mirror of https://github.com/FFmpeg/FFmpeg.git
Luca Barbato
12 years ago
parent
b9629acb6b
commit
22a0827dff
4 changed files with 347 additions and 1 deletions
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/*
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* Apple HTTP Live Streaming segmenter |
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* Copyright (c) 2012, Luca Barbato |
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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 <float.h> |
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#include "libavutil/mathematics.h" |
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#include "libavutil/parseutils.h" |
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#include "libavutil/avstring.h" |
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#include "libavutil/opt.h" |
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#include "libavutil/log.h" |
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#include "avformat.h" |
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#include "internal.h" |
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typedef struct ListEntry { |
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char name[1024]; |
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int duration; |
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struct ListEntry *next; |
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} ListEntry; |
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typedef struct HLSContext { |
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const AVClass *class; // Class for private options.
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int number; |
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AVOutputFormat *oformat; |
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AVFormatContext *avf; |
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float time; // Set by a private option.
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int size; // Set by a private option.
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int wrap; // Set by a private option.
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int64_t recording_time; |
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int has_video; |
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int64_t start_pts; |
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int64_t end_pts; |
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ListEntry *list; |
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ListEntry *end_list; |
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char *basename; |
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AVIOContext *pb; |
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} HLSContext; |
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static int hls_mux_init(AVFormatContext *s) |
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{ |
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HLSContext *hls = s->priv_data; |
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AVFormatContext *oc; |
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int i; |
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hls->avf = oc = avformat_alloc_context(); |
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if (!oc) |
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return AVERROR(ENOMEM); |
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oc->oformat = hls->oformat; |
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oc->interrupt_callback = s->interrupt_callback; |
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for (i = 0; i < s->nb_streams; i++) { |
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AVStream *st; |
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if (!(st = avformat_new_stream(oc, NULL))) |
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return AVERROR(ENOMEM); |
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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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return 0; |
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} |
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static int append_entry(HLSContext *hls, uint64_t duration) |
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{ |
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ListEntry *en = av_malloc(sizeof(*en)); |
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if (!en) |
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return AVERROR(ENOMEM); |
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av_get_frame_filename(en->name, sizeof(en->name), hls->basename, |
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hls->number -1); |
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en->duration = duration; |
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en->next = NULL; |
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if (!hls->list) |
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hls->list = en; |
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else |
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hls->end_list->next = en; |
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hls->end_list = en; |
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if (hls->number >= hls->size) { |
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en = hls->list; |
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hls->list = en->next; |
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av_free(en); |
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} |
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return 0; |
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} |
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static void free_entries(HLSContext *hls) |
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{ |
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ListEntry *p = hls->list, *en; |
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while(p) { |
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en = p; |
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p = p->next; |
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av_free(en); |
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} |
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} |
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static int hls_window(AVFormatContext *s, int last) |
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{ |
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HLSContext *hls = s->priv_data; |
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ListEntry *en; |
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int ret = 0; |
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if ((ret = avio_open2(&hls->pb, s->filename, AVIO_FLAG_WRITE, |
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&s->interrupt_callback, NULL)) < 0) |
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goto fail; |
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avio_printf(hls->pb, "#EXTM3U\n"); |
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avio_printf(hls->pb, "#EXT-X-VERSION:3\n"); |
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avio_printf(hls->pb, "#EXT-X-TARGETDURATION:%d\n", (int)hls->time); |
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avio_printf(hls->pb, "#EXT-X-MEDIA-SEQUENCE:%d\n", |
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FFMAX(0, hls->number - hls->size)); |
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for (en = hls->list; en; en = en->next) { |
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avio_printf(hls->pb, "#EXTINF:%d,\n", en->duration); |
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avio_printf(hls->pb, "%s\n", en->name); |
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} |
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if (last) |
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avio_printf(hls->pb, "#EXT-X-ENDLIST\n"); |
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fail: |
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avio_closep(&hls->pb); |
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return ret; |
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} |
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static int hls_start(AVFormatContext *s) |
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{ |
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HLSContext *c = s->priv_data; |
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AVFormatContext *oc = c->avf; |
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int err = 0; |
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if (c->wrap) |
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c->number %= c->wrap; |
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if (av_get_frame_filename(oc->filename, sizeof(oc->filename), |
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c->basename, c->number++) < 0) |
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return AVERROR(EINVAL); |
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if ((err = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE, |
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&s->interrupt_callback, NULL)) < 0) |
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return err; |
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if (oc->oformat->priv_class && oc->priv_data) |
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av_opt_set(oc->priv_data, "mpegts_flags", "resend_headers", 0); |
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return 0; |
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} |
