summaryrefslogtreecommitdiffstats
path: root/apps/plugins/mpegplayer/libmpeg2/decode.c
diff options
context:
space:
mode:
authorMichael Sevakis <jethead71@rockbox.org>2011-02-22 21:44:15 +0000
committerMichael Sevakis <jethead71@rockbox.org>2011-02-22 21:44:15 +0000
commit652463ecc0085c9e04da17631aa1fdb2703eee80 (patch)
treea05cac6777f599f0e8cabc2306e4f3af69428254 /apps/plugins/mpegplayer/libmpeg2/decode.c
parentec6e64ce9011281e6ecbbc0d93b91ce4db2f42dc (diff)
downloadrockbox-652463ecc0085c9e04da17631aa1fdb2703eee80.tar.gz
rockbox-652463ecc0085c9e04da17631aa1fdb2703eee80.tar.bz2
rockbox-652463ecc0085c9e04da17631aa1fdb2703eee80.zip
mpegplayer: Move libmpeg2 files into their own subdirectory so things are less cluttered.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29381 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'apps/plugins/mpegplayer/libmpeg2/decode.c')
-rw-r--r--apps/plugins/mpegplayer/libmpeg2/decode.c527
1 files changed, 527 insertions, 0 deletions
diff --git a/apps/plugins/mpegplayer/libmpeg2/decode.c b/apps/plugins/mpegplayer/libmpeg2/decode.c
new file mode 100644
index 0000000000..9c8081efbe
--- /dev/null
+++ b/apps/plugins/mpegplayer/libmpeg2/decode.c
@@ -0,0 +1,527 @@
+/*
+ * decode.c
+ * Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org>
+ * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
+ *
+ * This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
+ * See http://libmpeg2.sourceforge.net/ for updates.
+ *
+ * mpeg2dec is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * mpeg2dec 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * $Id$
+ * libmpeg2 sync history:
+ * 2008-07-01 - CVS revision 1.114
+ */
+
+#include "plugin.h"
+
+#include "mpeg2dec_config.h"
+
+#include "mpeg2.h"
+#include "attributes.h"
+#include "mpeg2_internal.h"
+
+#define BUFFER_SIZE (1194 * 1024)
+
+#if defined(CPU_COLDFIRE) || (defined(CPU_ARM) && ARM_ARCH >= 6)
+/* twice as large as on other targets because coldfire uses
+ * a secondary, transposed buffer for optimisation */
+static int16_t static_dct_block[128] IBSS_ATTR ATTR_ALIGN(16);
+#define DCT_BLOCKSIZE (128 * sizeof (int16_t))
+#else
+static int16_t static_dct_block[64] IBSS_ATTR ATTR_ALIGN(16);
+#define DCT_BLOCKSIZE (64 * sizeof (int16_t))
+#endif
+
+const mpeg2_info_t * mpeg2_info (mpeg2dec_t * mpeg2dec)
+{
+ return &mpeg2dec->info;
+}
+
+static inline int skip_chunk (mpeg2dec_t * mpeg2dec, int bytes)
