diff options
Diffstat (limited to 'libavformat/segment.c')
-rw-r--r-- | libavformat/segment.c | 410 |
1 files changed, 300 insertions, 110 deletions
diff --git a/libavformat/segment.c b/libavformat/segment.c index fd52835..b6697e0 100644 --- a/libavformat/segment.c +++ b/libavformat/segment.c @@ -1,5 +1,4 @@ /* - * Generic segmenter * Copyright (c) 2011, Luca Barbato * * This file is part of Libav. @@ -19,40 +18,80 @@ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ +/** + * @file generic segmenter + * M3U8 specification can be find here: + * @url{http://tools.ietf.org/id/draft-pantos-http-live-streaming-08.txt} + */ + #include <float.h> #include "avformat.h" #include "internal.h" +#include "libavutil/avassert.h" #include "libavutil/log.h" #include "libavutil/opt.h" #include "libavutil/avstring.h" #include "libavutil/parseutils.h" #include "libavutil/mathematics.h" +typedef enum { + LIST_TYPE_UNDEFINED = -1, + LIST_TYPE_FLAT = 0, + LIST_TYPE_CSV, + LIST_TYPE_M3U8, + LIST_TYPE_EXT, ///< deprecated + LIST_TYPE_NB, +} ListType; + + +#define SEGMENT_LIST_FLAG_CACHE 1 +#define SEGMENT_LIST_FLAG_LIVE 2 + typedef struct { const AVClass *class; /**< Class for private options. */ - int number; + int segment_idx; ///< index of the segment file to write, starting from 0 + int segment_idx_wrap; ///< number after which the index wraps + int segment_count; ///< number of segment files already written AVOutputFormat *oformat; AVFormatContext *avf; - char *format; /**< Set by a private option. */ - char *list; /**< Set by a private option. */ - int list_type; /**< Set by a private option. */ - float time; /**< Set by a private option. */ - int size; /**< Set by a private option. */ - int wrap; /**< Set by a private option. */ + char *format; ///< format to use for output segment files + char *list; ///< filename for the segment list file + int list_count; ///< list counter + int list_flags; ///< flags affecting list generation + int list_size; ///< number of entries for the segment list file + double list_max_segment_time; ///< max segment time in the current list + ListType list_type; ///< set the list type + AVIOContext *list_pb; ///< list file put-byte context + char *time_str; ///< segment duration specification string + int64_t time; ///< segment duration + char *times_str; ///< segment times specification string + int64_t *times; ///< list of segment interval specification + int nb_times; ///< number of elments in the times array + char *time_delta_str; ///< approximation value duration used for the segment times + int64_t time_delta; int individual_header_trailer; /**< Set by a private option. */ int write_header_trailer; /**< Set by a private option. */ - int64_t offset_time; - int64_t recording_time; int has_video; - AVIOContext *pb; + double start_time, end_time; } SegmentContext; -enum { - LIST_FLAT, - LIST_HLS -}; +static void print_csv_escaped_str(AVIOContext *ctx, const char *str) +{ + int needs_quoting = !!str[strcspn(str, "\",\n\r")]; + + if (needs_quoting) + avio_w8(ctx, '"'); + + for (; *str; str++) { + if (*str == '"') + avio_w8(ctx, '"'); + avio_w8(ctx, *str); + } + if (needs_quoting) + avio_w8(ctx, '"'); +} static int segment_mux_init(AVFormatContext *s) { @@ -78,36 +117,6 @@ static int segment_mux_init(AVFormatContext *s) return 0; } -static int segment_hls_window(AVFormatContext *s, int last) -{ - SegmentContext *seg = s->priv_data; - int i, ret = 0; - char buf[1024]; - - if ((ret = avio_open2(&seg->pb, seg->list, AVIO_FLAG_WRITE, - &s->interrupt_callback, NULL)) < 0) - goto fail; - - avio_printf(seg->pb, "#EXTM3U\n"); - avio_printf(seg->pb, "#EXT-X-VERSION:3\n"); - avio_printf(seg->pb, "#EXT-X-TARGETDURATION:%d\n", (int)seg->time); - avio_printf(seg->pb, "#EXT-X-MEDIA-SEQUENCE:%d\n", - FFMAX(0, seg->number - seg->size)); - - for (i = FFMAX(0, seg->number - seg->size); - i < seg->number; i++) { - avio_printf(seg->pb, "#EXTINF:%d,\n", (int)seg->time); - av_get_frame_filename(buf, sizeof(buf), s->filename, i); - avio_printf(seg->pb, "%s\n", buf); - } - - if (last) - avio_printf(seg->pb, "#EXT-X-ENDLIST\n"); -fail: - avio_closep(&seg->pb); - return ret; -} - static int segment_start(AVFormatContext *s, int write_header) { SegmentContext *c = s->priv_data; @@ -122,12 +131,15 @@ static int segment_start(AVFormatContext *s, int write_header) oc = c->avf; } - if (c->wrap) - c->number %= c->wrap; + if (c->segment_idx_wrap) + c->segment_idx %= c->segment_idx_wrap; if (av_get_frame_filename(oc->filename, sizeof(oc->filename), - s->filename, c->number++) < 0) + s->filename, c->segment_idx++) < 0) { + av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", s->filename); return AVERROR(EINVAL); + } + c->segment_count++; if ((err = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL)) < 0) @@ -144,18 +156,139 @@ static int segment_start(AVFormatContext *s, int write_header) return 0; } -static int segment_end(AVFormatContext *oc, int write_trailer) +static int segment_list_open(AVFormatContext *s) +{ + SegmentContext *seg = s->priv_data; + int ret; + + ret = avio_open2(&seg->list_pb, seg->list, AVIO_FLAG_WRITE, + &s->interrupt_callback, NULL); + if (ret < 0) + return ret; + seg->list_max_segment_time = 0; + + if (seg->list_type == LIST_TYPE_M3U8) { + avio_printf(seg->list_pb, "#EXTM3U\n"); + avio_printf(seg->list_pb, "#EXT-X-VERSION:3\n"); + avio_printf(seg->list_pb, "#EXT-X-MEDIA-SEQUENCE:%d\n", seg->list_count); + avio_printf(seg->list_pb, "#EXT-X-ALLOWCACHE:%d\n", + !!(seg->list_flags & SEGMENT_LIST_FLAG_CACHE)); + if (seg->list_flags & SEGMENT_LIST_FLAG_LIVE) + avio_printf(seg->list_pb, + "#EXT-X-TARGETDURATION:%"PRId64"\n", seg->time / 1000000); + } + + return ret; +} + +static void segment_list_close(AVFormatContext *s) { + SegmentContext *seg = s->priv_data; + + if (seg->list_type == LIST_TYPE_M3U8) { + if (!(seg->list_flags & SEGMENT_LIST_FLAG_LIVE)) + avio_printf(seg->list_pb, "#EXT-X-TARGETDURATION:%d\n", + (int)ceil(seg->list_max_segment_time)); + avio_printf(seg->list_pb, "#EXT-X-ENDLIST\n"); + } + seg->list_count++; + + avio_close(seg->list_pb); +} + +static int segment_end(AVFormatContext *s, int write_trailer) +{ + SegmentContext *seg = s->priv_data; + AVFormatContext *oc = seg->avf; int ret = 0; av_write_frame(oc, NULL); /* Flush any buffered data (fragmented mp4) */ if (write_trailer) - av_write_trailer(oc); + ret = av_write_trailer(oc); + + if (ret < 0) + av_log(s, AV_LOG_ERROR, "Failure occurred when ending segment '%s'\n", + oc->filename); + + if (seg->list) { + if (seg->list_size && !(seg->segment_count % seg->list_size)) { + segment_list_close(s); + if ((ret = segment_list_open(s)) < 0) + goto end; + } + + if (seg->list_type == LIST_TYPE_FLAT) { + avio_printf(seg->list_pb, "%s\n", oc->filename); + } else if (seg->list_type == LIST_TYPE_CSV || seg->list_type == LIST_TYPE_EXT) { + print_csv_escaped_str(seg->list_pb, oc->filename); + avio_printf(seg->list_pb, ",%f,%f\n", seg->start_time, seg->end_time); + } else if (seg->list_type == LIST_TYPE_M3U8) { + avio_printf(seg->list_pb, "#EXTINF:%f,\n%s\n", + seg->end_time - seg->start_time, oc->filename); + } + seg->list_max_segment_time = FFMAX(seg->end_time - seg->start_time, seg->list_max_segment_time); + avio_flush(seg->list_pb); + } + +end: avio_close(oc->pb); return ret; } +static int parse_times(void *log_ctx, int64_t **times, int *nb_times, + const char *times_str) +{ + char *p; + int i, ret = 0; + char *times_str1 = av_strdup(times_str); + char *saveptr = NULL; + + if (!times_str1) + return AVERROR(ENOMEM); + +#define FAIL(err) ret = err; goto end + + *nb_times = 1; + for (p = times_str1; *p; p++) + if (*p == ',') + (*nb_times)++; + + *times = av_malloc(sizeof(**times) * *nb_times); + if (!