--- /dev/null
+/*
+ * gstjpegparser.c - JPEG parser for baseline
+ *
+ * Copyright (C) 2011 Intel Corporation
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1
+ * 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free
+ * Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA
+ */
+
+#include "gstjpegparser.h"
+
+#include <string.h>
+#include <gst/base/gstbytereader.h>
+
+#ifndef GST_DISABLE_GST_DEBUG
+
+#define GST_CAT_DEFAULT ensure_debug_category()
+
+static GstDebugCategory *
+ensure_debug_category (void)
+{
+ static gsize cat_gonce = 0;
+
+ if (g_once_init_enter (&cat_gonce)) {
+ gsize cat_done;
+
+ cat_done = (gsize) _gst_debug_category_new ("codecparsers_jpeg", 0,
+ "GstJpegCodecParser");
+
+ g_once_init_leave (&cat_gonce, cat_done);
+ }
+
+ return (GstDebugCategory *) cat_gonce;
+}
+#else
+
+#define ensure_debug_category() /* NOOP */
+
+#endif /* GST_DISABLE_GST_DEBUG */
+
+#define DEBUG_PRINT_COMMENT 0
+
+#define CHECK_FAILED(exp, ret) G_STMT_START { \
+ if (!(exp)) { \
+ result = ret; \
+ goto wrong_state; \
+ } \
+ } G_STMT_END
+
+#define JPEG_RESULT_CHECK(result) G_STMT_START { \
+ if ((result) != GST_JPEG_PARSER_OK) { \
+ goto wrong_state; \
+ } \
+ } G_STMT_END
+
+#define READ_UINT8(reader, val) G_STMT_START { \
+ if (!gst_byte_reader_get_uint8 ((reader), &val)) { \
+ GST_WARNING ("failed to read uint8"); \
+ goto failed; \
+ } \
+ } G_STMT_END
+
+#define READ_UINT16(reader, val) G_STMT_START { \
+ if (!gst_byte_reader_get_uint16_be ((reader), &val)) { \
+ GST_WARNING ("failed to read uint16"); \
+ goto failed; \
+ } \
+ } G_STMT_END
+
+#define READ_BYTES(reader, buf, length) G_STMT_START { \
+ const guint8 *vals; \
+ if (!gst_byte_reader_get_data(reader, length, &vals)) { \
+ GST_WARNING("failed to read bytes, size:%d", length); \
+ goto failed; \
+ } \
+ memcpy(buf, vals, length); \
+ } G_STMT_END
+
+/* Table B.1: marker code assignments */
+enum JPEG_MARKER
+{
+ GST_JPEG_SOF0 = 0xC0, /* Frame Profile, Baseline */
+ GST_JPEG_SOFF = 0xCF,
+ GST_JPEG_DHT = 0xC4, /* Define Huffman Table */
+ GST_JPEG_DAC = 0xCC, /* Define Arithmetic Coding conditioning */
+ GST_JPEG_RST0 = 0xD0, /* Restart with modulo 8 */
+ GST_JPEG_RST7 = 0xD7,
+ GST_JPEG_SOI = 0xD8, /* Start Of Image */
+ GST_JPEG_EOI = 0xD9, /* End Of Image */
+ GST_JPEG_SOS = 0xDA, /* Start Of Scan */
+ GST_JPEG_DQT = 0xDB, /* Define Quantization Table */
+ GST_JPEG_DNL = 0xDC, /* Define Num of Lines */
+ GST_JPEG_DRI = 0xDD, /* Define Restart Interval */
+ GST_JPEG_APP0 = 0xE0, /* Application segments */
+ GST_JPEG_APPF = 0xEF,
+ GST_JPEG_COM = 0xFE, /* Comments */
+};
+static gboolean jpeg_parse_to_next_marker (GstByteReader * reader,
+ guint8 * marker);
+
+/* CCITT T.81, Annex K.1 Quantization tables for luminance and chrominance components */
+/* only for 8-bit per sample image*/
+static const guint8 default_quant_luma_zigzag[64] = {
+ 0x10, 0x0b, 0x0c, 0x0e, 0x0c, 0x0a, 0x10, 0x0e,
+ 0x0d, 0x0e, 0x12, 0x11, 0x10, 0x13, 0x18, 0x27,
+ 0x1a, 0x18, 0x16, 0x16, 0x18, 0x31, 0x23, 0x25,
+ 0x1d, 0x28, 0x3a, 0x33, 0x3d, 0x3c, 0x39, 0x33,
+ 0x38, 0x37, 0x40, 0x48, 0x5c, 0x4e, 0x40, 0xa8,
+ 0x57, 0x45, 0x37, 0x38, 0x50, 0x6d, 0xb5, 0x57,
+ 0x5f, 0x62, 0x67, 0x68, 0x67, 0x3e, 0x4d, 0x71,
+ 0x79, 0x70, 0x64, 0x78, 0x5c, 0x65, 0x67, 0x63,
+};
+
+static const guint8 default_quant_chroma_zigzag[64] = {
+ 0x11, 0x12, 0x12, 0x18, 0x15, 0x18, 0x2f, 0x1a,
+ 0x1a, 0x2f, 0x63, 0x42, 0x38, 0x42, 0x63, 0x63,
+ 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
+ 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
+ 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
+ 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
+ 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
+ 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63
+};
+
+/* Table K.3: typical Huffman tables for 8-bit precision luminance and chrominance */
