mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-09-20 02:50:16 +00:00
Code Issues 1 Projects Releases Wiki Activity
gstreamer/gst/mpeg1sys/buffer.c
David Schleef bb23b9a3a2 Fix a bunch of endianness conversions that were done as long instead of int32. Should go into 0.6.1. 
Original commit message from CVS:

Fix a bunch of endianness conversions that were done as long instead of
int32.  Should go into 0.6.1.
2003-04-07 18:43:25 +00:00

484 lines
16 KiB
C
Raw Blame History

/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library 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.
*/
#include <string.h>
#include <gst/gst.h>
#include <gst/getbits/getbits.h>
#include "buffer.h"
#define SEQUENCE_HEADER 0x000001b3
#define SEQUENCE_END 0x000001b7
#define PICTURE_START 0x00000100
#define GROUP_START 0x000001b8
#define SYNCWORD_START 0x000001
#define AUDIO_SYNCWORD 0xfff
#define CLOCKS 90000.0
#define DEBUG(a, b...) g_print (##b)
/* This must match decoder and encoder tables */
static double picture_rates [16] =
{
0.0,
24000.0/1001.,
24.0,
25.0,
30000.0/1001.,
30.0,
50.0,
60000.0/1001.,
60.0,
1,
5,
10,
12,
15,
0,
0
};
/* defined but not used
static double ratio [16] = { 0., 1., 0.6735, 0.7031, 0.7615, 0.8055,
0.8437, 0.8935, 0.9157, 0.9815, 1.0255, 1.0695, 1.0950, 1.1575,
1.2015, 0.};
*/
#ifdef GST_DEBUG_ENABLED
static char picture_types [4][3] =
{ "I", "P", "B", "D" };
#endif
static int bitrate_index[2][3][16] =
{ { {0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448, },
{0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384, },
{0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, } },
{ {0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256, },
{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, },
{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, } },
};
static long frequency[9] =
{44100, 48000, 32000, 22050, 24000, 16000, 11025, 12000, 8000};
static double dfrequency[9] =
{44.1, 48, 32, 22.05, 24, 16, 11.025, 12, 8};
static unsigned int samples [4] = {192, 384, 1152, 1152};
/* deined but not used
static char mode [4][15] =
{ "stereo", "joint stereo", "dual channel", "single channel" };
static char copyright [2][20] =
{ "no copyright","copyright protected" };
static char original [2][10] =
{ "copy","original" };
static char emphasis [4][20] =
{ "none", "50/15 microseconds", "reserved", "CCITT J.17" };
*/
static void mpeg1mux_buffer_update_video_info(Mpeg1MuxBuffer *mb);
static void mpeg1mux_buffer_update_audio_info(Mpeg1MuxBuffer *mb);
Mpeg1MuxBuffer *mpeg1mux_buffer_new(guchar type, guchar id) {
Mpeg1MuxBuffer *new = g_malloc(sizeof(Mpeg1MuxBuffer));
new->buffer = NULL;
new->length = 0;
new->base = 0;
new->buffer_type = type;
new->stream_id = id;
new->scan_pos = 0;
new->new_frame = TRUE;
new->current_start = 0;
new->timecode_list = NULL;
new->queued_list = NULL;
new->next_frame_time = 0;
return new;
}
void mpeg1mux_buffer_queue(Mpeg1MuxBuffer *mb, GstBuffer *buf) {
if (mb->buffer == NULL) {
mb->buffer = g_malloc(GST_BUFFER_SIZE(buf));
mb->length = GST_BUFFER_SIZE(buf);
memcpy(mb->buffer, GST_BUFFER_DATA(buf), GST_BUFFER_SIZE(buf));
}
else {
mb->buffer = g_realloc(mb->buffer, mb->length + GST_BUFFER_SIZE(buf));
memcpy(mb->buffer+mb->length, GST_BUFFER_DATA(buf), GST_BUFFER_SIZE(buf));
mb->length += GST_BUFFER_SIZE(buf);
}
GST_DEBUG (0,"queuing buffer %lu", mb->length);
if (mb->buffer_type == BUFFER_TYPE_VIDEO) {
mpeg1mux_buffer_update_video_info(mb);
}
else {
mpeg1mux_buffer_update_audio_info(mb);
}
}
gulong mpeg1mux_buffer_update_queued(Mpeg1MuxBuffer *mb, guint64 scr) {
GList *queued_list;
Mpeg1MuxTimecode *tc;
gulong total_queued = 0;
