mirror of
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144 lines
4.1 KiB
C
144 lines
4.1 KiB
C
/* Gnome-Streamer
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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 <stdlib.h>
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#include <gstriff.h>
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GstRiff *gst_riff_new() {
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GstRiff *riff;
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riff = (GstRiff *)malloc(sizeof(GstRiff));
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g_return_val_if_fail(riff != NULL, NULL);
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riff->form = 0;
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riff->chunks = NULL;
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riff->state = 0;
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riff->curoffset = 0;
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riff->nextlikely = 0;
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return riff;
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}
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gint gst_riff_next_buffer(GstRiff *riff,GstBuffer *buf,gulong off) {
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gulong last;
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GstRiffChunk *chunk;
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g_return_val_if_fail(riff != NULL, 0);
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g_return_val_if_fail(buf != NULL, 0);
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g_return_val_if_fail(GST_BUFFER_DATA(buf) != NULL, 0);
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last = off + GST_BUFFER_SIZE(buf);
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if (off == 0) {
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gulong *words = (gulong *)GST_BUFFER_DATA(buf);
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/* verify this is a valid RIFF file, first of all */
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if (words[0] != gst_riff_fourcc_to_id("RIFF")) {
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riff->state = GST_RIFF_ENOTRIFF;
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return riff->state;
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}
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riff->form = words[2];
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// g_print("form is 0x%08x '%s'\n",words[2],gst_riff_id_to_fourcc(words[2]));
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riff->nextlikely = 12; /* skip 'RIFF', length, and form */
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}
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/* loop while the next likely chunk header is in this buffer */
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while ((riff->nextlikely+8) < last) {
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gulong *words = (gulong *)((guchar *)GST_BUFFER_DATA(buf) + riff->nextlikely);
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// g_print("next likely chunk is at offset 0x%08x\n",riff->nextlikely);
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chunk = (GstRiffChunk *)malloc(sizeof(GstRiffChunk));
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g_return_val_if_fail(chunk != NULL,0);
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chunk->offset = riff->nextlikely+8; /* point to the actual data */
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chunk->id = words[0];
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chunk->size = words[1];
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// g_print("chunk id is 0x%08x '%s' and is 0x%08x long\n",words[0],
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// gst_riff_id_to_fourcc(words[0]),words[1]);
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riff->nextlikely += 8 + chunk->size; /* doesn't include hdr */
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riff->chunks = g_list_prepend(riff->chunks,chunk);
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}
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return 0;
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}
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gulong gst_riff_fourcc_to_id(gchar *fourcc) {
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g_return_val_if_fail(fourcc != NULL,0);
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return (fourcc[0] << 0) | (fourcc[1] << 8) |
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(fourcc[2] << 16) | (fourcc[3] << 24);
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}
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gchar *gst_riff_id_to_fourcc(gulong id) {
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gchar *fourcc = (gchar *)malloc(5);
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g_return_val_if_fail(fourcc != NULL, NULL);
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fourcc[0] = (id >> 0) & 0xff;
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fourcc[1] = (id >> 8) & 0xff;
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fourcc[2] = (id >> 16) & 0xff;
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fourcc[3] = (id >> 24) & 0xff;
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fourcc[4] = 0;
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return fourcc;
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}
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GList *gst_riff_get_chunk_list(GstRiff *riff) {
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g_return_val_if_fail(riff != NULL, NULL);
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return riff->chunks;
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}
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GstRiffChunk *gst_riff_get_chunk(GstRiff *riff,gchar *fourcc) {
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GList *chunk;
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g_return_val_if_fail(riff != NULL, NULL);
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g_return_val_if_fail(fourcc != NULL, NULL);
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chunk = riff->chunks;
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while (chunk) {
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if (((GstRiffChunk *)(chunk->data))->id == gst_riff_fourcc_to_id(fourcc))
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return (GstRiffChunk *)(chunk->data);
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chunk = g_list_next(chunk);
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}
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return NULL;
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}
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gulong gst_riff_get_nextlikely(GstRiff *riff) {
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g_return_val_if_fail(riff != NULL, 0);
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return riff->nextlikely;
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}
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/*
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guchar *hchar = (guchar *)(buf->data);
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gulong hlong = *(gulong *)(buf->data);
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g_print("header is 0x%08x native, %02x %02x %02x %02x, '%c%c%c%c'\n",
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hlong,
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hchar[0],hchar[1],hchar[2],hchar[3],
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hchar[0],hchar[1],hchar[2],hchar[3]);
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g_print("header 0x%08x translates to '%s'\n",hlong,
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gst_riff_id_to_fourcc(hlong));
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g_print("header 0x%08x trancodes to 0x%08x\n",hlong,
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gst_riff_fourcc_to_id(gst_riff_id_to_fourcc(hlong)));
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*/
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