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482 lines
16 KiB
C
482 lines
16 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <string.h>
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/*#define DEBUG_ENABLED */
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#include <gst/gst.h>
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#include <gst/getbits/getbits.h>
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#include "buffer.h"
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#define SEQUENCE_HEADER 0x000001b3
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#define SEQUENCE_END 0x000001b7
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#define PICTURE_START 0x00000100
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#define GROUP_START 0x000001b8
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#define SYNCWORD_START 0x000001
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#define AUDIO_SYNCWORD 0xfff
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#define CLOCKS 90000.0
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#define DEBUG(a, b...) g_print (##b)
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/* This must match decoder and encoder tables */
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static double picture_rates [16] =
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{
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0.0,
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24000.0/1001.,
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24.0,
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25.0,
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30000.0/1001.,
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30.0,
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50.0,
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60000.0/1001.,
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60.0,
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1,
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5,
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10,
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12,
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15,
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0,
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0
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};
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static double ratio [16] = { 0., 1., 0.6735, 0.7031, 0.7615, 0.8055,
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0.8437, 0.8935, 0.9157, 0.9815, 1.0255, 1.0695, 1.0950, 1.1575,
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1.2015, 0.};
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static char picture_types [4][3] =
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{ "I", "P", "B", "D" };
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static int bitrate_index[2][3][16] =
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{ { {0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448, },
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{0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384, },
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{0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, } },
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{ {0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256, },
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{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, },
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{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, } },
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};
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static long frequency[9] =
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{44100, 48000, 32000, 22050, 24000, 16000, 11025, 12000, 8000};
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static double dfrequency[9] =
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{44.1, 48, 32, 22.05, 24, 16, 11.025, 12, 8};
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static unsigned int samples [4] = {192, 384, 1152, 1152};
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static char mode [4][15] =
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{ "stereo", "joint stereo", "dual channel", "single channel" };
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static char copyright [2][20] =
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{ "no copyright","copyright protected" };
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static char original [2][10] =
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{ "copy","original" };
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static char emphasis [4][20] =
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{ "none", "50/15 microseconds", "reserved", "CCITT J.17" };
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static void mpeg1mux_buffer_update_video_info(Mpeg1MuxBuffer *mb);
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static void mpeg1mux_buffer_update_audio_info(Mpeg1MuxBuffer *mb);
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Mpeg1MuxBuffer *mpeg1mux_buffer_new(guchar type, guchar id) {
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Mpeg1MuxBuffer *new = g_malloc(sizeof(Mpeg1MuxBuffer));
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new->buffer = NULL;
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new->length = 0;
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new->base = 0;
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new->buffer_type = type;
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new->stream_id = id;
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new->scan_pos = 0;
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new->new_frame = TRUE;
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new->current_start = 0;
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new->timecode_list = NULL;
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new->queued_list = NULL;
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new->next_frame_time = 0;
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return new;
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}
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void mpeg1mux_buffer_queue(Mpeg1MuxBuffer *mb, GstBuffer *buf) {
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if (mb->buffer == NULL) {
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mb->buffer = g_malloc(GST_BUFFER_SIZE(buf));
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mb->length = GST_BUFFER_SIZE(buf);
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memcpy(mb->buffer, GST_BUFFER_DATA(buf), GST_BUFFER_SIZE(buf));
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}
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else {
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mb->buffer = g_realloc(mb->buffer, mb->length + GST_BUFFER_SIZE(buf));
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memcpy(mb->buffer+mb->length, GST_BUFFER_DATA(buf), GST_BUFFER_SIZE(buf));
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mb->length += GST_BUFFER_SIZE(buf);
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}
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GST_DEBUG (0,"queuing buffer %lu\n", mb->length);
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if (mb->buffer_type == BUFFER_TYPE_VIDEO) {
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mpeg1mux_buffer_update_video_info(mb);
