lavf/microdvd: rewrite using subtitles queue API.

libavformat/microdvddec.c

 /*
  * MicroDVD subtitle demuxer
  * Copyright (c) 2010  Aurelien Jacobs <aurel@gnuage.org>
+ * Copyright (c) 2012  Clément Bœsch <ubitux@gmail.com>
  *
  * This file is part of FFmpeg.
  *
@@ -21,16 +22,14 @@
 
 #include "avformat.h"
 #include "internal.h"
+#include "subtitles.h"
 #include "libavutil/intreadwrite.h"
 
 #define MAX_LINESIZE 2048
 
 
 typedef struct {
-    uint8_t lines[3][MAX_LINESIZE];
-    int64_t pos[3];
-    AVPacket last_pkt;
-    int last_pkt_ready;
+    FFDemuxSubtitlesQueue q;
 } MicroDVDContext;
 
 
@@ -52,36 +51,6 @@ static int microdvd_probe(AVProbeData *p)
     return AVPROBE_SCORE_MAX;
 }
 
-static int microdvd_read_header(AVFormatContext *s)
-{
-    AVRational pts_info = (AVRational){ 2997, 125 };  /* default: 23.976 fps */
-    MicroDVDContext *microdvd = s->priv_data;
-    AVStream *st = avformat_new_stream(s, NULL);
-    int i, frame;
-    double fps;
-    char c;
-
-    if (!st)
-        return AVERROR(ENOMEM);
-    for (i=0; i<FF_ARRAY_ELEMS(microdvd->lines); i++) {
-        microdvd->pos[i] = avio_tell(s->pb);
-        ff_get_line(s->pb, microdvd->lines[i], sizeof(microdvd->lines[i]));
-        if ((sscanf(microdvd->lines[i], "{%d}{}%6lf",    &frame, &fps) == 2 ||
-             sscanf(microdvd->lines[i], "{%d}{%*d}%6lf", &frame, &fps) == 2)
-            && frame <= 1 && fps > 3 && fps < 100)
-            pts_info = av_d2q(fps, 100000);
-        if (sscanf(microdvd->lines[i], "{DEFAULT}{}%c", &c) == 1) {
-            st->codec->extradata = av_strdup(microdvd->lines[i] + 11);
-            st->codec->extradata_size = strlen(st->codec->extradata);
-            i--;
-        }
-    }
-    avpriv_set_pts_info(st, 64, pts_info.den, pts_info.num);
-    st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
-    st->codec->codec_id   = CODEC_ID_MICRODVD;
-    return 0;
-}
-
 static int64_t get_pts(const char *buf)
 {
     int frame;
@@ -101,68 +70,67 @@ static int get_duration(const char *buf)
     return -1;
 }
 
-static int microdvd_read_packet(AVFormatContext *s, AVPacket *pkt)
+static int microdvd_read_header(AVFormatContext *s)
 {
+    AVRational pts_info = (AVRational){ 2997, 125 };  /* default: 23.976 fps */
     MicroDVDContext *microdvd = s->priv_data;
-    char buffer[MAX_LINESIZE];
-    int64_t pos = avio_tell(s->pb);
-    int i, len = 0, res = AVERROR_EOF;
-
-    // last packet has its duration set but couldn't be raised earlier
-    if (microdvd->last_pkt_ready) {
-        *pkt = microdvd->last_pkt;
-        microdvd->last_pkt_ready = 0;
-        return 0;
-    }
+    AVStream *st = avformat_new_stream(s, NULL);
+    int i = 0;
+    char line[MAX_LINESIZE];
+
+    if (!st)
+        return AVERROR(ENOMEM);
+
+    while (!url_feof(s->pb)) {
+        AVPacket *sub;
+        int64_t pos = avio_tell(s->pb);
+        int len = ff_get_line(s->pb, line, sizeof(line));
 
