--- /dev/null
+/* Concatenate elementary streams */
+/* Mpeg3cat is useful for extracting elementary streams from program streams. */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include "libzmpeg3.h"
+
+#define BUFFER_SIZE 0x100000
+
+unsigned char *output_buffer = 0;
+int64_t output_buffer_size = 0;
+int64_t output_scan_offset = 0;
+FILE *out = 0;
+int got_start = 0;
+int do_audio = 0;
+int do_video = 0;
+
+// Check for first start code before writing out
+static int write_output(unsigned char *data, int size, zmpeg3_t *file)
+{
+// Already got start code so write data directly
+// Or user doesn't want to extract an elementary stream
+ if( got_start || (!do_audio && !do_video) || file->is_bd() ) {
+ return fwrite(data, size, 1, out);
+ }
+ else {
+// Buffer until start code
+ uint32_t zcode = 0xffffffff;
+ int new_allocation = output_buffer_size + size;
+ unsigned char *new_output_buffer = new unsigned char[new_allocation];
+ memcpy(new_output_buffer, output_buffer, output_buffer_size);
+ memcpy(new_output_buffer + output_buffer_size, data, size);
+ if( output_buffer ) delete [] output_buffer;
+ output_buffer = new_output_buffer;
+ output_buffer_size = new_allocation;
+
+ if( output_buffer_size >= 4 ) {
+ if( do_video ) {
+ while( output_scan_offset < output_buffer_size && !got_start ) {
+ zcode = (zcode << 8) | output_buffer[output_scan_offset++];
+ if( zcode == zmpeg3_t::SEQUENCE_START_CODE ) {
+ got_start = 1;
+ }
+ }
+
+ output_scan_offset -= 4;
+ }
+ else {
+// Only scan for AC3 start code since we can't scan for mp2 start codes.
+// It must occur in the first 2048 bytes or we give up.
+ while( output_scan_offset < output_buffer_size &&
+ output_scan_offset < 2048 && !got_start ) {
+ zcode = ((zcode & 0xff) << 8) | output_buffer[output_scan_offset++];
+ if( zcode == zmpeg3_t::AC3_START_CODE ) {
+ got_start = 1;
+ }
+ }
+
+ if( got_start )
+ output_scan_offset -= 2;
+ else if( output_scan_offset >= 2048 ) {
+ output_scan_offset = 0;
+ got_start = 1;
+ }
+ else
+ output_scan_offset -= 2;
+ }
+
+ if( got_start ) {
+ return fwrite(output_buffer + output_scan_offset,
+ output_buffer_size - output_scan_offset, 1, out);
+ }
+ }
+ }
+
+ return 1;
+}
+
+int main(int argc, char *argv[])
+{
+ char inpath[1024], outpath[1024], newpath[1024];
+ char *inpaths[argc];
+ int total_infiles = 0;
+ zmpeg3_t *in;
+ int out_counter = 0;
+ int current_file, current_output_file = 0, i;
+ unsigned char buffer[BUFFER_SIZE];
+ long output_size;
+ int result = 0;
+ int64_t total_frames = 0;
+ int stream = 0;
+ int64_t total_written = 0;
+
+ if( argc < 2 ) {
+ fprintf(stderr, "Concatenate elementary streams or demultiplex a program stream.\n"
+ "Usage: mpeg3cat -[av0123456789] <infile> [infile...] > <outfile>\n\n"
+ "Example: Concatenate 2 video files: mpeg3cat xena1.m2v xena2.m2v > xena.m2v\n"
+ " Extract audio stream 0: mpeg3cat -a0 xena.vob > war_cry.ac3\n");
+ exit(1);
+ }
+
+ outpath[0] = 0;
+ for( i=1; i < argc; ++i ) {
+ if( argv[i][0] == '-' ) {
+ if( argv[i][1] != 'a' && argv[i][1] != 'v' && argv[i][1] != 'o' ) {
+ fprintf(stderr, "invalid option %s\n", argv[i]);
+ exit(1);
+ }
+ else
+ if( argv[i][1] == 'o' ) {
+// Check for filename
+ if( i < argc - 1 ) {
+ strcpy(outpath, argv[++i]);
+ }
+ else {
+ fprintf(stderr, "-o requires an output file\n");
+ exit(1);
+ }
+
+// Check if file exists
+ if( (out = fopen(outpath, "r")) ) {
+ fprintf(stderr, "%s exists.\n", outpath);
+ exit(1);
+ }
+ }
+ else {
+ if( argv[i][1] == 'a' ) do_audio = 1;
+ else if( argv[i][1] == 'v' ) do_video = 1;
+ if( argv[i][2] != 0 ) {
+ stream = argv[i][2] - '0';
+ }
+ }
+ }
+ else {
+ inpaths[total_infiles++] = argv[i];
+ }
+ }
+
+ if( outpath[0] ) {