+static const guint8 default_dc_luma_bits[16] = {
+ 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0
+};
+
+static const guint8 default_dc_luma_vals[16] = {
+ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11
+};
+
+static const guint8 default_dc_chroma_bits[16] = {
+ 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0
+};
+
+static const guint8 default_dc_chroma_vals[16] = {
+ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11
+};
+
+static const guint8 default_ac_luma_bits[16] = {
+ 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 125
+};
+
+static const guint8 default_ac_luma_vals[256] = {
+ 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
+ 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
+ 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
+ 0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
+ 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
+ 0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
+ 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
+ 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
+ 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
+ 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
+ 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
+ 0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
+ 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
+ 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
+ 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
+ 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
+ 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
+ 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
+ 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
+ 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
+ 0xf9, 0xfa
+};
+
+static const guint8 default_ac_chroma_bits[16] = {
+ 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 119
+};
+
+static const guint8 default_ac_chroma_vals[256] = {
+ 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
+ 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
+ 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
+ 0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
+ 0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
+ 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
+ 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
+ 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
+ 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
+ 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
+ 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
+ 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
+ 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
+ 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
+ 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
+ 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
+ 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
+ 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
+ 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
+ 0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
+ 0xf9, 0xfa
+};
+
+static gboolean
+jpeg_parse_to_next_marker (GstByteReader * reader, guint8 * marker)
+{
+ guint8 value;
+
+ while (gst_byte_reader_get_uint8 (reader, &value)) {
+ if (value != 0xFF)
+ continue;
+ while (value == 0xFF) {
+ READ_UINT8 (reader, value);
+ }
+ if (value == 0x00)
+ continue;
+ *marker = value;
+ return TRUE;
+ }
+
+failed:
+ return FALSE;
+}
+
+static GstJpegParserResult
+jpeg_parse_frame (GstJpegImage * image, const guint8 * buf, guint32 length)
+{
+ GstByteReader bytes_reader = GST_BYTE_READER_INIT (buf, length);
+ GstJpegParserResult result = GST_JPEG_PARSER_OK;
+ guint8 val;
+ u_int i;
+
+ g_assert (image && buf && length);
+ READ_UINT8 (&bytes_reader, image->sample_precision);
