*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file sierravmd.c
* Sierra VMD file demuxer
* by Vladimir "VAG" Gneushev (vagsoft at mail.ru)
+ * for more information on the Sierra VMD file format, visit:
+ * http://www.pcisys.net/~melanson/codecs/
*/
#include "avformat.h"
-#define LE_16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
-#define LE_32(x) ((((uint8_t*)(x))[3] << 24) | \
- (((uint8_t*)(x))[2] << 16) | \
- (((uint8_t*)(x))[1] << 8) | \
- ((uint8_t*)(x))[0])
-
#define VMD_HEADER_SIZE 0x0330
#define BYTES_PER_FRAME_RECORD 16
vmd_frame_t *frame_table;
unsigned int current_frame;
+ int sample_rate;
+ int64_t audio_sample_counter;
+ int audio_frame_divisor;
+ int audio_block_align;
+
unsigned char vmd_header[VMD_HEADER_SIZE];
} VmdDemuxContext;
return AVPROBE_SCORE_MAX / 2;
}
+/* This is a support function to determine the duration, in sample
+ * frames, of a particular audio chunk, taking into account silent
+ * encodings. */
+static int vmd_calculate_audio_duration(unsigned char *audio_chunk,
+ int audio_chunk_size, int block_align)
+{
+ unsigned char *p = audio_chunk + 16;
+ unsigned char *p_end = audio_chunk + audio_chunk_size;
+ int total_samples = 0;
+ unsigned int sound_flags;
+
+ if (audio_chunk_size < 16)
+ return 0;
+
+ sound_flags = LE_32(p);
+ p += 4;
+ while (p < p_end) {
+ total_samples += block_align;
+ if ((sound_flags & 0x01) == 0)
+ p += block_align;
+ sound_flags >>= 1;
+ }
+
+ return total_samples;
+}
+
static int vmd_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
unsigned char *current_frame_record;
offset_t current_offset;
int i;
- int sample_rate;
unsigned int total_frames;
-int video_frame_count = 0;
+ int64_t video_pts_inc;
+ int64_t current_video_pts = 0;
/* fetch the main header, including the 2 header length bytes */
url_fseek(pb, 0, SEEK_SET);
if (get_buffer(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE)
- return -EIO;
+ return AVERROR_IO;
+
+ vmd->audio_sample_counter = 0;
+ vmd->audio_frame_divisor = 1;
+ vmd->audio_block_align = 1;
/* start up the decoders */
st = av_new_stream(s, 0);
if (!st)
return AVERROR_NOMEM;
+ av_set_pts_info(st, 33, 1, 90000);
vmd->video_stream_index = st->index;
- st->codec.codec_type = CODEC_TYPE_VIDEO;
- st->codec.codec_id = CODEC_ID_VMDVIDEO;
- st->codec.codec_tag = 0; /* no fourcc */
- st->codec.width = LE_16(&vmd->vmd_header[12]);
- st->codec.height = LE_16(&vmd->vmd_header[14]);
- st->codec.extradata_size = VMD_HEADER_SIZE;
- st->codec.extradata = av_malloc(VMD_HEADER_SIZE);
- memcpy(st->codec.extradata, vmd->vmd_header, VMD_HEADER_SIZE);
+ st->codec->codec_type = CODEC_TYPE_VIDEO;
+ st->codec->codec_id = CODEC_ID_VMDVIDEO;
+ st->codec->codec_tag = 0; /* no fourcc */
+ st->codec->width = LE_16(&vmd->vmd_header[12]);
+ st->codec->height = LE_16(&vmd->vmd_header[14]);
+ st->codec->extradata_size = VMD_HEADER_SIZE;
+ st->codec->extradata = av_mallocz(VMD_HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
+ memcpy(st->codec->extradata, vmd->vmd_header, VMD_HEADER_SIZE);
/* if sample rate is 0, assume no audio */
- sample_rate = LE_16(&vmd->vmd_header[804]);
- if (sample_rate) {
+ vmd->sample_rate = LE_16(&vmd->vmd_header[804]);
+ if (vmd->sample_rate) {
st = av_new_stream(s, 0);
if (!st)
return AVERROR_NOMEM;
+ av_set_pts_info(st, 33, 1, 90000);
vmd->audio_stream_index = st->index;
- st->codec.codec_type = CODEC_TYPE_AUDIO;
- st->codec.codec_id = CODEC_ID_VMDAUDIO;
- st->codec.codec_tag = 0; /* no codec tag */
- st->codec.channels = (vmd->vmd_header[811] & 0x80) ? 2 : 1;
- st->codec.sample_rate = sample_rate;
- st->codec.bit_rate = st->codec.sample_rate *
- st->codec.bits_per_sample * st->codec.channels;
- st->codec.block_align = LE_16(&vmd->vmd_header[806]);
- if (st->codec.block_align & 0x8000) {
- st->codec.bits_per_sample = 16;
- st->codec.block_align = -(st->codec.block_align - 0x10000);
+ st->codec->codec_type = CODEC_TYPE_AUDIO;
+ st->codec->codec_id = CODEC_ID_VMDAUDIO;
+ st->codec->codec_tag = 0; /* no codec tag */
+ st->codec->channels = (vmd->vmd_header[811] & 0x80) ? 2 : 1;
+ st->codec->sample_rate = vmd->sample_rate;
+ st->codec->block_align = vmd->audio_block_align =
+ LE_16(&vmd->vmd_header[806]);
+ if (st->codec->block_align & 0x8000) {
