/* GStreamer * Copyright (C) <1999> Erik Walthinsen * * 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 /*#define DEBUG_ENABLED */ #include GstRiff* gst_riff_parser_new (GstRiffCallback function, gpointer data) { GstRiff *riff; riff = (GstRiff *)g_malloc(sizeof(GstRiff)); g_return_val_if_fail(riff != NULL, NULL); riff->form = 0; riff->chunks = NULL; riff->state = 0; riff->curoffset = 0; riff->nextlikely = 0; riff->new_tag_found = function; riff->callback_data = data; riff->incomplete_chunk = NULL; riff->dataleft = NULL; return riff; } gint gst_riff_parser_next_buffer (GstRiff *riff, GstBuffer *buf, gulong off) { gulong last, size; GstRiffChunk *chunk; g_return_val_if_fail(riff != NULL, GST_RIFF_EINVAL); g_return_val_if_fail(buf != NULL, GST_RIFF_EINVAL); g_return_val_if_fail(GST_BUFFER_DATA(buf) != NULL, GST_RIFF_EINVAL); size = GST_BUFFER_SIZE(buf); last = off + size; GST_DEBUG ("gst_riff_parser: offset new buffer 0x%08lx size 0x%08x", off, GST_BUFFER_SIZE(buf)); if (riff->dataleft) { gulong newsize; GST_DEBUG ("gst_riff_parser: recovering left data"); newsize = riff->dataleft_size + size; riff->dataleft = g_realloc(riff->dataleft, newsize); memcpy(riff->dataleft+riff->dataleft_size, GST_BUFFER_DATA(buf), size); gst_buffer_unref(buf); buf = gst_buffer_new(); GST_BUFFER_DATA(buf) = riff->dataleft; size = GST_BUFFER_SIZE(buf) = newsize; off -= riff->dataleft_size; /*last -= riff->dataleft_size; */ riff->dataleft = NULL; } if (off == 0) { guint32 *words = (guint32 *)GST_BUFFER_DATA(buf); /* don't even try to parse the head if it's not there FIXME */ if (last < 12) { riff->state = GST_RIFF_ENOTRIFF; return riff->state; } /*g_print("testing is 0x%08lx '%s'\n",words[0],gst_riff_id_to_fourcc(words[0])); */ /* verify this is a valid RIFF file, first of all */ if (GUINT32_FROM_LE (words[0]) != GST_RIFF_TAG_RIFF) { riff->state = GST_RIFF_ENOTRIFF; return riff->state; } riff->form = GUINT32_FROM_LE (words[2]); /*g_print("form is 0x%08lx '%s'\n",words[2],gst_riff_id_to_fourcc(words[2])); */ riff->nextlikely = 12; /* skip 'RIFF', length, and form */ /* all OK here */ riff->incomplete_chunk = NULL; } /* if we have an incomplete chunk from the previous buffer */ if (riff->incomplete_chunk) { guint leftover; GST_DEBUG ("gst_riff_parser: have incomplete chunk %08x filled", riff->incomplete_chunk_size); leftover = riff->incomplete_chunk->size - riff->incomplete_chunk_size; if (leftover <= size) { GST_DEBUG ("gst_riff_parser: we can fill it from %08x with %08x bytes = %08x", riff->incomplete_chunk_size, leftover, riff->incomplete_chunk_size+leftover); memcpy(riff->incomplete_chunk->data+riff->incomplete_chunk_size, GST_BUFFER_DATA(buf), leftover); if (riff->new_tag_found) { riff->new_tag_found(riff->incomplete_chunk, riff->callback_data); } g_free(riff->incomplete_chunk->data); g_free(riff->incomplete_chunk); riff->incomplete_chunk = NULL; } else { GST_DEBUG ("gst_riff_parser: we cannot fill it %08x >= %08lx", leftover, size); memcpy(riff->incomplete_chunk->data+riff->incomplete_chunk_size, GST_BUFFER_DATA(buf), size); riff->incomplete_chunk_size += size; return 0; } } if (riff->nextlikely & 0x01) riff->nextlikely++; GST_DEBUG ("gst_riff_parser: next 0x%08x last 0x%08lx offset %08lx",riff->nextlikely, last, off); /* loop while the next likely chunk header is in this buffer */ while ((riff->nextlikely+12) <= last) { guint32 *words = (guint32 *)((guchar *)GST_BUFFER_DATA(buf) + riff->nextlikely - off ); /* loop over all of the chunks to check which one is finished */ while (riff->chunks) { chunk = g_list_nth_data(riff->chunks, 0); GST_DEBUG ("gst_riff_parser: next 0x%08x offset 0x%08lx size 0x%08x",riff->nextlikely, chunk->offset, chunk->size); if (riff->nextlikely >= chunk->offset+chunk->size) { GST_DEBUG ("gst_riff_parser: found END LIST"); /* we have the end of the chunk on the stack, remove it */ riff->chunks = g_list_remove(riff->chunks, chunk); } else break; } GST_DEBUG ("gst_riff_parser: next likely chunk is at offset 0x%08x",riff->nextlikely); chunk = (GstRiffChunk *)g_malloc(sizeof(GstRiffChunk)); g_return_val_if_fail(chunk != NULL, GST_RIFF_ENOMEM); chunk->offset = riff->nextlikely+8; /* point to the actual data */ chunk->id = GUINT32_FROM_LE (words[0]); chunk->size = GUINT32_FROM_LE (words[1]); chunk->data = (gchar *)(words+2); /* we need word alignment */ /*if (chunk->size & 0x01) chunk->size++; */ chunk->form = GUINT32_FROM_LE (words[2]); /* fill in the form, might not be valid */ if (chunk->id == GST_RIFF_TAG_LIST) { GST_DEBUG ("found LIST %s", gst_riff_id_to_fourcc(chunk->form)); riff->nextlikely += 12; /* we push the list chunk on our 'stack' */ riff->chunks = g_list_prepend(riff->chunks,chunk); /* send the buffer to the listener if we have received a function */ if (riff->new_tag_found) { riff->new_tag_found(chunk, riff->callback_data); } } else { GST_DEBUG ("gst_riff_parser: chunk id offset %08x is 0x%08x '%s' and is 0x%08x long", riff->nextlikely, GUINT32_FROM_LE (words[0]), gst_riff_id_to_fourcc(GUINT32_FROM_LE (words[0])), GUINT32_FROM_LE (words[1])); riff->nextlikely += 8 + chunk->size; /* doesn't include hdr */ /* if this buffer is incomplete */ if (riff->nextlikely > last) { guint left = size - (riff->nextlikely - chunk->size - off); GST_DEBUG ("make incomplete buffer %08x", left); chunk->data = g_malloc(chunk->size); memcpy(chunk->data, (gchar *)(words+2), left); riff->incomplete_chunk = chunk; riff->incomplete_chunk_size = left; } else { /* send the buffer to the listener if we have received a function */ if (riff->new_tag_found) { riff->new_tag_found(chunk, riff->callback_data); } g_free(chunk); } if (riff->nextlikely & 0x01) riff->nextlikely++; /*riff->chunks = g_list_prepend(riff->chunks,chunk); */ } } if ((riff->nextlikely+12) > last && !riff->incomplete_chunk) { guint left = last - riff->nextlikely; GST_DEBUG ("gst_riff_parser: not enough data next 0x%08x last 0x%08lx %08x %08lx",riff->nextlikely, last, left, off); riff->dataleft = g_malloc(left); riff->dataleft_size = left; memcpy(riff->dataleft, GST_BUFFER_DATA(buf)+size-left, left); return 0; } return 0; } void gst_riff_parser_resync (GstRiff *riff, gulong offset) { riff->incomplete_chunk = NULL; riff->dataleft = NULL; riff->nextlikely = offset; } GstRiffChunk *gst_riff_get_chunk(GstRiff *riff,gchar *fourcc) { GList *chunk; g_return_val_if_fail(riff != NULL, NULL); g_return_val_if_fail(fourcc != NULL, NULL); chunk = riff->chunks; while (chunk) { if (((GstRiffChunk *)(chunk->data))->id == gst_riff_fourcc_to_id(fourcc)) return (GstRiffChunk *)(chunk->data); chunk = g_list_next(chunk); } return NULL; } guint32 gst_riff_get_nextlikely(GstRiff *riff) { g_return_val_if_fail(riff != NULL, 0); return riff->nextlikely; }