diff options
| -rw-r--r-- | src/demuxers/demux_yuv4mpeg2.c | 33 |
1 files changed, 30 insertions, 3 deletions
diff --git a/src/demuxers/demux_yuv4mpeg2.c b/src/demuxers/demux_yuv4mpeg2.c index afc31a4d3..74e9a375d 100644 --- a/src/demuxers/demux_yuv4mpeg2.c +++ b/src/demuxers/demux_yuv4mpeg2.c @@ -22,7 +22,7 @@ * tools, visit: * http://mjpeg.sourceforge.net/ * - * $Id: demux_yuv4mpeg2.c,v 1.1 2002/10/04 05:05:58 tmmm Exp $ + * $Id: demux_yuv4mpeg2.c,v 1.2 2002/10/05 17:48:25 tmmm Exp $ */ #ifdef HAVE_CONFIG_H @@ -323,6 +323,9 @@ static int demux_yuv4mpeg2_open(demux_plugin_t *this_gen, input_plugin_t *input, return DEMUX_CANNOT_HANDLE; } +static int demux_yuv4mpeg2_seek (demux_plugin_t *this_gen, + off_t start_pos, int start_time); + static int demux_yuv4mpeg2_start (demux_plugin_t *this_gen, off_t start_pos, int start_time) { @@ -330,6 +333,8 @@ static int demux_yuv4mpeg2_start (demux_plugin_t *this_gen, buf_element_t *buf; int err; + demux_yuv4mpeg2_seek(this_gen, start_pos, start_time); + pthread_mutex_lock(&this->mutex); /* if thread is not running, initialize demuxer */ @@ -377,7 +382,26 @@ static int demux_yuv4mpeg2_start (demux_plugin_t *this_gen, static int demux_yuv4mpeg2_seek (demux_plugin_t *this_gen, off_t start_pos, int start_time) { - return 0; + demux_yuv4mpeg2_t *this = (demux_yuv4mpeg2_t *) this_gen; + int status; + + /* YUV4MPEG2 files are essentially constant bit-rate video. Seek along + * the calculated frame boundaries. Divide the requested seek offset + * by the frame size integer-wise to obtain the desired frame number + * and then multiply the frame number by the frame size to get the + * starting offset. Add the data_start offset to obtain the final + * offset. */ + + start_pos /= (this->frame_size + Y4M_FRAME_SIGNATURE_SIZE); + start_pos *= (this->frame_size + Y4M_FRAME_SIGNATURE_SIZE); + start_pos += this->data_start; + + this->input->seek(this->input, start_pos, SEEK_SET); + status = this->status = DEMUX_OK; + xine_demux_flush_engine (this->xine); + pthread_mutex_unlock(&this->mutex); + + return status; } static void demux_yuv4mpeg2_stop (demux_plugin_t *this_gen) { @@ -422,7 +446,10 @@ static char *demux_yuv4mpeg2_get_id(void) { static int demux_yuv4mpeg2_get_stream_length (demux_plugin_t *this_gen) { - return 0; + demux_yuv4mpeg2_t *this = (demux_yuv4mpeg2_t *) this_gen; + + return (this->data_size / (this->frame_size + Y4M_FRAME_SIGNATURE_SIZE) / + this->fps); } static char *demux_yuv4mpeg2_get_mimetypes(void) { |