+ st->codec->bits_per_sample = 16;
+ st->codec->block_align = -(st->codec->block_align - 0x10000);
} else
- st->codec.bits_per_sample = 8;
+ st->codec->bits_per_sample = 16;
+// st->codec->bits_per_sample = 8;
+ st->codec->bit_rate = st->codec->sample_rate *
+ st->codec->bits_per_sample * st->codec->channels;
+
+ /* for calculating pts */
+ vmd->audio_frame_divisor = st->codec->bits_per_sample / 8 /
+ st->codec->channels;
+
+ video_pts_inc = 90000;
+ video_pts_inc *= st->codec->block_align;
+ video_pts_inc /= st->codec->sample_rate;
+ } else {
+ /* if no audio, assume 10 frames/second */
+ video_pts_inc = 90000 / 10;
}
- /* skip over the offset table and load the table of contents; don't
- * care about the offset table since demuxer will calculate those
+ /* skip over the offset table and load the table of contents; don't
+ * care about the offset table since demuxer will calculate those
* independently */
toc_offset = LE_32(&vmd->vmd_header[812]);
vmd->frame_count = LE_16(&vmd->vmd_header[6]);
/* each on-disk VMD frame has an audio part and a video part; demuxer
* accounts them separately */
- vmd->frame_count *= 2;
+ if(vmd->sample_rate)
+ vmd->frame_count *= 2;
raw_frame_table = NULL;
vmd->frame_table = NULL;
raw_frame_table_size = vmd->frame_count * BYTES_PER_FRAME_RECORD;
av_free(vmd->frame_table);
return AVERROR_NOMEM;
}
- if (get_buffer(pb, raw_frame_table, raw_frame_table_size) !=
+ if (get_buffer(pb, raw_frame_table, raw_frame_table_size) !=
raw_frame_table_size) {
av_free(raw_frame_table);
av_free(vmd->frame_table);
- return -EIO;
+ return AVERROR_IO;
}
current_offset = LE_32(&vmd->vmd_header[20]);
/* if the frame size is 0, do not count the frame and bring the
* total frame count down */
- vmd->frame_table[i].frame_size = LE_32(¤t_frame_record[2]);
+ // note, we limit the size to 1Gb to ensure that we dont end up overflowing the size integer used to allocate the memory
+ vmd->frame_table[i].frame_size = LE_32(¤t_frame_record[2]) & 0x3FFFFFFF;
/* this logic is present so that 0-length audio chunks are not
* accounted */
memcpy(vmd->frame_table[i].frame_record, current_frame_record,
BYTES_PER_FRAME_RECORD);
-if (current_frame_record[0] == 0x02) {
- /* assume 15 fps for now */
- vmd->frame_table[i].pts = video_frame_count++;
- vmd->frame_table[i].pts *= 90000;
- vmd->frame_table[i].pts /= 15;
-}
+ /* figure out the pts for this frame */
+ if (current_frame_record[0] == 0x02) {
+ vmd->frame_table[i].pts = current_video_pts;
+ current_video_pts += video_pts_inc;
+ } else if (current_frame_record[0] == 0x01) {
+ /* figure out the pts during the dispatch phase */
+ vmd->frame_table[i].pts = 0;
+ }
current_frame_record += BYTES_PER_FRAME_RECORD;
i++;
av_free(raw_frame_table);
- /* set the pts reference at 1 pts = 1/90000 sec */
- s->pts_num = 1;
- s->pts_den = 90000;
-
vmd->current_frame = 0;
return 0;
vmd_frame_t *frame;
if (vmd->current_frame >= vmd->frame_count)
- return -EIO;
+ return AVERROR_IO;
frame = &vmd->frame_table[vmd->current_frame];
/* position the stream (will probably be there already) */
if (av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD))
return AVERROR_NOMEM;
+ pkt->pos= url_ftell(pb);
memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
- ret = get_buffer(pb, pkt->data + BYTES_PER_FRAME_RECORD,
+ ret = get_buffer(pb, pkt->data + BYTES_PER_FRAME_RECORD,
frame->frame_size);
- if (ret != frame->frame_size)
- ret = -EIO;
+ if (ret != frame->frame_size) {
+ av_free_packet(pkt);
+ ret = AVERROR_IO;
+ }
pkt->stream_index = frame->stream_index;
- pkt->pts = frame->pts;
+ if (frame->frame_record[0] == 0x02)
+ pkt->pts = frame->pts;
+ else {
+ pkt->pts = vmd->audio_sample_counter;
+ pkt->pts *= 90000;
+ pkt->pts /= vmd->sample_rate;
+// pkt->pts /= vmd->audio_frame_divisor;
+ vmd->audio_sample_counter += vmd_calculate_audio_duration(
+ pkt->data, pkt->size, vmd->audio_block_align);
+
+ }
+av_log(NULL, AV_LOG_INFO, " dispatching %s frame with %d bytes and pts %"PRId64" (%0.1f sec)\n",
+ (frame->frame_record[0] == 0x02) ? "video" : "audio",
+ frame->frame_size + BYTES_PER_FRAME_RECORD,
+ pkt->pts, (float)(pkt->pts / 90000.0));
vmd->current_frame++;
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