+{
+ uint8_t * current;
+ uint32_t shift;
+ uint8_t * limit;
+ uint8_t byte;
+
+ if (!bytes)
+ return 0;
+
+ current = mpeg2dec->buf_start;
+ shift = mpeg2dec->shift;
+ limit = current + bytes;
+
+ do
+ {
+ byte = *current++;
+
+ if (shift == 0x00000100)
+ {
+ int skipped;
+
+ mpeg2dec->shift = 0xffffff00;
+ skipped = current - mpeg2dec->buf_start;
+ mpeg2dec->buf_start = current;
+
+ return skipped;
+ }
+
+ shift = (shift | byte) << 8;
+ }
+ while (current < limit);
+
+ mpeg2dec->shift = shift;
+ mpeg2dec->buf_start = current;
+
+ return 0;
+}
+
+static inline int copy_chunk (mpeg2dec_t * mpeg2dec, int bytes)
+{
+ uint8_t * current;
+ uint32_t shift;
+ uint8_t * chunk_ptr;
+ uint8_t * limit;
+ uint8_t byte;
+
+ if (!bytes)
+ return 0;
+
+ current = mpeg2dec->buf_start;
+ shift = mpeg2dec->shift;
+ chunk_ptr = mpeg2dec->chunk_ptr;
+ limit = current + bytes;
+
+ do
+ {
+ byte = *current++;
+
+ if (shift == 0x00000100)
+ {
+ int copied;
+
+ mpeg2dec->shift = 0xffffff00;
+ mpeg2dec->chunk_ptr = chunk_ptr + 1;
+ copied = current - mpeg2dec->buf_start;
+ mpeg2dec->buf_start = current;
+ return copied;
+ }
+
+ shift = (shift | byte) << 8;
+ *chunk_ptr++ = byte;
+ }
+ while (current < limit);
+
+ mpeg2dec->shift = shift;
+ mpeg2dec->buf_start = current;
+ return 0;
+}
+
+void mpeg2_buffer (mpeg2dec_t * mpeg2dec, uint8_t * start, uint8_t * end)
+{
+ mpeg2dec->buf_start = start;
+ mpeg2dec->buf_end = end;
+}
+
+int mpeg2_getpos (mpeg2dec_t * mpeg2dec)
+{
+ return mpeg2dec->buf_end - mpeg2dec->buf_start;
+}
+
+static inline mpeg2_state_t seek_chunk (mpeg2dec_t * mpeg2dec)
+{
+ int size, skipped;
+
+ size = mpeg2dec->buf_end - mpeg2dec->buf_start;
+ skipped = skip_chunk (mpeg2dec, size);
+
+ if (!skipped)
+ {
+ mpeg2dec->bytes_since_tag += size;
+ return STATE_BUFFER;
+ }
+
+ mpeg2dec->bytes_since_tag += skipped;
+ mpeg2dec->code = mpeg2dec->buf_start[-1];
+
+ return STATE_INTERNAL_NORETURN;
+}
+
+mpeg2_state_t mpeg2_seek_header (mpeg2dec_t * mpeg2dec)
+{
+ while (!(mpeg2dec->code == 0xb3 ||
+ ((mpeg2dec->code == 0xb7 || mpeg2dec->code == 0xb8 ||
+ !mpeg2dec->code) && mpeg2dec->sequence.width != (unsigned)-1)))
+ {
+ if (seek_chunk (mpeg2dec) == STATE_BUFFER)
+ return STATE_BUFFER;
+ }
+
+ mpeg2dec->chunk_start =
+ mpeg2dec->chunk_ptr = mpeg2dec->chunk_buffer;
+
+ mpeg2dec->user_data_len = 0;
+
+ return ((mpeg2dec->code == 0xb7) ?
