#include "internal.h"
#include "mpeg.h"
+#if CONFIG_VOBSUB_DEMUXER
+# include "subtitles.h"
+# include "libavutil/bprint.h"
+#endif
+
#undef NDEBUG
#include <assert.h>
int32_t header_state;
unsigned char psm_es_type[256];
int sofdec;
+#if CONFIG_VOBSUB_DEMUXER
+ AVFormatContext *sub_ctx;
+ FFDemuxSubtitlesQueue q;
+#endif
} MpegDemuxContext;
static int mpegps_read_header(AVFormatContext *s)
.read_timestamp = mpegps_read_dts,
.flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
};
+
+#if CONFIG_VOBSUB_DEMUXER
+
+#define REF_STRING "# VobSub index file,"
+
+static int vobsub_probe(AVProbeData *p)
+{
+ if (!strncmp(p->buf, REF_STRING, sizeof(REF_STRING) - 1))
+ return AVPROBE_SCORE_MAX;
+ return 0;
+}
+
+static int vobsub_read_header(AVFormatContext *s)
+{
+ int i, header_size, ret = 0, header_parsed = 0, langidx = 0;
+ MpegDemuxContext *vobsub = s->priv_data;
+ char *sub_name = NULL;
+ size_t fname_len;
+ char *ext, *header_str;
+ AVBPrint header;
+ int64_t delay = 0;
+ AVStream *st = NULL;
+
+ sub_name = av_strdup(s->filename);
+ fname_len = strlen(sub_name);
+ ext = sub_name - 3 + fname_len;
+ if (fname_len < 4 || *(ext - 1) != '.') {
+ av_log(s, AV_LOG_ERROR, "The input index filename is too short "
+ "to guess the associated .SUB file\n");
+ ret = AVERROR_INVALIDDATA;
+ goto end;
+ }
+ memcpy(ext, !strncmp(ext, "IDX", 3) ? "SUB" : "sub", 3);
+ av_log(s, AV_LOG_VERBOSE, "IDX/SUB: %s -> %s\n", s->filename, sub_name);
+ ret = avformat_open_input(&vobsub->sub_ctx, sub_name, &ff_mpegps_demuxer, NULL);
+ if (ret < 0) {
+ av_log(s, AV_LOG_ERROR, "Unable to open %s as MPEG subtitles\n", sub_name);
+ goto end;
+ }
+
+ av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED);
+ while (!url_feof(s->pb)) {
+ char line[2048];
+ int len = ff_get_line(s->pb, line, sizeof(line));
+
+ if (!len)
+ break;
+
+ line[strcspn(line, "\r\n")] = 0;
+
+ if (!strncmp(line, "id:", 3)) {
+ int n, stream_id = 0;
+ char id[64] = {0};
+
+ n = sscanf(line, "id: %63[^,], index: %u", id, &stream_id);
+ if (n != 2) {
+ av_log(s, AV_LOG_WARNING, "Unable to parse index line '%s', "
+ "assuming 'id: und, index: 0'\n", line);
+ strcpy(id, "und");
+ stream_id = 0;
+ }
+
+ st = avformat_new_stream(s, NULL);
+ if (!st) {
+ ret = AVERROR(ENOMEM);
+ goto end;
+ }
+ st->id = stream_id;
+ st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
+ st->codec->codec_id = AV_CODEC_ID_DVD_SUBTITLE;
+ av_dict_set(&st->metadata, "language", id, 0);
+ av_log(s, AV_LOG_DEBUG, "IDX stream[%d] id=%s\n", stream_id, id);
+ header_parsed = 1;
+
+ } else if (st && !strncmp(line, "timestamp:", 10)) {
+ AVPacket *sub;
+ int hh, mm, ss, ms;
+ int64_t pos, timestamp;
+ const char *p = line + 10;
+
+ if (sscanf(p, "%02d:%02d:%02d:%03d, filepos: %"PRIx64,
+ &hh, &mm, &ss, &ms, &pos) != 5) {
+ av_log(s, AV_LOG_ERROR, "Unable to parse timestamp line '%s', "
+ "abort parsing\n", line);
+ break;
+ }
+ timestamp = (hh*3600LL + mm*60LL + ss) * 1000LL + ms + delay;
+ timestamp = av_rescale_q(timestamp, (AVRational){1,1000}, st->time_base);
+
+ sub = ff_subtitles_queue_insert(&vobsub->q, "", 0, 0);
+ if (!sub) {
+ ret = AVERROR(ENOMEM);
+ goto end;
+ }
+ sub->pos = pos;
+ sub->pts = timestamp;
+ sub->stream_index = s->nb_streams - 1;
+
+ } else if (st && !strncmp(line, "alt:", 4)) {
+ const char *p = line + 4;
+
+ while (*p == ' ')
+ p++;
+ av_dict_set(&st->metadata, "title", p, 0);
+ av_log(s, AV_LOG_DEBUG, "IDX stream[%d] name=%s\n", st->id, p);
+ header_parsed = 1;
+
+ } else if (!strncmp(line, "delay:", 6)) {
+ int sign = 1, hh = 0, mm = 0, ss = 0, ms = 0;
+ const char *p = line + 6;
+
+ while (*p == ' ')
+ p++;
+ if (*p == '-' || *p == '+') {
+ sign = *p == '-' ? -1 : 1;
+ p++;