+ READ_UINT16 (&bytes_reader, image->height);
+ READ_UINT16 (&bytes_reader, image->width);
+ READ_UINT8 (&bytes_reader, image->num_components);
+ CHECK_FAILED (image->num_components <= GST_JPEG_MAX_COMPONENTS,
+ GST_JPEG_PARSER_FRAME_ERROR);
+ for (i = 0; i < image->num_components; i++) {
+ READ_UINT8 (&bytes_reader, image->components[i].identifier);
+ READ_UINT8 (&bytes_reader, val);
+ image->components[i].horizontal_factor = (val >> 4) & 0x0F;
+ image->components[i].vertical_factor = (val & 0x0F);
+ READ_UINT8 (&bytes_reader, image->components[i].quant_table_selector);
+ CHECK_FAILED ((image->components[i].horizontal_factor <= 4 &&
+ image->components[i].vertical_factor <= 4 &&
+ image->components[i].quant_table_selector < 4),
+ GST_JPEG_PARSER_FRAME_ERROR);
+ }
+ return GST_JPEG_PARSER_OK;
+
+failed:
+ return GST_JPEG_PARSER_FRAME_ERROR;
+
+wrong_state:
+ return result;
+}
+
+static GstJpegParserResult
+jpeg_parse_scan (GstJpegImage * image, const guint8 * buf, guint32 length)
+{
+ GstByteReader bytes_reader = GST_BYTE_READER_INIT (buf, length);
+ GstJpegParserResult result = GST_JPEG_PARSER_OK;
+ guint8 val;
+ u_int i;
+
+ g_assert (image && buf && length);
+ READ_UINT8 (&bytes_reader, image->current_scan.num_components);
+ CHECK_FAILED (image->current_scan.num_components <= GST_JPEG_MAX_COMPONENTS,
+ GST_JPEG_PARSER_SCAN_ERROR);
+ for (i = 0; i < image->current_scan.num_components; i++) {
+ READ_UINT8 (&bytes_reader,
+ image->current_scan.components[i].component_selector);
+ READ_UINT8 (&bytes_reader, val);
+ image->current_scan.components[i].dc_selector = (val >> 4) & 0x0F;
+ image->current_scan.components[i].ac_selector = val & 0x0F;
+ g_assert (image->current_scan.components[i].dc_selector < 4 &&
+ image->current_scan.components[i].ac_selector < 4);
+ CHECK_FAILED ((image->current_scan.components[i].dc_selector < 4 &&
+ image->current_scan.components[i].ac_selector < 4),
+ GST_JPEG_PARSER_SCAN_ERROR);
+ }
+ return GST_JPEG_PARSER_OK;
+
+failed:
+ return GST_JPEG_PARSER_SCAN_ERROR;
+
+wrong_state:
+ return result;
+}
+
+static GstJpegParserResult
+jpeg_parse_huffman_tables (GstJpegImage * image, const guint8 * buf,
+ guint32 length)
+{
+ GstByteReader bytes_reader = GST_BYTE_READER_INIT (buf, length);
+ GstJpegParserResult result = GST_JPEG_PARSER_OK;
+ GstJpegHuffmanTable *huf_table;
+ guint8 tmp_val;
+ gboolean is_dc;
+ guint8 table_index;
+ guint32 value_count;
+ u_int i;
+
+ g_assert (image && buf && length);
+ while (gst_byte_reader_get_remaining (&bytes_reader)) {
+ READ_UINT8 (&bytes_reader, tmp_val);
+ is_dc = !((tmp_val >> 4) & 0x0F);
+ table_index = (tmp_val & 0x0F);
+ CHECK_FAILED (table_index < GST_JPEG_MAX_COMPONENTS,
+ GST_JPEG_PARSER_HUFFMAN_ERROR);
+ if (is_dc) {
+ huf_table = &image->dc_huf_tables[table_index];
+ } else {
+ huf_table = &image->ac_huf_tables[table_index];
+ }
+ READ_BYTES (&bytes_reader, huf_table->huf_bits, 16);
+ value_count = 0;
+ for (i = 0; i < 16; i++)
+ value_count += huf_table->huf_bits[i];
+ READ_BYTES (&bytes_reader, huf_table->huf_values, value_count);
+ }
+ return GST_JPEG_PARSER_OK;
+
+failed:
+ return GST_JPEG_PARSER_HUFFMAN_ERROR;
+
+wrong_state:
+ return result;
+}
+
+static GstJpegParserResult
+jpeg_parse_quantization_table (GstJpegImage * image, const guint8 * buf,
+ guint32 length)
+{
+ GstByteReader bytes_reader = GST_BYTE_READER_INIT (buf, length);
+ GstJpegParserResult result = GST_JPEG_PARSER_OK;
+ GstJpegQuantTable *quant_table;
+ guint8 val;
+ guint8 table_index;
+
+ g_assert (image && buf && length);
+ while (gst_byte_reader_get_remaining (&bytes_reader)) {
+ READ_UINT8 (&bytes_reader, val);
+ table_index = (val & 0x0f);
+ CHECK_FAILED (table_index < GST_JPEG_MAX_COMPONENTS,
+ GST_JPEG_PARSER_QUANT_ERROR);
+ quant_table = &(image->quant_tables[table_index]);
+ quant_table->quant_precision = ((val >> 4) & 0x0f);
