->temp_filename, sizeof(os->temp_filename), |
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"%s/stream%d_temp", s->filename, i); |
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init_file(s, os, 0); |
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if (!os->has_video && c->min_frag_duration <= 0) { |
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av_log(s, AV_LOG_WARNING, |
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"No video stream in output stream %d and no min frag duration set\n", i); |
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ret = AVERROR(EINVAL); |
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} |
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os->fragment_index = 1; |
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write_abst(s, os, 0); |
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} |
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ret = write_manifest(s, 0); |
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fail: |
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if (ret) |
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hds_free(s); |
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return ret; |
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} |
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|
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static int add_fragment(OutputStream *os, const char *file, |
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int64_t start_time, int64_t duration) |
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{ |
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Fragment *frag; |
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if (duration == 0) |
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duration = 1; |
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if (os->nb_fragments >= os->fragments_size) { |
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int ret; |
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os->fragments_size = (os->fragments_size + 1) * 2; |
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if ((ret = av_reallocp_array(&os->fragments, os->fragments_size, |
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sizeof(*os->fragments))) < 0) { |
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os->fragments_size = 0; |
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os->nb_fragments = 0; |
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return ret; |
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} |
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} |
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frag = av_mallocz(sizeof(*frag)); |
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if (!frag) |
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return AVERROR(ENOMEM); |
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av_strlcpy(frag->file, file, sizeof(frag->file)); |
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frag->start_time = start_time; |
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frag->duration = duration; |
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frag->n = os->fragment_index; |
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os->fragments[os->nb_fragments++] = frag; |
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os->fragment_index++; |
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return 0; |
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} |
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|
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static int hds_flush(AVFormatContext *s, OutputStream *os, int final, |
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int64_t end_ts) |
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{ |
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HDSContext *c = s->priv_data; |
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int i, ret = 0; |
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char target_filename[1024]; |
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int index = s->streams[os->first_stream]->id; |
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|
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if (!os->packets_written) |
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return 0; |
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|
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avio_flush(os->ctx->pb); |
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os->packets_written = 0; |
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close_file(os); |
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|
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snprintf(target_filename, sizeof(target_filename), |
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"%s/stream%dSeg1-Frag%d", s->filename, index, os->fragment_index); |
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rename(os->temp_filename, target_filename); |
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add_fragment(os, target_filename, os->frag_start_ts, end_ts - os->frag_start_ts); |
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|
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if (!final) { |
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ret = init_file(s, os, end_ts); |
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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) * 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); |
||||
} |
||||
|
||||
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, |
||||
}; |
||||
Loading…
Reference in new issue