*times) { + av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced times array\n"); + FAIL(AVERROR(ENOMEM)); + } + + p = times_str1; + for (i = 0; i < *nb_times; i++) { + int64_t t; + char *tstr = av_strtok(p, ",", &saveptr); + av_assert0(tstr); + p = NULL; + + ret = av_parse_time(&t, tstr, 1); + if (ret < 0) { + av_log(log_ctx, AV_LOG_ERROR, + "Invalid time duration specification in %s\n", p); + FAIL(AVERROR(EINVAL)); + } + (*times)[i] = t; + + /* check on monotonicity */ + if (i && (*times)[i-1] > (*times)[i]) { + av_log(log_ctx, AV_LOG_ERROR, + "Specified time %f is greater than the following time %f\n", + (float)((*times)[i])/1000000, (float)((*times)[i-1])/1000000); + FAIL(AVERROR(EINVAL)); + } + } + +end: + av_free(times_str1); + return ret; +} + static int open_null_ctx(AVIOContext **ctx) { int buf_size = 32768; @@ -182,16 +315,59 @@ static int seg_write_header(AVFormatContext *s) AVFormatContext *oc = NULL; int ret, i; - seg->number = 0; - seg->offset_time = 0; - seg->recording_time = seg->time * 1000000; + seg->segment_count = 0; if (!seg->write_header_trailer) seg->individual_header_trailer = 0; - if (seg->list && seg->list_type != LIST_HLS) - if ((ret = avio_open2(&seg->pb, seg->list, AVIO_FLAG_WRITE, - &s->interrupt_callback, NULL)) < 0) + if (seg->time_str && seg->times_str) { + av_log(s, AV_LOG_ERROR, + "segment_time and segment_times options are mutually exclusive, select just one of them\n"); + return AVERROR(EINVAL); + } + + if ((seg->list_flags & SEGMENT_LIST_FLAG_LIVE) && seg->times_str) { + av_log(s, AV_LOG_ERROR, + "segment_flags +live and segment_times options are mutually exclusive:" + "specify -segment_time if you want a live-friendly list\n"); + return AVERROR(EINVAL); + } + + if (seg->times_str) { + if ((ret = parse_times(s, &seg->times, &seg->nb_times, seg->times_str)) < 0) + return ret; + } else { + /* set default value if not specified */ + if (!seg->time_str) + seg->time_str = av_strdup("2"); + if ((ret = av_parse_time(&seg->time, seg->time_str, 1)) < 0) { + av_log(s, AV_LOG_ERROR, + "Invalid time duration specification '%s' for segment_time option\n", + seg->time_str); + return ret; + } + } + + if (seg->time_delta_str) { + if ((ret = av_parse_time(&seg->time_delta, seg->time_delta_str, 1)) < 0) { + av_log(s, AV_LOG_ERROR, + "Invalid time duration specification '%s' for delta option\n", + seg->time_delta_str); + return ret; + } + } + + if (seg->list) { + if (seg->list_type == LIST_TYPE_UNDEFINED) { + if (av_match_ext(seg->list, "csv" )) seg->list_type = LIST_TYPE_CSV; + else if (av_match_ext(seg->list, "ext" )) seg->list_type = LIST_TYPE_EXT; + else if (av_match_ext(seg->list, "m3u8")) seg->list_type = LIST_TYPE_M3U8; + else seg->list_type = LIST_TYPE_FLAT; + } + if ((ret = segment_list_open(s)) < 0) goto fail; + } + if (seg->list_type == LIST_TYPE_EXT) + av_log(s, AV_LOG_WARNING, "'ext' list type option is deprecated in favor of 'csv'\n"); for (i = 0; i < s->nb_streams; i++) seg->has_video += @@ -220,10 +396,11 @@ static int seg_write_header(AVFormatContext *s) oc = seg->avf; if (av_get_frame_filename(oc->filename, sizeof(oc->filename), - s->filename, seg->number++) < 0) { + s->filename, seg->segment_idx++) < 0) { ret = AVERROR(EINVAL); goto fail; } + seg->segment_count++; if (seg->write_header_trailer) { if ((ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE, @@ -239,6 +416,9 @@ static int seg_write_header(AVFormatContext *s) goto fail; } + if (oc->avoid_negative_ts > 0 && s->avoid_negative_ts < 0) + s->avoid_negative_ts = 1; + if (!seg->write_header_trailer) { close_null_ctx(oc->pb); if ((ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE, @@ -246,20 +426,10 @@ static int seg_write_header(AVFormatContext *s) goto fail; } - if (seg->list) { - if (seg->list_type == LIST_HLS) { - if ((ret = segment_hls_window(s, 0)) < 0) - goto fail; - } else { - avio_printf(seg->pb, "%s\n", oc->filename); - avio_flush(seg->pb); - } - } - fail: if (ret) { if (seg->list) - avio_close(seg->pb); + segment_list_close(s); if (seg->avf) avformat_free_context(seg->avf); } @@ -271,18 +441,26 @@ static int seg_write_packet(AVFormatContext *s, AVPacket *pkt) SegmentContext *seg = s->priv_data; AVFormatContext *oc = seg->avf; AVStream *st = s->streams[pkt->stream_index]; - int64_t end_pts = seg->recording_time * seg->number; + int64_t end_pts; int ret; - if ((seg->has_video && st->codec->codec_type == AVMEDIA_TYPE_VIDEO) && + if (seg->times) { + end_pts = seg->segment_count <= seg->nb_times ? + seg->times[seg->segment_count-1] : INT64_MAX; + } else { + end_pts = seg->time * seg->segment_count; + } + + /* if the segment has video, start a new segment *only* with a key video frame */ + if ((st->codec->codec_type == AVMEDIA_TYPE_VIDEO || !seg->has_video) && av_compare_ts(pkt->pts, st->time_base, - end_pts, AV_TIME_BASE_Q) >= 0 && + end_pts-seg->time_delta, AV_TIME_BASE_Q) >= 0 && pkt->flags & AV_PKT_FLAG_KEY) { - av_log(s, AV_LOG_DEBUG, "Next segment starts at %d %"PRId64"\n", - pkt->stream_index, pkt->pts); + av_log(s, AV_LOG_DEBUG, "Next segment starts with packet stream:%d pts:%"PRId64" pts_time:%f\n", + pkt->stream_index, pkt->pts, pkt->pts * av_q2d(st->time_base)); - ret = segment_end(oc, seg->individual_header_trailer); + ret = segment_end(s, seg->individual_header_trailer); if (!ret) ret = segment_start(s, seg->individual_header_trailer); @@ -292,21 +470,10 @@ static int seg_write_packet(AVFormatContext *s, AVPacket *pkt) oc = seg->avf; - if (seg->list) { - if (seg->list_type == LIST_HLS) { - if ((ret = segment_hls_window(s, 0)) < 0) - goto fail; - } else { - avio_printf(seg->pb, "%s\n", oc->filename); - avio_flush(seg->pb); - if (seg->size && !(seg->number % seg->size)) { - avio_closep(&seg->pb); - if ((ret = avio_open2(&seg->pb, seg->list, AVIO_FLAG_WRITE, - &s->interrupt_callback, NULL)) < 0) - goto fail; - } - } - } + seg->start_time = (double)pkt->pts * av_q2d(st->time_base); + } else if (pkt->pts != AV_NOPTS_VALUE) { + seg->end_time = FFMAX(seg->end_time, + (double)(pkt->pts + pkt->duration) * av_q2d(st->time_base)); } ret = ff_write_chained(oc, pkt->stream_index, pkt, s); @@ -314,7 +481,7 @@ static int seg_write_packet(AVFormatContext *s, AVPacket *pkt) fail: if (ret < 0) { if (seg->list) - avio_close(seg->pb); + avio_close(seg->list_pb); avformat_free_context(oc); } @@ -327,25 +494,21 @@ static int seg_write_trailer(struct AVFormatContext *s) AVFormatContext *oc = seg->avf; int ret; if (!seg->write_header_trailer) { - if ((ret = segment_end(oc, 0)) < 0) + if ((ret = segment_end(s, 0)) < 0) goto fail; open_null_ctx(&oc->pb); ret = av_write_trailer(oc); close_null_ctx(oc->pb); } else { - ret = segment_end(oc, 1); + ret = segment_end(s, 1); } +fail: + if (seg->list) + segment_list_close(s); - if (ret < 0) - goto fail; - - if (seg->list && seg->list_type == LIST_HLS) { - if ((ret = segment_hls_window(s, 1) < 0)) - goto fail; - } + av_opt_free(seg); + av_freep(&seg->times); -fail: - avio_close(seg->pb); avformat_free_context(oc); return ret; } @@ -353,14 +516,24 @@ fail: #define OFFSET(x) offsetof(SegmentContext, x) #define E AV_OPT_FLAG_ENCODING_PARAM static const AVOption options[] = { - { "segment_format", "container format used for the segments", OFFSET(format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E }, - { "segment_time", "segment length in seconds", OFFSET(time), AV_OPT_TYPE_FLOAT, {.dbl = 2}, 0, FLT_MAX, E }, - { "segment_list", "output the segment list", OFFSET(list), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E }, - { "segment_list_size", "maximum number of playlist entries", OFFSET(size), AV_OPT_TYPE_INT, {.i64 = 5}, 0, INT_MAX, E }, - { "segment_list_type", "segment