-    for (i=0; i<FF_ARRAY_ELEMS(microdvd->lines); i++) {
-        if (microdvd->lines[i][0]) {
-            strcpy(buffer, microdvd->lines[i]);
-            pos = microdvd->pos[i];
-            len = strlen(buffer);
-            microdvd->lines[i][0] = 0;
+        if (!len)
             break;
-        }
-    }
-    if (!len)
-        len = ff_get_line(s->pb, buffer, sizeof(buffer));
-
-    if (microdvd->last_pkt.duration == -1 && !buffer[0]) {
-        // if the previous subtitle line had no duration, last until the end of
-        // the presentation
-        microdvd->last_pkt.duration = 0;
-        *pkt = microdvd->last_pkt;
-        pkt->duration = -1;
-        res = 0;
-    } else if (buffer[0] && !(res = av_new_packet(pkt, len))) {
-        memcpy(pkt->data, buffer, len);
-        pkt->flags |= AV_PKT_FLAG_KEY;
-        pkt->pos = pos;
-        pkt->pts = pkt->dts = get_pts(buffer);
-
-        if (pkt->pts != AV_NOPTS_VALUE) {
-            pkt->duration = get_duration(buffer);
-            if (microdvd->last_pkt.duration == -1) {
-                // previous packet wasn't raised because it was lacking the
-                // duration info, so set its duration with the new packet pts
-                // and raise it
-                AVPacket tmp_pkt;
-
-                tmp_pkt = microdvd->last_pkt;
-                tmp_pkt.duration = pkt->pts - tmp_pkt.pts;
-                microdvd->last_pkt = *pkt;
-                microdvd->last_pkt_ready = pkt->duration != -1;
-                *pkt = tmp_pkt;
-            } else if (pkt->duration == -1) {
-                // no packet without duration queued, and current one is
-                // lacking the duration info, we need to parse another subtitle
-                // event.
-                microdvd->last_pkt = *pkt;
-                res = AVERROR(EAGAIN);
+        if (i < 3) {
+            int frame;
+            double fps;
+            char c;
+
+            i++;
+            if ((sscanf(line, "{%d}{}%6lf",    &frame, &fps) == 2 ||
+                 sscanf(line, "{%d}{%*d}%6lf", &frame, &fps) == 2)
+                && frame <= 1 && fps > 3 && fps < 100)
+                pts_info = av_d2q(fps, 100000);
+            if (!st->codec->extradata && sscanf(line, "{DEFAULT}{}%c", &c) == 1) {
+                st->codec->extradata = av_strdup(line + 11);
+                if (!st->codec->extradata)
+                    return AVERROR(ENOMEM);
+                st->codec->extradata_size = strlen(st->codec->extradata) + 1;
+                continue;
             }
         }
+        sub = ff_subtitles_queue_insert(&microdvd->q, line, len, 0);
+        if (!sub)
+            return AVERROR(ENOMEM);
+        sub->pos = pos;
+        sub->pts = get_pts(sub->data);
+        sub->duration = get_duration(sub->data);
     }
-    return res;
+    ff_subtitles_queue_finalize(&microdvd->q);
+    avpriv_set_pts_info(st, 64, pts_info.den, pts_info.num);
+    st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
+    st->codec->codec_id   = CODEC_ID_MICRODVD;
+    return 0;
+}
+
+static int microdvd_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    MicroDVDContext *microdvd = s->priv_data;
+    return ff_subtitles_queue_read_packet(&microdvd->q, pkt);
+}
+
+static int microdvd_read_close(AVFormatContext *s)
+{
+    MicroDVDContext *microdvd = s->priv_data;
+    ff_subtitles_queue_clean(&microdvd->q);
+    return 0;
 }
 
 AVInputFormat ff_microdvd_demuxer = {
@@ -172,5 +140,6 @@ AVInputFormat ff_microdvd_demuxer = {
     .read_probe     = microdvd_probe,
     .read_header    = microdvd_read_header,
     .read_packet    = microdvd_read_packet,
+    .read_close     = microdvd_read_close,
     .flags          = AVFMT_GENERIC_INDEX,
 };