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}
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else {
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mpeg1mux_buffer_update_audio_info(mb);
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}
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}
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gulong mpeg1mux_buffer_update_queued(Mpeg1MuxBuffer *mb, guint64 scr) {
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GList *queued_list;
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Mpeg1MuxTimecode *tc;
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gulong total_queued = 0;
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GST_DEBUG (0,"queued in buffer on SCR=%llu\n", scr);
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queued_list = g_list_first(mb->queued_list);
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while (queued_list) {
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tc = (Mpeg1MuxTimecode *) queued_list->data;
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if (tc->DTS < scr) {
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/* this buffer should be sent out */
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mb->queued_list = g_list_remove(mb->queued_list, tc);
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queued_list = g_list_first(mb->queued_list);
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}
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else {
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GST_DEBUG (0,"queued in buffer %ld, %llu\n", tc->original_length, tc->DTS);
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total_queued += tc->original_length;
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queued_list = g_list_next(queued_list);
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}
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}
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GST_DEBUG (0,"queued in buffer %lu\n", total_queued);
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return total_queued;
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}
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void mpeg1mux_buffer_shrink(Mpeg1MuxBuffer *mb, gulong size) {
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GList *timecode_list;
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Mpeg1MuxTimecode *tc;
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gulong consumed = 0;
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gulong count;
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GST_DEBUG (0,"shrinking buffer %lu\n", size);
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g_assert(mb->length >= size);
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memcpy(mb->buffer, mb->buffer+size, mb->length-size);
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mb->buffer = g_realloc(mb->buffer, mb->length-size);
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mb->length -= size;
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mb->scan_pos -= size;
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mb->current_start -= size;
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timecode_list = g_list_first(mb->timecode_list);
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tc = (Mpeg1MuxTimecode *) timecode_list->data;
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if (tc->length > size) {
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tc->length -= size;
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mb->new_frame = FALSE;
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}
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else {
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consumed += tc->length;
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while (size >= consumed) {
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GST_DEBUG (0,"removing timecode: %llu %llu %lu %lu\n", tc->DTS, tc->PTS, tc->length, consumed);
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mb->timecode_list = g_list_remove_link(mb->timecode_list, timecode_list);
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mb->queued_list = g_list_append(mb->queued_list, tc);
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timecode_list = g_list_first(mb->timecode_list);
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tc = (Mpeg1MuxTimecode *) timecode_list->data;
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consumed += tc->length;
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GST_DEBUG (0,"next timecode: %llu %llu %lu %lu\n", tc->DTS, tc->PTS, tc->length, consumed);
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}
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mb->new_frame = TRUE;
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GST_DEBUG (0,"leftover frame size from %lu to %lu \n", tc->length, consumed-size);
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tc->length = consumed - size;
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}
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if (mb->buffer_type == BUFFER_TYPE_VIDEO) {
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mb->info.video.DTS = tc->DTS;
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mb->info.video.PTS = tc->PTS;
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mb->next_frame_time = tc->DTS;
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}
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else {
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mb->info.audio.PTS = tc->PTS;
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mb->next_frame_time = tc->PTS;
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}
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GST_DEBUG (0,"next frame time timecode: %llu %lu\n", mb->next_frame_time, tc->length);
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/* check buffer consistency */
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timecode_list = g_list_first(mb->timecode_list);
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count = 0;
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while (timecode_list) {
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tc = (Mpeg1MuxTimecode *) timecode_list->data;
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count += tc->length;
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timecode_list = g_list_next(timecode_list);
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}
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if (count != mb->current_start) g_print("********** error %lu != %lu\n", count, mb->current_start);
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mb->base += size;
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}
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static void mpeg1mux_buffer_update_video_info(Mpeg1MuxBuffer *mb) {
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gboolean have_sync = FALSE;
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guchar *data = mb->buffer;
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gulong offset = mb->scan_pos;
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guint sync_zeros = 0;
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gulong id=0;
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guint temporal_reference, temp;
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gst_getbits_t gb;
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GST_DEBUG (0,"mpeg1mux::update_video_info %lu %lu\n", mb->base, mb->scan_pos);