+ mpeg2_header_end(mpeg2dec) : mpeg2_parse_header(mpeg2dec));
+}
+
+#define RECEIVED(code,state) (((state) << 8) + (code))
+
+mpeg2_state_t mpeg2_parse (mpeg2dec_t * mpeg2dec)
+{
+ int size_buffer, size_chunk, copied;
+
+ if (mpeg2dec->action)
+ {
+ mpeg2_state_t state;
+
+ state = mpeg2dec->action (mpeg2dec);
+
+ if (state > STATE_INTERNAL_NORETURN)
+ return state;
+ }
+
+ while (1)
+ {
+ while ((unsigned) (mpeg2dec->code - mpeg2dec->first_decode_slice) <
+ mpeg2dec->nb_decode_slices)
+ {
+ size_buffer = mpeg2dec->buf_end - mpeg2dec->buf_start;
+ size_chunk = mpeg2dec->chunk_buffer + BUFFER_SIZE -
+ mpeg2dec->chunk_ptr;
+
+ if (size_buffer <= size_chunk)
+ {
+ copied = copy_chunk (mpeg2dec, size_buffer);
+
+ if (!copied)
+ {
+ mpeg2dec->bytes_since_tag += size_buffer;
+ mpeg2dec->chunk_ptr += size_buffer;
+ return STATE_BUFFER;
+ }
+ }
+ else
+ {
+ copied = copy_chunk (mpeg2dec, size_chunk);
+
+ if (!copied)
+ {
+ /* filled the chunk buffer without finding a start code */
+ mpeg2dec->bytes_since_tag += size_chunk;
+ mpeg2dec->action = seek_chunk;
+ return STATE_INVALID;
+ }
+ }
+
+ mpeg2dec->bytes_since_tag += copied;
+
+ mpeg2_slice (&mpeg2dec->decoder, mpeg2dec->code,
+ mpeg2dec->chunk_start);
+ mpeg2dec->code = mpeg2dec->buf_start[-1];
+ mpeg2dec->chunk_ptr = mpeg2dec->chunk_start;
+ }
+
+ if ((unsigned) (mpeg2dec->code - 1) >= 0xb0 - 1)
+ break;
+
+ if (seek_chunk (mpeg2dec) == STATE_BUFFER)
+ return STATE_BUFFER;
+ }
+
+ mpeg2dec->action = mpeg2_seek_header;
+
+ switch (mpeg2dec->code)
+ {
+ case 0x00:
+ return mpeg2dec->state;
+ case 0xb3:
+ case 0xb7:
+ case 0xb8:
+ return (mpeg2dec->state == STATE_SLICE) ? STATE_SLICE : STATE_INVALID;
+ default:
+ mpeg2dec->action = seek_chunk;
+ return STATE_INVALID;
+ }
+}
+
+mpeg2_state_t mpeg2_parse_header (mpeg2dec_t * mpeg2dec)
+{
+ static int (* const process_header[9]) (mpeg2dec_t *) =
+ {
+ mpeg2_header_picture,
+ mpeg2_header_extension,
+ mpeg2_header_user_data,
+ mpeg2_header_sequence,
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ mpeg2_header_gop
+ };
+
+ int size_buffer, size_chunk, copied;
+
+ mpeg2dec->action = mpeg2_parse_header;
+ mpeg2dec->info.user_data = NULL;
+ mpeg2dec->info.user_data_len = 0;
+
+ while (1)
+ {
+ size_buffer = mpeg2dec->buf_end - mpeg2dec->buf_start;
+ size_chunk = mpeg2dec->chunk_buffer + BUFFER_SIZE -
+ mpeg2dec->chunk_ptr;
+
+ if (size_buffer <= size_chunk)
+ {
+ copied = copy_chunk (mpeg2dec, size_buffer);
+
+ if (!copied)
+ {
+ mpeg2dec->bytes_since_tag += size_buffer;
+ mpeg2dec->chunk_ptr += size_buffer;
+ return STATE_BUFFER;
+ }
+ }
+ else
+ {
+ copied = copy_chunk (mpeg2dec, size_chunk);
+
+ if (!copied)
+ {