+ if( !(out = fopen(outpath, "wb")) ) {
+ fprintf(stderr, "Failed to open %s for writing\n", outpath);
+ exit(1);
+ }
+ }
+ else
+ out = stdout;
+
+ for( current_file=0; current_file < total_infiles; ++current_file ) {
+ strcpy(inpath, inpaths[current_file]);
+ int error = 0;
+ if( !(in = mpeg3_open(inpath, &error)) ) {
+ fprintf(stderr, "Skipping %s\n", inpath);
+ continue;
+ }
+
+/* output elementary audio stream */
+ if( (mpeg3_has_audio(in) && in->is_audio_stream() ) ||
+ (do_audio && !in->is_audio_stream() && !in->is_video_stream())) {
+ do_audio = 1;
+/* Add audio stream to end */
+ if( stream >= in->total_astreams() ) {
+ fprintf(stderr, "No audio stream %d\n", stream);
+ exit(1);
+ }
+
+ in->atrack[stream]->demuxer->seek_byte(zmpeg3_t::START_BYTE);
+// in->atrack[stream]->audio->astream->refill();
+//printf("mpeg3cat 1\n");
+ while( !mpeg3_read_audio_chunk(in, buffer,
+ &output_size, BUFFER_SIZE, stream) ) {
+//printf("mpeg3cat 2 0x%x\n", output_size);
+ result = !write_output(buffer, output_size, in);
+ if( result ) {
+ perror("write audio chunk");
+ break;
+ }
+ }
+//printf("mpeg3cat 3\n");
+ }
+/* Output elementary video stream */
+ else if( (mpeg3_has_video(in) && in->is_video_stream()) ||
+ (do_video && !in->is_video_stream() && !in->is_audio_stream())) {
+/* Add video stream to end */
+ int64_t hour, minute, second, frame;
+ uint32_t zcode;
+ float carry;
+ int i, offset;
+
+ if( stream >= in->total_vstreams() ) {
+ fprintf(stderr, "No video stream %d\n", stream);
+ exit(1);
+ }
+
+ in->vtrack[stream]->demuxer->seek_byte(zmpeg3_t::START_BYTE);
+ in->vtrack[stream]->video->vstream->refill();
+ do_video = 1;
+ while( !mpeg3_read_video_chunk(in, buffer, &output_size,
+ BUFFER_SIZE, stream) && output_size >= 4 ) {
+ zcode = (uint32_t)buffer[output_size - 4] << 24;
+ zcode |= (uint32_t)buffer[output_size - 3] << 16;
+ zcode |= (uint32_t)buffer[output_size - 2] << 8;
+ zcode |= (uint32_t)buffer[output_size - 1];
+
+/* Got a frame at the end of this buffer. */
+ if( zcode == zmpeg3_t::PICTURE_START_CODE ) {
+ total_frames++;
+ }
+ else if( zcode == zmpeg3_t::SEQUENCE_END_CODE ) {
+/* Got a sequence end code at the end of this buffer. */
+ output_size -= 4;
+ }
+
+ zcode = (uint32_t)buffer[0] << 24;
+ zcode |= (uint32_t)buffer[1] << 16;
+ zcode |= (uint32_t)buffer[2] << 8;
+ zcode |= buffer[3];
+
+ i = 0;
+ offset = 0;
+ if( zcode == zmpeg3_t::SEQUENCE_START_CODE && current_output_file > 0 ) {
+/* Skip the sequence start code */
+ i += 4;
+ while( i < output_size && zcode != zmpeg3_t::GOP_START_CODE ) {
+ zcode <<= 8;
+ zcode |= buffer[i++];
+ }
+ i -= 4;
+ offset = i;
+ }
+
+/* Search for GOP header to fix */
+ zcode = (uint32_t)buffer[i++] << 24;
+ zcode |= (uint32_t)buffer[i++] << 16;
+ zcode |= (uint32_t)buffer[i++] << 8;
+ zcode |= buffer[i++];
+ while( i < output_size && zcode != zmpeg3_t::GOP_START_CODE ) {
+ zcode <<= 8;
+ zcode |= buffer[i++];
+ }
+
+ if( zcode == zmpeg3_t::GOP_START_CODE ) {
+/* Get the time code */
+ zcode = (uint32_t)buffer[i] << 24;
+ zcode |= (uint32_t)buffer[i + 1] << 16;
+ zcode |= (uint32_t)buffer[i + 2] << 8;
+ zcode |= (uint32_t)buffer[i + 3];
+
+ hour = zcode >> 26 & 0x1f;
+ minute = zcode >> 20 & 0x3f;
+ second = zcode >> 13 & 0x3f;
+ frame = zcode >> 7 & 0x3f;
+
+/* int64_t gop_frame = (int64_t)(hour * 3600 * mpeg3_frame_rate(in, stream) +
+ minute * 60 * mpeg3_frame_rate(in, stream) +
+ second * mpeg3_frame_rate(in, stream) +
+ frame); */
+/* fprintf(stderr, "old: %02d:%02d:%02d:%02d ", hour, minute, second, frame); */
+/* Write a new time code */
+ hour = (int64_t)((float)(total_frames - 1) / mpeg3_frame_rate(in, stream) / 3600);
+ carry = hour * 3600 * mpeg3_frame_rate(in, stream);