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static int hls_write_header(AVFormatContext *s) |
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{ |
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HLSContext *hls = s->priv_data; |
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int ret, i; |
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char *p; |
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const char *pattern = "%d.ts"; |
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int basename_size = strlen(s->filename) + strlen(pattern); |
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hls->number = 0; |
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hls->recording_time = hls->time * 1000000; |
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hls->start_pts = AV_NOPTS_VALUE; |
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for (i = 0; i < s->nb_streams; i++) |
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hls->has_video += |
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s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO; |
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if (hls->has_video > 1) |
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av_log(s, AV_LOG_WARNING, |
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"More than a single video stream present, " |
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"expect issues decoding it.\n"); |
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hls->oformat = av_guess_format("mpegts", NULL, NULL); |
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if (!hls->oformat) { |
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ret = AVERROR_MUXER_NOT_FOUND; |
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goto fail; |
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} |
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hls->basename = av_malloc(basename_size); |
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if (!hls->basename) { |
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ret = AVERROR(ENOMEM); |
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goto fail; |
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} |
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strcpy(hls->basename, s->filename); |
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p = strrchr(hls->basename, '.'); |
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if (p) |
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*p = '\0'; |
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av_strlcat(hls->basename, "%d.ts", basename_size); |
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if ((ret = hls_mux_init(s)) < 0) |
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goto fail; |
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if ((ret = hls_start(s)) < 0) |
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goto fail; |
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if ((ret = avformat_write_header(hls->avf, NULL)) < 0) |
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return ret; |
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fail: |
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if (ret) { |
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av_free(hls->basename); |
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if (hls->avf) |
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avformat_free_context(hls->avf); |
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} |
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return ret; |
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} |
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static int hls_write_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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HLSContext *hls = s->priv_data; |
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AVFormatContext *oc = hls->avf; |
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AVStream *st = s->streams[pkt->stream_index]; |
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int64_t end_pts = hls->recording_time * hls->number; |
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int ret; |
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if (hls->start_pts == AV_NOPTS_VALUE) { |
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hls->start_pts = pkt->pts; |
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hls->end_pts = pkt->pts; |
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} |
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end_pts += hls->start_pts; |
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if ((hls->has_video && st->codec->codec_type == AVMEDIA_TYPE_VIDEO) && |
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av_compare_ts(pkt->pts, st->time_base, end_pts, AV_TIME_BASE_Q) >= 0 && |
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pkt->flags & AV_PKT_FLAG_KEY) { |
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append_entry(hls, av_rescale(pkt->pts - hls->end_pts, |
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st->time_base.num, |
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st->time_base.den)); |
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hls->end_pts = pkt->pts; |
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av_write_frame(oc, NULL); /* Flush any buffered data */ |
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avio_close(oc->pb); |
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ret = hls_start(s); |
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if (ret) |
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return ret; |
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oc = hls->avf; |
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if ((ret = hls_window(s, 0)) < 0) |
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return ret; |
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} |
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ret = ff_write_chained(oc, pkt->stream_index, pkt, s); |
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return ret; |
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} |
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static int hls_write_trailer(struct AVFormatContext *s) |
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{ |
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HLSContext *hls = s->priv_data; |
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AVFormatContext *oc = hls->avf; |
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av_write_trailer(oc); |
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avio_closep(&oc->pb); |
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avformat_free_context(oc); |
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av_free(hls->basename); |
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hls_window(s, 1); |
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free_entries(hls); |
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avio_close(hls->pb); |
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return 0; |
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} |
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#define OFFSET(x) offsetof(HLSContext, x) |
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#define E AV_OPT_FLAG_ENCODING_PARAM |
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static const AVOption options[] = { |
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{"hls_time", "segment length in seconds", OFFSET(time), AV_OPT_TYPE_FLOAT, {.dbl = 2}, 0, FLT_MAX, E}, |
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{"hls_list_size", "maximum number of playlist entries", OFFSET(size), AV_OPT_TYPE_INT, {.i64 = 5}, 0, INT_MAX, E}, |
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{"hls_wrap", "number after which the index wraps", OFFSET(wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E}, |
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{ NULL }, |
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}; |
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static const AVClass hls_class = { |
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.class_name = "hls muxer", |
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.item_name = av_default_item_name, |
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.option = options, |
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.version = LIBAVUTIL_VERSION_INT, |
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}; |
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AVOutputFormat ff_hls_muxer = { |
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.name = "hls", |
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.long_name = NULL_IF_CONFIG_SMALL("hls"), |
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.extensions = "m3u8", |
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.priv_data_size = sizeof(HLSContext), |
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.audio_codec = AV_CODEC_ID_MP2, |
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.video_codec = AV_CODEC_ID_MPEG2VIDEO, |
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.flags = AVFMT_NOFILE | AVFMT_ALLOW_FLUSH, |
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.write_header = hls_write_header, |
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.write_packet = hls_write_packet, |
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.write_trailer = hls_write_trailer, |
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.priv_class = &hls_class, |
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}; |
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