gstreamer/gst-libs/gst/riff/riffencode.c

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/* 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>
/*#define DEBUG_ENABLED */
#include "riff.h"
#define GST_RIFF_ENCODER_BUF_SIZE 1024
#define ADD_CHUNK(riffenc, chunkid, chunksize) \
{ \
gst_riff_chunk *chunk;\
chunk = (gst_riff_chunk *)(riffenc->dataleft + riffenc->nextlikely);\
chunk->id = chunkid; \
chunk->size = chunksize; \
riffenc->nextlikely += sizeof(gst_riff_chunk); \
}
#define ADD_LIST(riffenc, listsize, listtype) \
{ \
gst_riff_list *list;\
list = (gst_riff_list *)(riffenc->dataleft + riffenc->nextlikely); \
list->id = GST_RIFF_TAG_LIST; \
list->size = listsize; \
list->type = listtype; \
riffenc->nextlikely += sizeof(gst_riff_list); \
}
GstRiff *gst_riff_encoder_new(guint32 type) {
GstRiff *riff;
gst_riff_list *list;
GST_DEBUG (0,"gst_riff_encoder: making %4.4s encoder", (char *)&type);
riff = (GstRiff *)g_malloc(sizeof(GstRiff));
g_return_val_if_fail(riff != NULL, NULL);
riff->form = 0;
riff->chunks = NULL;
riff->state = GST_RIFF_STATE_INITIAL;
riff->curoffset = 0;
riff->incomplete_chunk = NULL;
riff->dataleft = g_malloc(GST_RIFF_ENCODER_BUF_SIZE);
riff->dataleft_size = GST_RIFF_ENCODER_BUF_SIZE;
riff->nextlikely = 0;
list = (gst_riff_list *)riff->dataleft;
list->id = GST_RIFF_TAG_RIFF;
list->size = 0x00FFFFFF;
list->type = GST_RIFF_RIFF_AVI;
riff->nextlikely += sizeof(gst_riff_list);
return riff;
}
gint gst_riff_encoder_avih(GstRiff *riff, gst_riff_avih *head, gulong size) {
gst_riff_chunk *chunk;
g_return_val_if_fail(riff->state == GST_RIFF_STATE_INITIAL, GST_RIFF_EINVAL);
GST_DEBUG (0,"gst_riff_encoder: add avih");
ADD_LIST(riff, 0xB8, GST_RIFF_LIST_hdrl);
ADD_CHUNK(riff, GST_RIFF_TAG_avih, size);
chunk = (gst_riff_chunk *)(riff->dataleft + riff->nextlikely);
memcpy(chunk, head, size);
riff->nextlikely += size;
riff->state = GST_RIFF_STATE_HASAVIH;
return GST_RIFF_OK;
}
gint gst_riff_encoder_strh(GstRiff *riff, guint32 fcc_type, gst_riff_strh *head, gulong size) {
gst_riff_chunk *chunk;
g_return_val_if_fail(riff->state == GST_RIFF_STATE_HASAVIH ||
riff->state == GST_RIFF_STATE_HASSTRF, GST_RIFF_EINVAL);
GST_DEBUG (0,"gst_riff_encoder: add strh type %08x (%4.4s)", fcc_type, (char *)&fcc_type);
ADD_LIST(riff, 108, GST_RIFF_LIST_strl);
ADD_CHUNK(riff, GST_RIFF_TAG_strh, size);
chunk = (gst_riff_chunk *)(riff->dataleft + riff->nextlikely);
head->type = fcc_type;
memcpy(chunk, head, size);
riff->nextlikely += size;
riff->state = GST_RIFF_STATE_HASSTRH;
return GST_RIFF_OK;
}
gint gst_riff_encoder_strf(GstRiff *riff, void *format, gulong size) {
gst_riff_chunk *chunk;
g_return_val_if_fail(riff->state == GST_RIFF_STATE_HASSTRH, GST_RIFF_EINVAL);
GST_DEBUG (0,"gst_riff_encoder: add strf");
ADD_CHUNK(riff, GST_RIFF_TAG_strf, size);
chunk = (gst_riff_chunk *)(riff->dataleft + riff->nextlikely);
memcpy(chunk, format, size);
riff->nextlikely += size;
riff->state = GST_RIFF_STATE_HASSTRF;
return GST_RIFF_OK;
}
gint gst_riff_encoder_chunk(GstRiff *riff, guint32 chunk_type, void *chunkdata, gulong size) {
gst_riff_chunk *chunk;
g_return_val_if_fail(riff->state == GST_RIFF_STATE_HASSTRF ||
riff->state == GST_RIFF_STATE_MOVI, GST_RIFF_EINVAL);
if (riff->state != GST_RIFF_STATE_MOVI) {
ADD_LIST(riff, 0x00FFFFFF, GST_RIFF_LIST_movi);
riff->state = GST_RIFF_STATE_MOVI;
}
GST_DEBUG (0,"gst_riff_encoder: add chunk type %08x (%4.4s)", chunk_type, (char *)&chunk_type);
ADD_CHUNK(riff, chunk_type, size);
if (chunkdata != NULL) {
chunk = (gst_riff_chunk *)(riff->dataleft + riff->nextlikely);
memcpy(chunk, chunkdata, size);
riff->nextlikely += size + (size&1);
}
return GST_RIFF_OK;
}
GstBuffer *gst_riff_encoder_get_buffer(GstRiff *riff) {
GstBuffer *newbuf;
newbuf = gst_buffer_new();
GST_BUFFER_DATA(newbuf) = riff->dataleft;
GST_BUFFER_SIZE(newbuf) = riff->nextlikely;
return newbuf;
}
GstBuffer *gst_riff_encoder_get_and_reset_buffer(GstRiff *riff) {
GstBuffer *newbuf;
newbuf = gst_riff_encoder_get_buffer(riff);
riff->dataleft = g_malloc(GST_RIFF_ENCODER_BUF_SIZE);
riff->dataleft_size = GST_RIFF_ENCODER_BUF_SIZE;
riff->nextlikely = 0;
return newbuf;
}