+ minute = (int64_t)((float)(total_frames - 1 - carry) / mpeg3_frame_rate(in, stream) / 60);
+ carry += minute * 60 * mpeg3_frame_rate(in, stream);
+ second = (int64_t)((float)(total_frames - 1 - carry) / mpeg3_frame_rate(in, stream));
+ carry += second * mpeg3_frame_rate(in, stream);
+ frame = (total_frames - 1 - carry);
+
+ buffer[i] = ((zcode >> 24) & 0x80) | (hour << 2) | (minute >> 4);
+ buffer[i + 1] = ((zcode >> 16) & 0x08) | ((minute & 0xf) << 4) | (second >> 3);
+ buffer[i + 2] = ((second & 0x7) << 5) | (frame >> 1);
+ buffer[i + 3] = (zcode & 0x7f) | ((frame & 0x1) << 7);
+/* fprintf(stderr, "new: %02d:%02d:%02d:%02d\n", hour, minute, second, frame); */
+ }
+
+
+/* Test 32 bit overflow */
+ if( outpath[0] ) {
+ if( ftell(out) > 0x7f000000 ) {
+ fclose(out);
+ out_counter++;
+ sprintf(newpath, "%s%03d", outpath, out_counter);
+ if( !(out = fopen(newpath, "wb")) ) {
+ fprintf(stderr, "Couldn't open %s for writing.\n", newpath);
+ exit(1);
+ }
+ }
+ }
+/*
+ * fprintf(stderr, "mpeg3cat 5 %02x %02x %02x %02x\n",
+ * (buffer + offset)[0],
+ * (buffer + offset)[1],
+ * (buffer + offset)[2],
+ * (buffer + offset)[3]);
+ */
+
+/* Write the frame */
+ result = !write_output(buffer + offset, output_size - offset, in);
+ if( result ) {
+ perror("write video chunk");
+ break;
+ }
+ }
+ }
+ else
+/* Output program stream */
+/* In real life, program streams ended up having discontinuities in time codes */
+/* so this isn't being maintained anymore. */
+ if( in->is_program_stream() ) {
+ zdemuxer_t *demuxer = in->vtrack[0]->demuxer;
+ result = 0;
+
+/* Append program stream with no changes */
+ demuxer->read_all = 1;
+ demuxer->seek_byte(zmpeg3_t::START_BYTE);
+
+ while( !result ) {
+ result = demuxer->seek_phys();
+ if( !result ) {
+ demuxer->zdata.size = 0;
+ demuxer->zvideo.size = 0;
+ demuxer->zaudio.size = 0;
+ result = demuxer->read_program();
+ if( result )
+ fprintf(stderr, "Hit end of data in %s\n", inpath);
+ }
+
+
+// Read again and decrypt it
+ unsigned char raw_data[0x10000];
+ int raw_size = 0;
+ if( !result ) {
+ ztitle_t *title = demuxer->titles[demuxer->current_title];
+ int64_t temp_offset = title->fs->tell();
+ int64_t decryption_offset =
+ demuxer->last_packet_decryption - demuxer->last_packet_start;
+ raw_size = demuxer->last_packet_end - demuxer->last_packet_start;
+
+ title->fs->seek(demuxer->last_packet_start);
+ title->fs->read_data(raw_data, raw_size);
+ title->fs->seek(temp_offset);
+
+ if( decryption_offset > 0 &&
+ decryption_offset < raw_size &&
+ raw_data[decryption_offset] & 0x30 ) {
+ if( title->fs->css.decrypt_packet(raw_data, 0) ) {
+ fprintf(stderr, "get_ps_pes_packet: Decryption not available\n");
+ return 1;
+ }
+ raw_data[decryption_offset] &= 0xcf;
+ }
+ }
+
+// Write it
+ if( !result ) {
+ result = !write_output(raw_data, raw_size, in);
+ total_written += raw_size;
+ if( result) fprintf(stderr, "write program stream: %s\n", strerror(errno) );
+ }
+ }
+ }
+ else {
+/* No transport stream support, since these can be catted */
+ fprintf(stderr, "No catting of transport streams.\n");
+ mpeg3_close(in);
+ in = 0;
+ continue;
+ }
+
+ mpeg3_close(in);
+ in = 0;
+ current_output_file++;
+ }
+
+#ifdef TODO
+/* Terminate output */
+ if( current_output_file > 0 && do_video ) {
+/* Write new end of sequence */
+/* Not very useful */
+ buffer[0] = (zmpeg3_t::SEQUENCE_END_CODE >> 24) & 0xff;
+ buffer[1] = (zmpeg3_t::SEQUENCE_END_CODE >> 16) & 0xff;
+ buffer[2] = (zmpeg3_t::SEQUENCE_END_CODE >> 8) & 0xff;
+ buffer[3] = (zmpeg3_t::SEQUENCE_END_CODE >> 0) & 0xff;
+ result = !write_output(buffer, 4, in);
+ }
+#endif
+ if( outpath[0]) fclose(out );
+ exit(0);
+}
+
projects / goodguy / history.git / blobdiff