+ /* filled the chunk buffer without finding a start code */
+ mpeg2dec->bytes_since_tag += size_chunk;
+ mpeg2dec->code = 0xb4;
+ mpeg2dec->action = mpeg2_seek_header;
+ return STATE_INVALID;
+ }
+ }
+
+ mpeg2dec->bytes_since_tag += copied;
+
+ if (process_header[mpeg2dec->code & 0x0b] (mpeg2dec))
+ {
+ mpeg2dec->code = mpeg2dec->buf_start[-1];
+ mpeg2dec->action = mpeg2_seek_header;
+ return STATE_INVALID;
+ }
+
+ mpeg2dec->code = mpeg2dec->buf_start[-1];
+
+ switch (RECEIVED (mpeg2dec->code, mpeg2dec->state))
+ {
+ /* state transition after a sequence header */
+ case RECEIVED (0x00, STATE_SEQUENCE):
+ case RECEIVED (0xb8, STATE_SEQUENCE):
+ mpeg2_header_sequence_finalize (mpeg2dec);
+ break;
+
+ /* other legal state transitions */
+ case RECEIVED (0x00, STATE_GOP):
+ mpeg2_header_gop_finalize (mpeg2dec);
+ break;
+ case RECEIVED (0x01, STATE_PICTURE):
+ case RECEIVED (0x01, STATE_PICTURE_2ND):
+ mpeg2_header_picture_finalize (mpeg2dec);
+ mpeg2dec->action = mpeg2_header_slice_start;
+ break;
+
+ /* legal headers within a given state */
+ case RECEIVED (0xb2, STATE_SEQUENCE):
+ case RECEIVED (0xb2, STATE_GOP):
+ case RECEIVED (0xb2, STATE_PICTURE):
+ case RECEIVED (0xb2, STATE_PICTURE_2ND):
+ case RECEIVED (0xb5, STATE_SEQUENCE):
+ case RECEIVED (0xb5, STATE_PICTURE):
+ case RECEIVED (0xb5, STATE_PICTURE_2ND):
+ mpeg2dec->chunk_ptr = mpeg2dec->chunk_start;
+ continue;
+
+ default:
+ mpeg2dec->action = mpeg2_seek_header;
+ return STATE_INVALID;
+ }
+
+ mpeg2dec->chunk_start = mpeg2dec->chunk_ptr = mpeg2dec->chunk_buffer;
+ mpeg2dec->user_data_len = 0;
+
+ return mpeg2dec->state;
+ }
+}
+
+int mpeg2_convert (mpeg2dec_t * mpeg2dec, mpeg2_convert_t convert, void * arg)
+{
+ mpeg2_convert_init_t convert_init;
+ int error;
+
+ error = convert (MPEG2_CONVERT_SET, NULL, &mpeg2dec->sequence, 0,
+ arg, &convert_init);
+
+ if (!error)
+ {
+ mpeg2dec->convert = convert;
+ mpeg2dec->convert_arg = arg;
+ mpeg2dec->convert_id_size = convert_init.id_size;
+ mpeg2dec->convert_stride = 0;
+ }
+
+ return error;
+}
+
+int mpeg2_stride (mpeg2dec_t * mpeg2dec, int stride)
+{
+ if (!mpeg2dec->convert)
+ {
+ if (stride < (int) mpeg2dec->sequence.width)
+ stride = mpeg2dec->sequence.width;
+
+ mpeg2dec->decoder.stride_frame = stride;
+ }
+ else
+ {
+ mpeg2_convert_init_t convert_init;
+
+ stride = mpeg2dec->convert(MPEG2_CONVERT_STRIDE, NULL,
+ &mpeg2dec->sequence, stride,
+ mpeg2dec->convert_arg,
+ &convert_init);
+
+ mpeg2dec->convert_id_size = convert_init.id_size;
+ mpeg2dec->convert_stride = stride;
+ }
+
+ return stride;
+}
+
+void mpeg2_set_buf (mpeg2dec_t * mpeg2dec, uint8_t * buf[MPEG2_COMPONENTS], void * id)
+{
+ mpeg2_fbuf_t * fbuf;
+
+ if (mpeg2dec->custom_fbuf)
+ {