GST_DEBUG (0,"queued in buffer on SCR=%" G_GUINT64_FORMAT, scr);
queued_list = g_list_first(mb->queued_list);
while (queued_list) {
tc = (Mpeg1MuxTimecode *) queued_list->data;
if (tc->DTS < scr) {
/* this buffer should be sent out */
mb->queued_list = g_list_remove(mb->queued_list, tc);
queued_list = g_list_first(mb->queued_list);
}
else {
GST_DEBUG (0,"queued in buffer %ld, %" G_GUINT64_FORMAT, tc->original_length, tc->DTS);
total_queued += tc->original_length;
queued_list = g_list_next(queued_list);
}
}
GST_DEBUG (0,"queued in buffer %lu", total_queued);
return total_queued;
}
void mpeg1mux_buffer_shrink(Mpeg1MuxBuffer *mb, gulong size) {
GList *timecode_list;
Mpeg1MuxTimecode *tc;
gulong consumed = 0;
gulong count;
GST_DEBUG (0,"shrinking buffer %lu", size);
g_assert(mb->length >= size);
memcpy(mb->buffer, mb->buffer+size, mb->length-size);
mb->buffer = g_realloc(mb->buffer, mb->length-size);
mb->length -= size;
mb->scan_pos -= size;
mb->current_start -= size;
timecode_list = g_list_first(mb->timecode_list);
tc = (Mpeg1MuxTimecode *) timecode_list->data;
if (tc->length > size) {
tc->length -= size;
mb->new_frame = FALSE;
}
else {
consumed += tc->length;
while (size >= consumed) {
GST_DEBUG (0,"removing timecode: %" G_GUINT64_FORMAT " %" G_GUINT64_FORMAT " %lu %lu", tc->DTS, tc->PTS, tc->length, consumed);
mb->timecode_list = g_list_remove_link(mb->timecode_list, timecode_list);
mb->queued_list = g_list_append(mb->queued_list, tc);
timecode_list = g_list_first(mb->timecode_list);
tc = (Mpeg1MuxTimecode *) timecode_list->data;
consumed += tc->length;
GST_DEBUG (0,"next timecode: %" G_GUINT64_FORMAT " %" G_GUINT64_FORMAT " %lu %lu", tc->DTS, tc->PTS, tc->length, consumed);
}
mb->new_frame = TRUE;
GST_DEBUG (0,"leftover frame size from %lu to %lu ", tc->length, consumed-size);
tc->length = consumed - size;
}
if (mb->buffer_type == BUFFER_TYPE_VIDEO) {
mb->info.video.DTS = tc->DTS;
mb->info.video.PTS = tc->PTS;
mb->next_frame_time = tc->DTS;
}
else {
mb->info.audio.PTS = tc->PTS;
mb->next_frame_time = tc->PTS;
}
GST_DEBUG (0,"next frame time timecode: %" G_GUINT64_FORMAT " %lu", mb->next_frame_time, tc->length);
/* check buffer consistency */
timecode_list = g_list_first(mb->timecode_list);
count = 0;
while (timecode_list) {
tc = (Mpeg1MuxTimecode *) timecode_list->data;
count += tc->length;
timecode_list = g_list_next(timecode_list);
}
if (count != mb->current_start) g_print("********** error %lu != %lu\n", count, mb->current_start);
mb->base += size;
}
static void mpeg1mux_buffer_update_video_info(Mpeg1MuxBuffer *mb) {
gboolean have_sync = FALSE;
guchar *data = mb->buffer;
gulong offset = mb->scan_pos;
guint sync_zeros = 0;
gulong id=0;
guint temporal_reference, temp;
gst_getbits_t gb;
GST_DEBUG (0,"mpeg1mux::update_video_info %lu %lu", mb->base, mb->scan_pos);
if (mb->base == 0 && mb->scan_pos == 0) {
if ((SYNCWORD_START<<8)+*(mb->buffer+3) == SEQUENCE_HEADER) {
gst_getbits_init(&gb, NULL, NULL);
gst_getbits_newbuf(&gb, data+4, mb->length);
mb->info.video.horizontal_size = gst_getbits12(&gb);
mb->info.video.vertical_size = gst_getbits12(&gb);
mb->info.video.aspect_ratio = gst_getbits4(&gb);
mb->info.video.picture_rate = gst_getbits4(&gb);
mb->info.video.bit_rate = gst_getbits18(&gb);
if (gst_getbits1(&gb) != 1) {
g_print("mpeg1mux::update_video_info: marker bit error\n");
}
mb->info.video.vbv_buffer_size = gst_getbits10(&gb);
mb->info.video.CSPF = gst_getbits1(&gb);
mb->info.video.secs_per_frame = 1. / picture_rates[mb->info.video.picture_rate];
mb->info.video.decoding_order=0;
mb->info.video.group_order=0;
GST_DEBUG (0,"mpeg1mux::update_video_info: secs per frame %g", mb->info.video.secs_per_frame);
