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210 lines
7 KiB
C
210 lines
7 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 <gstriff.h>
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//#define debug(format,args...) g_print(format,##args)
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#define debug(format,args...)
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GstRiff *gst_riff_parser_new(GstRiffCallback function, gpointer data) {
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GstRiff *riff;
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riff = (GstRiff *)g_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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riff->new_tag_found = function;
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riff->callback_data = data;
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riff->incomplete_chunk = NULL;
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riff->dataleft = NULL;
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return riff;
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}
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gint gst_riff_parser_next_buffer(GstRiff *riff,GstBuffer *buf,gulong off) {
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gulong last, size;
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GstRiffChunk *chunk;
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g_return_val_if_fail(riff != NULL, GST_RIFF_EINVAL);
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g_return_val_if_fail(buf != NULL, GST_RIFF_EINVAL);
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g_return_val_if_fail(GST_BUFFER_DATA(buf) != NULL, GST_RIFF_EINVAL);
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size = GST_BUFFER_SIZE(buf);
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last = off + size;
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debug("gst_riff_parser: offset new buffer 0x%08lx size 0x%08x\n", off, GST_BUFFER_SIZE(buf));
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if (riff->dataleft) {
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gulong newsize;
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debug("gst_riff_parser: recovering left data\n");
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newsize = riff->dataleft_size + size;
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riff->dataleft = g_realloc(riff->dataleft, newsize);
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memcpy(riff->dataleft+riff->dataleft_size, GST_BUFFER_DATA(buf), size);
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gst_buffer_unref(buf);
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buf = gst_buffer_new();
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GST_BUFFER_DATA(buf) = riff->dataleft;
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GST_BUFFER_SIZE(buf) = newsize;
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off -= riff->dataleft_size;
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//last -= riff->dataleft_size;
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riff->dataleft = NULL;
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}
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if (off == 0) {
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gulong *words = (gulong *)GST_BUFFER_DATA(buf);
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// don't even try to parse the head if it's not there FIXME
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if (last < 12) {
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riff->state = GST_RIFF_ENOTRIFF;
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return riff->state;
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}
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//g_print("testing is 0x%08lx '%s'\n",words[0],gst_riff_id_to_fourcc(words[0]));
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/* verify this is a valid RIFF file, first of all */
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if (words[0] != GST_RIFF_TAG_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%08lx '%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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// all OK here
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riff->incomplete_chunk = NULL;
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}
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// if we have an incomplete chunk from the previous buffer
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if (riff->incomplete_chunk) {
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guint leftover;
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debug("gst_riff_parser: have incomplete chunk %08x filled\n", riff->incomplete_chunk_size);
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leftover = riff->incomplete_chunk->size - riff->incomplete_chunk_size;
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if (leftover <= size) {
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debug("gst_riff_parser: we can fill it from %08x with %08x bytes = %08x\n",
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riff->incomplete_chunk_size, leftover,
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riff->incomplete_chunk_size+leftover);
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memcpy(riff->incomplete_chunk->data+riff->incomplete_chunk_size, GST_BUFFER_DATA(buf), leftover);
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if (riff->new_tag_found) {
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riff->new_tag_found(riff->incomplete_chunk, riff->callback_data);
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}
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g_free(riff->incomplete_chunk->data);
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g_free(riff->incomplete_chunk);
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riff->incomplete_chunk = NULL;
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}
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else {
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debug("gst_riff_parser: we cannot fill it %08x >= %08lx\n", leftover, size);
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memcpy(riff->incomplete_chunk->data+riff->incomplete_chunk_size, GST_BUFFER_DATA(buf), size);
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riff->incomplete_chunk_size += size;
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return 0;
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}
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}
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if ((riff->nextlikely+12) > last) {
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guint left = last - riff->nextlikely;
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debug("gst_riff_parser: not enough data next 0x%08x last 0x%08lx %08x %08x\n",riff->nextlikely,
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last, left, off);
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riff->dataleft = g_malloc(left);
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riff->dataleft_size = left;
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memcpy(riff->dataleft, GST_BUFFER_DATA(buf)+size-left, left);
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return 0;
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}
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debug("gst_riff_parser: next 0x%08x last 0x%08lx offset %08x\n",riff->nextlikely, last, off);
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/* loop while the next likely chunk header is in this buffer */
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while ((riff->nextlikely+12) <= last) {
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gulong *words = (gulong *)((guchar *)GST_BUFFER_DATA(buf) + riff->nextlikely - off );
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// loop over all of the chunks to check which one is finished
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while (riff->chunks) {
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chunk = g_list_nth_data(riff->chunks, 0);
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debug("gst_riff_parser: next 0x%08x offset 0x%08lx size 0x%08x\n",riff->nextlikely,
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chunk->offset, chunk->size);
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if (riff->nextlikely >= chunk->offset+chunk->size) {
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debug("gst_riff_parser: found END LIST\n");
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// we have the end of the chunk on the stack, remove it
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riff->chunks = g_list_remove(riff->chunks, chunk);
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}
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else break;
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}
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debug("gst_riff_parser: next likely chunk is at offset 0x%08x\n",riff->nextlikely);
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chunk = (GstRiffChunk *)g_malloc(sizeof(GstRiffChunk));
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g_return_val_if_fail(chunk != NULL, GST_RIFF_ENOMEM);
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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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chunk->data = (gchar *)(words+2);
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// we need word alignment
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//if (chunk->size & 0x01) chunk->size++;
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chunk->form = words[2]; /* fill in the form, might not be valid */
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if (chunk->id == GST_RIFF_TAG_LIST) {
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//g_print("found LIST %s\n", gst_riff_id_to_fourcc(chunk->form));
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riff->nextlikely += 12;
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// we push the list chunk on our 'stack'
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riff->chunks = g_list_prepend(riff->chunks,chunk);
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// send the buffer to the listener if we have received a function
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if (riff->new_tag_found) {
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riff->new_tag_found(chunk, riff->callback_data);
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}
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}
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else {
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debug("gst_riff_parser: chunk id offset %08x is 0x%08lx '%s' and is 0x%08lx long\n",
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riff->nextlikely, 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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// if this buffer is incomplete
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if (riff->nextlikely > last) {
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guint left = size - (riff->nextlikely - chunk->size - off);
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//g_print("make incomplete buffer %08x\n", left);
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chunk->data = g_malloc(chunk->size);
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memcpy(chunk->data, (gchar *)(words+2), left);
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riff->incomplete_chunk = chunk;
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riff->incomplete_chunk_size = left;
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}
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else {
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// send the buffer to the listener if we have received a function
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if (riff->new_tag_found) {
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riff->new_tag_found(chunk, riff->callback_data);
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}
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g_free(chunk);
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}
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//riff->chunks = g_list_prepend(riff->chunks,chunk);
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}
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}
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return 0;
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}
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