+ }
+ sscanf(p, "%d:%d:%d:%d", &hh, &mm, &ss, &ms);
+ delay = ((hh*3600LL + mm*60LL + ss) * 1000LL + ms) * sign;
+
+ } else if (!strncmp(line, "langidx:", 8)) {
+ const char *p = line + 8;
+
+ if (sscanf(p, "%d", &langidx) != 1)
+ av_log(s, AV_LOG_ERROR, "Invalid langidx specified\n");
+
+ } else if (!header_parsed) {
+ if (line[0] && line[0] != '#')
+ av_bprintf(&header, "%s\n", line);
+ }
+ }
+
+ if (langidx < s->nb_streams)
+ s->streams[langidx]->disposition |= AV_DISPOSITION_DEFAULT;
+
+ ff_subtitles_queue_finalize(&vobsub->q);
+
+ if (!av_bprint_is_complete(&header)) {
+ av_bprint_finalize(&header, NULL);
+ ret = AVERROR(ENOMEM);
+ goto end;
+ }
+ av_bprint_finalize(&header, &header_str);
+ header_size = header.len + 1;
+ for (i = 0; i < s->nb_streams; i++) {
+ AVStream *sub_st = s->streams[i];
+ sub_st->codec->extradata = av_strdup(header_str);
+ sub_st->codec->extradata_size = header_size;
+ }
+ av_free(header_str);
+
+end:
+ av_free(sub_name);
+ return ret;
+}
+
+static int vobsub_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ MpegDemuxContext *vobsub = s->priv_data;
+ FFDemuxSubtitlesQueue *q = &vobsub->q;
+ AVIOContext *pb = vobsub->sub_ctx->pb;
+ int ret, psize, len16 = -1;
+ AVPacket idx_pkt;
+
+ ret = ff_subtitles_queue_read_packet(q, &idx_pkt);
+ if (ret < 0)
+ return ret;
+
+ /* compute maximum packet size using the next packet position. This is
+ * useful when the len in the header is non-sense */
+ if (q->current_sub_idx < q->nb_subs) {
+ psize = q->subs[q->current_sub_idx].pos - idx_pkt.pos;
+ } else {
+ int64_t fsize = avio_size(pb);
+ psize = fsize < 0 ? 0xffff : fsize - idx_pkt.pos;
+ }
+
+ avio_seek(pb, idx_pkt.pos, SEEK_SET);
+
+ av_init_packet(pkt);
+ pkt->size = 0;
+ pkt->data = NULL;
+
+ do {
+ int n, to_read, startcode;
+ int64_t pts, dts;
+
+ ret = mpegps_read_pes_header(vobsub->sub_ctx, NULL, &startcode, &pts, &dts);
+ if (ret < 0)
+ return ret;
+ to_read = ret & 0xffff;
+
+ /* this prevents reads above the current packet */
+ if (pkt->size + to_read > psize)
+ break;
+
+ /* if the len is computed, we check for overread */
+ if (len16 != -1 && pkt->size + to_read > len16)
+ break;
+
+ /* the current chunk doesn't match the stream index (unlikely) */
+ if ((startcode & 0x1f) != idx_pkt.stream_index)
+ break;
+
+ ret = av_grow_packet(pkt, to_read);
+ if (ret < 0)
+ return ret;
+
+ n = avio_read(pb, pkt->data + (pkt->size - to_read), to_read);
+ if (n < to_read)
+ pkt->size -= to_read - n;
+
+ /* first chunk contains the total len of the packet to raise */
+ if (len16 == -1 && n > 2)
+ len16 = AV_RB16(pkt->data);
+ } while (len16 != -1 && pkt->size != len16);
+
+ pkt->pts = pkt->dts = idx_pkt.pts;
+ pkt->pos = idx_pkt.pos;
+ pkt->stream_index = idx_pkt.stream_index;
+
+ return 0;
+}
+
+static int vobsub_read_seek(AVFormatContext *s, int stream_index,
+ int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
+{
+ MpegDemuxContext *vobsub = s->priv_data;
+ return ff_subtitles_queue_seek(&vobsub->q, s, stream_index,
+ min_ts, ts, max_ts, flags);
+}
+
+static int vobsub_read_close(AVFormatContext *s)
+{
+ MpegDemuxContext *vobsub = s->priv_data;
+ ff_subtitles_queue_clean(&vobsub->q);
+ if (vobsub->sub_ctx)
+ avformat_close_input(&vobsub->sub_ctx);
+ return 0;
+}
+
+AVInputFormat ff_vobsub_demuxer = {
+ .name = "vobsub",
+ .long_name = NULL_IF_CONFIG_SMALL("VobSub subtitle format"),
+ .priv_data_size = sizeof(MpegDemuxContext),
+ .read_probe = vobsub_probe,
+ .read_header = vobsub_read_header,
+ .read_packet = vobsub_read_packet,
+ .read_seek2 = vobsub_read_seek,
+ .read_close = vobsub_read_close,
+ .flags = AVFMT_SHOW_IDS,
+ .extensions = "idx",
+};
+#endif
projects / ffmpeg / blobdiff