}
else {
g_print("mpeg1mux::update_video_info: Invalid MPEG Video header\n");
}
}
while (offset < mb->length-6) {
if (!have_sync) {
guchar byte = *(data+offset);
/*GST_DEBUG (0,"mpeg1mux::update_video_info: found #%d at %lu",byte,offset); */
offset++;
/* if it's zero, increment the zero count */
if (byte == 0) {
sync_zeros++;
/*GST_DEBUG (0,"mpeg1mux::update_video_info: found zero #%d at %lu",sync_zeros,offset-1); */
}
/* if it's a one and we have two previous zeros, we have sync */
else if ((byte == 1) && (sync_zeros >= 2)) {
GST_DEBUG (0,"mpeg1mux::update_video_info: synced at %lu",offset-1);
have_sync = TRUE;
sync_zeros = 0;
}
/* if it's anything else, we've lost it completely */
else sync_zeros = 0;
/* then snag the chunk ID */
} else if (id == 0) {
id = *(data+offset);
GST_DEBUG (0,"mpeg1mux::update_video_info: got id 0x%02lX",id);
id = (SYNCWORD_START<<8)+id;
switch (id) {
case SEQUENCE_HEADER:
GST_DEBUG (0,"mpeg1mux::update_video_info: sequence header");
break;
case GROUP_START:
GST_DEBUG (0,"mpeg1mux::update_video_info: group start");
mb->info.video.group_order=0;
break;
case PICTURE_START:
/* skip the first access unit */
if (mb->info.video.decoding_order != 0) {
Mpeg1MuxTimecode *tc;
GST_DEBUG (0,"mpeg1mux::update_video_info: PTS %" G_GUINT64_FORMAT ", DTS %" G_GUINT64_FORMAT ", length %lu", mb->info.video.current_PTS,
mb->info.video.current_DTS, offset - mb->current_start-3);
tc = (Mpeg1MuxTimecode *) g_malloc(sizeof(Mpeg1MuxTimecode));
tc->length = offset - mb->current_start-3;
tc->original_length = tc->length;
tc->frame_type = mb->info.video.current_type;
tc->DTS = mb->info.video.current_DTS;
tc->PTS = mb->info.video.current_PTS;
mb->timecode_list = g_list_append(mb->timecode_list, tc);
if (mb->info.video.decoding_order == 0) {
mb->next_frame_time = tc->DTS;
}
mb->current_start = offset-3;
}
temp= (*(data+offset+1)<<8)+*(data+offset+2);
temporal_reference = (temp & 0xffc0) >> 6;
mb->info.video.current_type = (temp & 0x0038) >> 3;
GST_DEBUG (0,"mpeg1mux::update_video_info: picture start temporal_ref:%d type:%s Frame", temporal_reference,
picture_types[mb->info.video.current_type-1]);
mb->info.video.current_DTS = mb->info.video.decoding_order * mb->info.video.secs_per_frame * CLOCKS;
mb->info.video.current_PTS = (temporal_reference - mb->info.video.group_order + 1 +
mb->info.video.decoding_order) *mb->info.video.secs_per_frame*CLOCKS;
mb->info.video.decoding_order++;
mb->info.video.group_order++;
offset++;
break;
case SEQUENCE_END:
GST_DEBUG (0,"mpeg1mux::update_video_info: sequence end");
break;
}
/* prepare for next sync */
offset++;
have_sync = FALSE;
id = 0;
sync_zeros = 0;
}
}
mb->scan_pos = offset;
}
static void mpeg1mux_buffer_update_audio_info(Mpeg1MuxBuffer *mb) {
guchar *data = mb->buffer;
gulong offset = mb->scan_pos;
guint32 id=0;
guint padding_bit;
gst_getbits_t gb;
guint startup_delay = 0;
int layer_index,lsf,samplerate_index,padding;
long bpf;
Mpeg1MuxTimecode *tc;
GST_DEBUG (0,"mpeg1mux::update_audio_info %lu %lu", mb->base, mb->scan_pos);
if (mb->base == 0 && mb->scan_pos == 0) {
id = GUINT32_FROM_BE(*((guint32 *)(data)));
printf("MPEG audio id = %08x\n", (unsigned int)id);
if ((id & 0xfff00000) == AUDIO_SYNCWORD<<20) {
/* mpegver = (header >> 19) & 0x3; don't need this for bpf */
layer_index = (id >> 17) & 0x3;
mb->info.audio.layer = 4 - layer_index;
lsf = (id & (1 << 20)) ? ((id & (1 << 19)) ? 0 : 1) : 1;
mb->info.audio.bit_rate = bitrate_index[lsf][mb->info.audio.layer - 1][((id >> 12) & 0xf)];
samplerate_index = (id >> 10) & 0x3;
padding = (id >> 9) & 0x1;
if (mb->info.audio.layer == 1) {