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if (mb->base == 0 && mb->scan_pos == 0) {
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if ((SYNCWORD_START<<8)+*(mb->buffer+3) == SEQUENCE_HEADER) {
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gst_getbits_init(&gb, NULL, NULL);
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gst_getbits_newbuf(&gb, data+4, mb->length);
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mb->info.video.horizontal_size = gst_getbits12(&gb);
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mb->info.video.vertical_size = gst_getbits12(&gb);
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mb->info.video.aspect_ratio = gst_getbits4(&gb);
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mb->info.video.picture_rate = gst_getbits4(&gb);
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mb->info.video.bit_rate = gst_getbits18(&gb);
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if (gst_getbits1(&gb) != 1) {
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g_print("mpeg1mux::update_video_info: marker bit error\n");
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}
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mb->info.video.vbv_buffer_size = gst_getbits10(&gb);
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mb->info.video.CSPF = gst_getbits1(&gb);
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mb->info.video.secs_per_frame = 1. / picture_rates[mb->info.video.picture_rate];
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mb->info.video.decoding_order=0;
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mb->info.video.group_order=0;
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GST_DEBUG (0,"mpeg1mux::update_video_info: secs per frame %g\n", mb->info.video.secs_per_frame);
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}
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else {
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g_print("mpeg1mux::update_video_info: Invalid MPEG Video header\n");
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}
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}
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while (offset < mb->length-6) {
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if (!have_sync) {
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guchar byte = *(data+offset);
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/*GST_DEBUG (0,"mpeg1mux::update_video_info: found #%d at %lu\n",byte,offset); */
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offset++;
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/* if it's zero, increment the zero count */
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if (byte == 0) {
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sync_zeros++;
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/*GST_DEBUG (0,"mpeg1mux::update_video_info: found zero #%d at %lu\n",sync_zeros,offset-1); */
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}
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/* if it's a one and we have two previous zeros, we have sync */
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else if ((byte == 1) && (sync_zeros >= 2)) {
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GST_DEBUG (0,"mpeg1mux::update_video_info: synced at %lu\n",offset-1);
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have_sync = TRUE;
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sync_zeros = 0;
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}
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/* if it's anything else, we've lost it completely */
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else sync_zeros = 0;
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/* then snag the chunk ID */
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} else if (id == 0) {
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id = *(data+offset);
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GST_DEBUG (0,"mpeg1mux::update_video_info: got id 0x%02lX\n",id);
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id = (SYNCWORD_START<<8)+id;
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switch (id) {
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case SEQUENCE_HEADER:
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GST_DEBUG (0,"mpeg1mux::update_video_info: sequence header\n");
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break;
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case GROUP_START:
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GST_DEBUG (0,"mpeg1mux::update_video_info: group start\n");
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mb->info.video.group_order=0;
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break;
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case PICTURE_START:
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/* skip the first access unit */
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if (mb->info.video.decoding_order != 0) {
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Mpeg1MuxTimecode *tc;
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GST_DEBUG (0,"mpeg1mux::update_video_info: PTS %llu, DTS %llu, length %lu\n", mb->info.video.current_PTS,
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mb->info.video.current_DTS, offset - mb->current_start-3);
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tc = (Mpeg1MuxTimecode *) g_malloc(sizeof(Mpeg1MuxTimecode));
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tc->length = offset - mb->current_start-3;
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tc->original_length = tc->length;
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tc->frame_type = mb->info.video.current_type;
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tc->DTS = mb->info.video.current_DTS;
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tc->PTS = mb->info.video.current_PTS;
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mb->timecode_list = g_list_append(mb->timecode_list, tc);
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if (mb->info.video.decoding_order == 0) {
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mb->next_frame_time = tc->DTS;
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}
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mb->current_start = offset-3;
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}
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temp= (*(data+offset+1)<<8)+*(data+offset+2);
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temporal_reference = (temp & 0xffc0) >> 6;
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mb->info.video.current_type = (temp & 0x0038) >> 3;
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GST_DEBUG (0,"mpeg1mux::update_video_info: picture start temporal_ref:%d type:%s Frame\n", temporal_reference,
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picture_types[mb->info.video.current_type-1]);
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mb->info.video.current_DTS = mb->info.video.decoding_order * mb->info.video.secs_per_frame * CLOCKS;
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mb->info.video.current_PTS = (temporal_reference - mb->info.video.group_order + 1 +
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mb->info.video.decoding_order) *mb->info.video.secs_per_frame*CLOCKS;
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mb->info.video.decoding_order++;
