diff options
Diffstat (limited to 'libavformat/assdec.c')
-rw-r--r-- | libavformat/assdec.c | 261 |
1 files changed, 112 insertions, 149 deletions
diff --git a/libavformat/assdec.c b/libavformat/assdec.c index f9f1bdf..c62e76f 100644 --- a/libavformat/assdec.c +++ b/libavformat/assdec.c @@ -1,224 +1,187 @@ /* * SSA/ASS demuxer * Copyright (c) 2008 Michael Niedermayer + * Copyright (c) 2014 Clément Bœsch * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * 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. * - * Libav is distributed in the hope that it will be useful, + * 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 Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <stdint.h> -#include "libavutil/mathematics.h" - #include "avformat.h" #include "internal.h" - -#define MAX_LINESIZE 2000 +#include "subtitles.h" +#include "libavcodec/internal.h" +#include "libavutil/bprint.h" typedef struct ASSContext { - uint8_t *event_buffer; - uint8_t **event; - unsigned int event_count; - unsigned int event_index; + FFDemuxSubtitlesQueue q; + unsigned readorder; } ASSContext; -static int probe(AVProbeData *p) +static int ass_probe(AVProbeData *p) { - const char *header = "[Script Info]"; + char buf[13]; + FFTextReader tr; + ff_text_init_buf(&tr, p->buf, p->buf_size); - if (!memcmp(p->buf, header, strlen(header)) || - !memcmp(p->buf + 3, header, strlen(header))) + ff_text_read(&tr, buf, sizeof(buf)); + + if (!memcmp(buf, "[Script Info]", 13)) return AVPROBE_SCORE_MAX; return 0; } -static int read_close(AVFormatContext *s) +static int ass_read_close(AVFormatContext *s) { ASSContext *ass = s->priv_data; - - av_freep(&ass->event_buffer); - av_freep(&ass->event); - + ff_subtitles_queue_clean(&ass->q); return 0; } -static int64_t get_pts(const uint8_t *p) +static int read_dialogue(ASSContext *ass, AVBPrint *dst, const uint8_t *p, + int64_t *start, int *duration) { - int hour, min, sec, hsec; - - if (sscanf(p, "%*[^,],%d:%d:%d%*c%d", &hour, &min, &sec, &hsec) != 4) - return AV_NOPTS_VALUE; - - av_log(NULL, AV_LOG_TRACE, "%d %d %d %d [%s]\n", hour, min, sec, hsec, p); - - min += 60 * hour; - sec += 60 * min; - - return sec * 100 + hsec; + int pos = 0; + int64_t end; + int hh1, mm1, ss1, ms1; + int hh2, mm2, ss2, ms2; + + if (sscanf(p, "Dialogue: %*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d,%n", + &hh1, &mm1, &ss1, &ms1, + &hh2, &mm2, &ss2, &ms2, &pos) >= 8 && pos > 0) { + + /* This is not part of the sscanf itself in order to handle an actual + * number (which would be the Layer) or the form "Marked=N" (which is + * the old SSA field, now replaced by Layer, and will lead to Layer + * being 0 here). */ + const int layer = atoi(p + 10); + + end = (hh2*3600LL + mm2*60LL + ss2) * 100LL + ms2; + *start = (hh1*3600LL + mm1*60LL + ss1) * 100LL + ms1; + *duration = end - *start; + + av_bprint_clear(dst); + av_bprintf(dst, "%u,%d,%s", ass->readorder++, layer, p + pos); + + /* right strip the buffer */ + while (dst->len > 0 && + dst->str[dst->len - 1] == '\r' || + dst->str[dst->len - 1] == '\n') + dst->str[--dst->len] = 0; + return 0; + } + return -1; } -static int event_cmp(const void *_a, const void *_b) +static int64_t get_line(AVBPrint *buf, FFTextReader *tr) { - const uint8_t *const *a = _a, *const *b = _b; - return get_pts(*a) - get_pts(*b); + int64_t pos = ff_text_pos(tr); + + av_bprint_clear(buf); + for (;;) { + char c = ff_text_r8(tr); + if (!c) + break; + av_bprint_chars(buf, c, 1); + if (c == '\n') + break; + } + return pos; } -static int read_header(AVFormatContext *s) +static int ass_read_header(AVFormatContext *s) { - int i, len, header_remaining; ASSContext *ass = s->priv_data; - AVIOContext *pb = s->pb; + AVBPrint header, line, rline; + int res = 0; AVStream *st; - int allocated[2] = { 0 }; - uint8_t *p, **dst[2] = { 0 }; - int pos[2] = { 0 }; + FFTextReader tr; + ff_text_init_avio(s, &tr, s->pb); st = avformat_new_stream(s, NULL); if (!st) - return -1; + return AVERROR(ENOMEM); avpriv_set_pts_info(st, 64, 1, 100); st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; - st->codec->codec_id = AV_CODEC_ID_SSA; + st->codec->codec_id = AV_CODEC_ID_ASS; - header_remaining = INT_MAX; - dst[0] = &st->codec->extradata; - dst[1] = &ass->event_buffer; - while (!pb->eof_reached) { - uint8_t