+ if (mpeg2dec->state == STATE_SEQUENCE)
+ {
+ mpeg2dec->fbuf[2] = mpeg2dec->fbuf[1];
+ mpeg2dec->fbuf[1] = mpeg2dec->fbuf[0];
+ }
+
+ mpeg2_set_fbuf (mpeg2dec, (mpeg2dec->decoder.coding_type ==
+ PIC_FLAG_CODING_TYPE_B));
+
+ fbuf = mpeg2dec->fbuf[0];
+ }
+ else
+ {
+ fbuf = &mpeg2dec->fbuf_alloc[mpeg2dec->alloc_index].fbuf;
+ mpeg2dec->alloc_index_user = ++mpeg2dec->alloc_index;
+ }
+
+ fbuf->buf[0] = buf[0];
+#if MPEG2_COLOR
+ fbuf->buf[1] = buf[1];
+ fbuf->buf[2] = buf[2];
+#endif
+
+ fbuf->id = id;
+}
+
+void mpeg2_custom_fbuf (mpeg2dec_t * mpeg2dec, int custom_fbuf)
+{
+ mpeg2dec->custom_fbuf = custom_fbuf;
+}
+
+void mpeg2_skip (mpeg2dec_t * mpeg2dec, int skip)
+{
+ mpeg2dec->first_decode_slice = 1;
+ mpeg2dec->nb_decode_slices = skip ? 0 : (0xb0 - 1);
+}
+
+void mpeg2_slice_region (mpeg2dec_t * mpeg2dec, int start, int end)
+{
+ start = (start < 1) ? 1 : (start > 0xb0) ? 0xb0 : start;
+ end = (end < start) ? start : (end > 0xb0) ? 0xb0 : end;
+ mpeg2dec->first_decode_slice = start;
+ mpeg2dec->nb_decode_slices = end - start;
+}
+
+void mpeg2_tag_picture (mpeg2dec_t * mpeg2dec, uint32_t tag, uint32_t tag2)
+{
+ mpeg2dec->tag_previous = mpeg2dec->tag_current;
+ mpeg2dec->tag2_previous = mpeg2dec->tag2_current;
+ mpeg2dec->tag_current = tag;
+ mpeg2dec->tag2_current = tag2;
+ mpeg2dec->num_tags++;
+ mpeg2dec->bytes_since_tag = 0;
+}
+
+void mpeg2_reset (mpeg2dec_t * mpeg2dec, int full_reset)
+{
+ mpeg2dec->buf_start = mpeg2dec->buf_end = NULL;
+ mpeg2dec->num_tags = 0;
+ mpeg2dec->shift = 0xffffff00;
+ mpeg2dec->code = 0xb4;
+ mpeg2dec->action = mpeg2_seek_header;
+ mpeg2dec->state = STATE_INVALID;
+ mpeg2dec->first = 1;
+
+ mpeg2_reset_info(&mpeg2dec->info);
+ mpeg2dec->info.gop = NULL;
+ mpeg2dec->info.user_data = NULL;
+ mpeg2dec->info.user_data_len = 0;
+
+ if (full_reset)
+ {
+ mpeg2dec->info.sequence = NULL;
+ mpeg2_header_state_init (mpeg2dec);
+ }
+}
+
+mpeg2dec_t * mpeg2_init (void)
+{
+ mpeg2dec_t * mpeg2dec;
+
+ mpeg2_idct_init ();
+
+ mpeg2dec = (mpeg2dec_t *)mpeg2_bufalloc(sizeof (mpeg2dec_t),
+ MPEG2_ALLOC_MPEG2DEC);
+ if (mpeg2dec == NULL)
+ return NULL;
+
+ mpeg2dec->decoder.DCTblock = static_dct_block;
+
+ rb->memset (mpeg2dec->decoder.DCTblock, 0, DCT_BLOCKSIZE);
+
+ DEBUGF("DCTblock: %p\n", mpeg2dec->decoder.DCTblock);
+
+ mpeg2dec->chunk_buffer = (uint8_t *)mpeg2_bufalloc(BUFFER_SIZE + 4,
+ MPEG2_ALLOC_CHUNK);
+
+ mpeg2dec->sequence.width = (unsigned)-1;
+ mpeg2_reset (mpeg2dec, 1);
+
+ return mpeg2dec;
+}
+
+void mpeg2_close (mpeg2dec_t * mpeg2dec)
+{
+ mpeg2_header_state_init (mpeg2dec);
+#if 0
+ /* These are dedicated buffers in rockbox */
+ mpeg2_free (mpeg2dec->chunk_buffer);
+ mpeg2_free (mpeg2dec);
+#endif
+}