bpf = mb->info.audio.bit_rate * 12000;
bpf /= frequency[samplerate_index];
bpf = ((bpf + padding) << 2);
} else {
bpf = mb->info.audio.bit_rate * 144000;
bpf /= frequency[samplerate_index];
bpf += padding;
}
mb->info.audio.framesize = bpf;
GST_DEBUG (0,"mpeg1mux::update_audio_info: samples per second %d", samplerate_index);
gst_getbits_init(&gb, NULL, NULL);
gst_getbits_newbuf(&gb, data, mb->length);
gst_flushbitsn(&gb, 12);
if (gst_getbits1(&gb) != 1) {
g_print("mpeg1mux::update_audio_info: marker bit error\n");
}
gst_flushbitsn(&gb, 2);
mb->info.audio.protection = gst_getbits1(&gb);
gst_flushbitsn(&gb, 4);
mb->info.audio.frequency = gst_getbits2(&gb);
padding_bit = gst_getbits1(&gb);
gst_flushbitsn(&gb, 1);
mb->info.audio.mode = gst_getbits2(&gb);
mb->info.audio.mode_extension = gst_getbits2(&gb);
mb->info.audio.copyright = gst_getbits1(&gb);
mb->info.audio.original_copy = gst_getbits1(&gb);
mb->info.audio.emphasis = gst_getbits2(&gb);
GST_DEBUG (0,"mpeg1mux::update_audio_info: layer %d", mb->info.audio.layer);
GST_DEBUG (0,"mpeg1mux::update_audio_info: bit_rate %d", mb->info.audio.bit_rate);
GST_DEBUG (0,"mpeg1mux::update_audio_info: frequency %d", mb->info.audio.frequency);
mb->info.audio.samples_per_second = (double)dfrequency [mb->info.audio.frequency];
GST_DEBUG (0,"mpeg1mux::update_audio_info: samples per second %g", mb->info.audio.samples_per_second);
mb->info.audio.decoding_order=0;
tc = (Mpeg1MuxTimecode *) g_malloc(sizeof(Mpeg1MuxTimecode));
tc->length = mb->info.audio.framesize;
tc->original_length = tc->length;
tc->frame_type = FRAME_TYPE_AUDIO;
mb->info.audio.current_PTS = mb->info.audio.decoding_order * samples [mb->info.audio.layer] /
mb->info.audio.samples_per_second * 90. + startup_delay;
GST_DEBUG (0,"mpeg1mux::update_audio_info: PTS %" G_GUINT64_FORMAT ", length %u", mb->info.audio.current_PTS, mb->info.audio.framesize);
tc->PTS = mb->info.audio.current_PTS;
tc->DTS = mb->info.audio.current_PTS;
mb->timecode_list = g_list_append(mb->timecode_list, tc);
mb->next_frame_time = tc->PTS;
mb->info.audio.decoding_order++;
offset += tc->length;
}
else {
g_print("mpeg1mux::update_audio_info: Invalid MPEG Video header\n");
}
}
while (offset < mb->length-4) {
id = GUINT32_FROM_BE(*((guint32 *)(data+offset)));
/* mpegver = (header >> 19) & 0x3; don't need this for bpf */
layer_index = (id >> 17) & 0x3;
mb->info.audio.layer = 4 - layer_index;
lsf = (id & (1 << 20)) ? ((id & (1 << 19)) ? 0 : 1) : 1;
mb->info.audio.bit_rate = bitrate_index[lsf][mb->info.audio.layer - 1][((id >> 12) & 0xf)];
samplerate_index = (id >> 10) & 0x3;
padding = (id >> 9) & 0x1;
if (mb->info.audio.layer == 1) {
bpf = mb->info.audio.bit_rate * 12000;
bpf /= frequency[samplerate_index];
bpf = ((bpf + padding) << 2);
} else {
bpf = mb->info.audio.bit_rate * 144000;
bpf /= frequency[samplerate_index];
bpf += padding;
}
tc = (Mpeg1MuxTimecode *) g_malloc(sizeof(Mpeg1MuxTimecode));
tc->length = bpf;
tc->original_length = tc->length;
tc->frame_type = FRAME_TYPE_AUDIO;
mb->current_start = offset + bpf;
mb->info.audio.samples_per_second = (double)dfrequency [mb->info.audio.frequency];
mb->info.audio.current_PTS = (mb->info.audio.decoding_order * samples [mb->info.audio.layer]) /
mb->info.audio.samples_per_second * 90. ;
tc->DTS = tc->PTS = mb->info.audio.current_PTS;
GST_DEBUG (0,"mpeg1mux::update_audio_info: PTS %" G_GUINT64_FORMAT ", %" G_GUINT64_FORMAT " length %lu", mb->info.audio.current_PTS, tc->PTS, tc->length);
mb->timecode_list = g_list_append(mb->timecode_list, tc);
mb->info.audio.decoding_order++;
offset += tc->length;
}
mb->scan_pos = offset;
}
Reference in a new issue View git blame Copy permalink