line[MAX_LINESIZE]; + av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED); + av_bprint_init(&line, 0, AV_BPRINT_SIZE_UNLIMITED); + av_bprint_init(&rline, 0, AV_BPRINT_SIZE_UNLIMITED); - len = ff_get_line(pb, line, sizeof(line)); + for (;;) { + int64_t pos = get_line(&line, &tr); + int64_t ts_start = AV_NOPTS_VALUE; + int duration = -1; + AVPacket *sub; - if (!memcmp(line, "[Events]", 8)) - header_remaining = 2; - else if (line[0] == '[') - header_remaining = INT_MAX; + if (!line.str[0]) // EOF + break; - i = header_remaining == 0; - - if (i && get_pts(line) == AV_NOPTS_VALUE) + if (read_dialogue(ass, &rline, line.str, &ts_start, &duration) < 0) { + av_bprintf(&header, "%s", line.str); continue; - - p = av_fast_realloc(*(dst[i]), &allocated[i], pos[i] + MAX_LINESIZE); - if (!p) - goto fail; - *(dst[i]) = p; - memcpy(p + pos[i], line, len + 1); - pos[i] += len; - if (i) - ass->event_count++; - else - header_remaining--; - } - st->codec->extradata_size = pos[0]; - - if (ass->event_count >= UINT_MAX / sizeof(*ass->event)) - goto fail; - - ass->event = av_malloc(ass->event_count * sizeof(*ass->event)); - p = ass->event_buffer; - for (i = 0; i < ass->event_count; i++) { - ass->event[i] = p; - while (*p && *p != '\n') - p++; - p++; + } + sub = ff_subtitles_queue_insert(&ass->q, rline.str, rline.len, 0); + if (!sub) { + res = AVERROR(ENOMEM); + goto end; + } + sub->pos = pos; + sub->pts = ts_start; + sub->duration = duration; } - qsort(ass->event, ass->event_count, sizeof(*ass->event), event_cmp); - - return 0; + res = avpriv_bprint_to_extradata(st->codec, &header); + if (res < 0) + goto end; -fail: - read_close(s); + ff_subtitles_queue_finalize(&ass->q); - return -1; +end: + av_bprint_finalize(&header, NULL); + av_bprint_finalize(&line, NULL); + av_bprint_finalize(&rline, NULL); + return res; } -static int read_packet(AVFormatContext *s, AVPacket *pkt) +static int ass_read_packet(AVFormatContext *s, AVPacket *pkt) { ASSContext *ass = s->priv_data; - uint8_t *p, *end; - int ret; - - if (ass->event_index >= ass->event_count) - return AVERROR(EIO); - - p = ass->event[ass->event_index]; - - end = strchr(p, '\n'); - ret = av_new_packet(pkt, end ? end - p + 1 : strlen(p)); - if (ret < 0) - return ret; - pkt->flags |= AV_PKT_FLAG_KEY; - pkt->pos = p - ass->event_buffer + s->streams[0]->codec->extradata_size; - pkt->pts = pkt->dts = get_pts(p); - memcpy(pkt->data, p, pkt->size); - - ass->event_index++; - - return 0; + return ff_subtitles_queue_read_packet(&ass->q, pkt); } -static int read_seek2(AVFormatContext *s, int stream_index, - int64_t min_ts, int64_t ts, int64_t max_ts, int flags) +static int ass_read_seek(AVFormatContext *s, int stream_index, + int64_t min_ts, int64_t ts, int64_t max_ts, int flags) { ASSContext *ass = s->priv_data; - - if (flags & AVSEEK_FLAG_BYTE) { - return AVERROR(ENOSYS); - } else if (flags & AVSEEK_FLAG_FRAME) { - if (ts < 0 || ts >= ass->event_count) - return AVERROR(ERANGE); - ass->event_index = ts; - } else { - int i, idx = -1; - int64_t min_ts_diff = INT64_MAX; - if (stream_index == -1) { - AVRational time_base = s->streams[0]->time_base; - ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base); - min_ts = av_rescale_rnd(min_ts, time_base.den, - time_base.num * (int64_t) AV_TIME_BASE, - AV_ROUND_UP); - max_ts = av_rescale_rnd(max_ts, time_base.den, - time_base.num * (int64_t) AV_TIME_BASE, - AV_ROUND_DOWN); - } - /* TODO: ass->event[] is sorted by pts so we could do a binary search */ - for (i = 0; i < ass->event_count; i++) { - int64_t pts = get_pts(ass->event[i]); - int64_t ts_diff = FFABS(pts - ts); - if (pts >= min_ts && pts <= max_ts && ts_diff < min_ts_diff) { - min_ts_diff = ts_diff; - idx = i; - } - } - if (idx < 0) - return AVERROR(ERANGE); - ass->event_index = idx; - } - return 0; + return ff_subtitles_queue_seek(&ass->q, s, stream_index, + min_ts, ts, max_ts, flags); } AVInputFormat ff_ass_demuxer = { .name = "ass", .long_name = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"), .priv_data_size = sizeof(ASSContext), - .read_probe = probe, - .read_header = read_header, - .read_packet = read_packet, - .read_close = read_close, - .read_seek2 = read_seek2, + .read_probe = ass_probe, + .read_header = ass_read_header, + .read_packet = ass_read_packet, + .read_close = ass_read_close, + .read_seek2 = ass_read_seek, }; |