list format", OFFSET(list_type), AV_OPT_TYPE_INT, {.i64 = LIST_FLAT}, 0, 2, E, "list_type" }, - { "flat", "plain list (default)", 0, AV_OPT_TYPE_CONST, {.i64 = LIST_FLAT}, 0, 0, E, "list_type" }, - { "hls", "Apple HTTP Live Streaming compatible", 0, AV_OPT_TYPE_CONST, {.i64 = LIST_HLS}, 0, 0, E, "list_type" }, - { "segment_wrap", "number after which the index wraps", OFFSET(wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E }, + { "segment_format", "set container format used for the segments", OFFSET(format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E }, + { "segment_list", "set the segment list filename", OFFSET(list), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E }, + + { "segment_list_flags","set flags affecting segment list generation", OFFSET(list_flags), AV_OPT_TYPE_FLAGS, {.i64 = SEGMENT_LIST_FLAG_CACHE }, 0, UINT_MAX, E, "list_flags"}, + { "cache", "allow list caching", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_LIST_FLAG_CACHE }, INT_MIN, INT_MAX, E, "list_flags"}, + { "live", "enable live-friendly list generation (useful for HLS)", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_LIST_FLAG_LIVE }, INT_MIN, INT_MAX, E, "list_flags"}, + + { "segment_list_size", "set the maximum number of playlist entries", OFFSET(list_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E }, + { "segment_list_type", "set the segment list type", OFFSET(list_type), AV_OPT_TYPE_INT, {.i64 = LIST_TYPE_UNDEFINED}, -1, LIST_TYPE_NB-1, E, "list_type" }, + { "flat", "flat format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_FLAT }, INT_MIN, INT_MAX, 0, "list_type" }, + { "csv", "csv format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_CSV }, INT_MIN, INT_MAX, 0, "list_type" }, + { "ext", "extended format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_EXT }, INT_MIN, INT_MAX, 0, "list_type" }, + { "m3u8", "M3U8 format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, 0, "list_type" }, + { "hls", "Apple HTTP Live Streaming compatible", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, 0, "list_type" }, + { "segment_time", "set segment duration", OFFSET(time_str),AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E }, + { "segment_time_delta","set approximation value used for the segment times", OFFSET(time_delta_str), AV_OPT_TYPE_STRING, {.str = "0"}, 0, 0, E }, + { "segment_times", "set segment split time points", OFFSET(times_str),AV_OPT_TYPE_STRING,{.str = NULL}, 0, 0, E }, + { "segment_wrap", "set number after which the index wraps", OFFSET(segment_idx_wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E }, { "individual_header_trailer", "write header/trailer to each segment", OFFSET(individual_header_trailer), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, E }, { "write_header_trailer", "write a header to the first segment and a trailer to the last one", OFFSET(write_header_trailer), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, E }, { NULL }, @@ -373,7 +546,6 @@ static const AVClass seg_class = { .version = LIBAVUTIL_VERSION_INT, }; - AVOutputFormat ff_segment_muxer = { .name = "segment", .long_name = NULL_IF_CONFIG_SMALL("segment"), @@ -384,3 +556,21 @@ AVOutputFormat ff_segment_muxer = { .write_trailer = seg_write_trailer, .priv_class = &seg_class, }; + +static const AVClass sseg_class = { + .class_name = "stream_segment muxer", + .item_name = av_default_item_name, + .option = options, + .version = LIBAVUTIL_VERSION_INT, +}; + +AVOutputFormat ff_stream_segment_muxer = { + .name = "stream_segment,ssegment", + .long_name = NULL_IF_CONFIG_SMALL("streaming segment muxer"), + .priv_data_size = sizeof(SegmentContext), + .flags = AVFMT_NOFILE, + .write_header = seg_write_header, + .write_packet = seg_write_packet, + .write_trailer = seg_write_trailer, + .priv_class = &sseg_class, +}; |