static void print_file(AVFilterContext *ctx, const char *msg, ...)
{
MetadataContext *s = ctx->priv;
va_list argument_list;
va_start(argument_list, msg);
if (msg) {
char buf[128];
vsnprintf(buf, sizeof(buf), msg, argument_list);
avio_write(s->avio_context, buf, av_strnlen(buf, sizeof(buf)));
}
va_end(argument_list);
}
static int wc3_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
Wc3DemuxContext *wc3 = s->priv_data;
AVIOContext *pb = s->pb;
unsigned int fourcc_tag;
unsigned int size;
int packet_read = 0;
int ret = 0;
unsigned char text[1024];
while (!packet_read) {
fourcc_tag = avio_rl32(pb);
/* chunk sizes are 16-bit aligned */
size = (avio_rb32(pb) + 1) & (~1);
if (avio_feof(pb))
return AVERROR(EIO);
switch (fourcc_tag) {
case BRCH_TAG:
/* no-op */
break;
case SHOT_TAG:
/* load up new palette */
avio_seek(pb, -8, SEEK_CUR);
av_append_packet(pb, &wc3->vpkt, 8 + 4);
break;
case VGA__TAG:
/* send out video chunk */
avio_seek(pb, -8, SEEK_CUR);
ret= av_append_packet(pb, &wc3->vpkt, 8 + size);
// ignore error if we have some data
if (wc3->vpkt.size > 0)
ret = 0;
*pkt = wc3->vpkt;
wc3->vpkt.data = NULL; wc3->vpkt.size = 0;
pkt->stream_index = wc3->video_stream_index;
pkt->pts = wc3->pts;
packet_read = 1;
break;
case TEXT_TAG:
/* subtitle chunk */
if ((unsigned)size > sizeof(text) || (ret = avio_read(pb, text, size)) != size)
ret = AVERROR(EIO);
else {
int i = 0;
av_log (s, AV_LOG_DEBUG, "Subtitle time!\n");
if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1)
return AVERROR_INVALIDDATA;
av_log (s, AV_LOG_DEBUG, " inglish: %s\n", &text[i + 1]);
i += text[i] + 1;
if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1)
return AVERROR_INVALIDDATA;
av_log (s, AV_LOG_DEBUG, " doytsch: %s\n", &text[i + 1]);
i += text[i] + 1;
if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1)
return AVERROR_INVALIDDATA;
av_log (s, AV_LOG_DEBUG, " fronsay: %s\n", &text[i + 1]);
}
break;
case AUDI_TAG:
/* send out audio chunk */
ret= av_get_packet(pb, pkt, size);
pkt->stream_index = wc3->audio_stream_index;
pkt->pts = wc3->pts;
/* time to advance pts */
wc3->pts++;
packet_read = 1;
break;
default:
av_log(s, AV_LOG_ERROR, "unrecognized WC3 chunk: %s\n",
av_fourcc2str(fourcc_tag));
ret = AVERROR_INVALIDDATA;
packet_read = 1;
break;
}
}
return ret;
}