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mb->info.video.group_order++;
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offset++;
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break;
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case SEQUENCE_END:
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GST_DEBUG (0,"mpeg1mux::update_video_info: sequence end\n");
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break;
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}
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/* prepare for next sync */
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offset++;
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have_sync = FALSE;
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id = 0;
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sync_zeros = 0;
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}
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}
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mb->scan_pos = offset;
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}
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static void mpeg1mux_buffer_update_audio_info(Mpeg1MuxBuffer *mb) {
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guchar *data = mb->buffer;
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gulong offset = mb->scan_pos;
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gulong id=0;
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guint padding_bit;
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gst_getbits_t gb;
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guint startup_delay = 0;
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int layer_index,lsf,samplerate_index,padding;
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long bpf;
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Mpeg1MuxTimecode *tc;
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GST_DEBUG (0,"mpeg1mux::update_audio_info %lu %lu\n", mb->base, mb->scan_pos);
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if (mb->base == 0 && mb->scan_pos == 0) {
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id = GULONG_FROM_BE(*((gulong *)(data)));
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printf("MPEG audio id = %08lx\n", id);
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if ((id & 0xfff00000) == AUDIO_SYNCWORD<<20) {
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/* mpegver = (header >> 19) & 0x3; don't need this for bpf */
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layer_index = (id >> 17) & 0x3;
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mb->info.audio.layer = 4 - layer_index;
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lsf = (id & (1 << 20)) ? ((id & (1 << 19)) ? 0 : 1) : 1;
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mb->info.audio.bit_rate = bitrate_index[lsf][mb->info.audio.layer - 1][((id >> 12) & 0xf)];
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samplerate_index = (id >> 10) & 0x3;
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padding = (id >> 9) & 0x1;
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if (mb->info.audio.layer == 1) {
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bpf = mb->info.audio.bit_rate * 12000;
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bpf /= frequency[samplerate_index];
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bpf = ((bpf + padding) << 2);
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} else {
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bpf = mb->info.audio.bit_rate * 144000;
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bpf /= frequency[samplerate_index];
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bpf += padding;
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}
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mb->info.audio.framesize = bpf;
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GST_DEBUG (0,"mpeg1mux::update_audio_info: samples per second %d\n", samplerate_index);
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gst_getbits_init(&gb, NULL, NULL);
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gst_getbits_newbuf(&gb, data, mb->length);
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gst_flushbitsn(&gb, 12);
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if (gst_getbits1(&gb) != 1) {
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g_print("mpeg1mux::update_audio_info: marker bit error\n");
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}
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gst_flushbitsn(&gb, 2);
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mb->info.audio.protection = gst_getbits1(&gb);
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gst_flushbitsn(&gb, 4);
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mb->info.audio.frequency = gst_getbits2(&gb);
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padding_bit = gst_getbits1(&gb);
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gst_flushbitsn(&gb, 1);
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mb->info.audio.mode = gst_getbits2(&gb);
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mb->info.audio.mode_extension = gst_getbits2(&gb);
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mb->info.audio.copyright = gst_getbits1(&gb);
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mb->info.audio.original_copy = gst_getbits1(&gb);
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mb->info.audio.emphasis = gst_getbits2(&gb);
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GST_DEBUG (0,"mpeg1mux::update_audio_info: layer %d\n", mb->info.audio.layer);
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GST_DEBUG (0,"mpeg1mux::update_audio_info: bit_rate %d\n", mb->info.audio.bit_rate);
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GST_DEBUG (0,"mpeg1mux::update_audio_info: frequency %d\n", mb->info.audio.frequency);
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mb->info.audio.samples_per_second = (double)dfrequency [mb->info.audio.frequency];
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GST_DEBUG (0,"mpeg1mux::update_audio_info: samples per second %g\n", mb->info.audio.samples_per_second);
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mb->info.audio.decoding_order=0;
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tc = (Mpeg1MuxTimecode *) g_malloc(sizeof(Mpeg1MuxTimecode));
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tc->length = mb->info.audio.framesize;
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tc->original_length = tc->length;
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tc->frame_type = FRAME_TYPE_AUDIO;
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mb->info.audio.current_PTS = mb->info.audio.decoding_order * samples [mb->info.audio.layer] /
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mb->info.audio.samples_per_second * 90. + startup_delay;
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GST_DEBUG (0,"mpeg1mux::update_audio_info: PTS %llu, length %u\n", mb->info.audio.current_PTS, mb->info.audio.framesize);
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tc->PTS = mb->info.audio.current_PTS;
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tc->DTS = mb->info.audio.current_PTS;
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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 = GULONG_FROM_BE(*((gulong *)(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 %llu, %llu length %lu\n", 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;
|
|
}
|