+ if (!quant_table->quant_precision) { /* 8-bit values */
+ READ_BYTES (&bytes_reader, quant_table->quant_table, 64);
+ } else { /* 16-bit values */
+ READ_BYTES (&bytes_reader, quant_table->quant_table, 128);
+ }
+ }
+ return GST_JPEG_PARSER_OK;
+
+failed:
+ return GST_JPEG_PARSER_QUANT_ERROR;
+
+wrong_state:
+ return result;
+}
+
+static GstJpegParserResult
+jpeg_parse_restart_interval (GstJpegImage * image, const guint8 * buf,
+ guint32 length)
+{
+ GstByteReader bytes_reader = GST_BYTE_READER_INIT (buf, length);
+ guint16 interval;
+
+ g_assert (image && buf && length);
+ READ_UINT16 (&bytes_reader, interval);
+ image->restart_interval = interval;
+ return GST_JPEG_PARSER_OK;
+
+failed:
+ return GST_JPEG_PARSER_QUANT_ERROR;
+}
+
+static GstJpegParserResult
+jpeg_parse_comments (GstJpegImage * image, const guint8 * buf, guint32 length)
+{
+ g_assert (image);
+#if DEBUG_PRINT_COMMENT
+ char *comments = (char *) g_malloc0 (length + 1);
+ memcpy (comments, buf, length);
+ comments[length] = '\0';
+ GST_DEBUG ("jpeg comments:%s\n", comments);
+ g_free (comments);
+#endif
+ return GST_JPEG_PARSER_OK;
+}
+
+static void
+jpeg_set_default_huffman_tables (GstJpegImage * image)
+{
+ /* luma */
+ memcpy (image->dc_huf_tables[0].huf_bits, default_dc_luma_bits, 16);
+ memcpy (image->dc_huf_tables[0].huf_values, default_dc_luma_vals, 16);
+ memcpy (image->ac_huf_tables[0].huf_bits, default_ac_luma_bits, 16);
+ memcpy (image->ac_huf_tables[0].huf_values, default_ac_luma_vals, 256);
+
+ /* chroma */
+ memcpy (image->dc_huf_tables[1].huf_bits, default_dc_chroma_bits, 16);
+ memcpy (image->dc_huf_tables[1].huf_values, default_dc_chroma_vals, 16);
+ memcpy (image->ac_huf_tables[1].huf_bits, default_ac_chroma_bits, 16);
+ memcpy (image->ac_huf_tables[1].huf_values, default_ac_chroma_vals, 256);
+}
+
+static void
+jpeg_set_default_quantization_tables (GstJpegImage * image)
+{
+ /* luma */
+ image->quant_tables[0].quant_precision = 0;
+ memcpy (image->quant_tables[0].quant_table, default_quant_luma_zigzag, 64);
+
+ /* chroma */
+ image->quant_tables[1].quant_precision = 0;
+ memcpy (image->quant_tables[1].quant_table, default_quant_chroma_zigzag, 64);
+}
+
+GstJpegParserResult
+gst_jpeg_parse_image (GstJpegImage * image, const guint8 * buf, guint32 size)
+{
+ GstByteReader bytes_reader;
+ GstJpegParserResult result = GST_JPEG_PARSER_OK;
+ guint8 marker;
+ guint16 header_length;
+ const guint8 *header_buf;
+ gboolean first_scan_reached = FALSE;
+ gboolean has_huffman_tables = FALSE, has_quant_tables = FALSE;
+
+ g_assert (image && buf && size);
+ memset (image, 0, sizeof (GstJpegImage));
+ gst_byte_reader_init (&bytes_reader, buf, size);
+
+ /* read SOI */
+ CHECK_FAILED (jpeg_parse_to_next_marker (&bytes_reader, &marker)
+ && GST_JPEG_SOI == marker, GST_JPEG_PARSER_NOT_JPEG);
+ image->jpeg_begin = buf + gst_byte_reader_get_pos (&bytes_reader) - 2;
+ image->jpeg_end = buf + size;
+
+ while (jpeg_parse_to_next_marker (&bytes_reader, &marker)) {
+ if (marker >= GST_JPEG_SOF0 && marker <= GST_JPEG_SOFF
+ && marker != GST_JPEG_DHT && marker != GST_JPEG_DAC) {
+ g_assert (marker == GST_JPEG_SOF0);
+ if (marker > GST_JPEG_SOF0) {
+ GST_WARNING ("codecparser_jpeg cannot support this image type:%02x",
+ marker);
+ result = GST_JPEG_PARSER_UNSUPPORTED_PROFILE;
+ goto wrong_state;
+ }
+ image->frame_type = marker;
+ marker = GST_JPEG_SOF0;
+ }
+ if (marker == GST_JPEG_EOI) {
+ image->jpeg_end = buf + gst_byte_reader_get_pos (&bytes_reader);
+ break;
+ } else {
+ READ_UINT16 (&bytes_reader, header_length);
+ CHECK_FAILED ((header_length >= 2 &&
+ gst_byte_reader_get_remaining (&bytes_reader) + 2 >=
+ header_length), GST_JPEG_PARSER_BROKEN_DATA);
+ header_length -= 2;
+ header_buf = buf + gst_byte_reader_get_pos (&bytes_reader);
+ }
+
+ switch (marker) {
+ case GST_JPEG_SOF0:
+ JPEG_RESULT_CHECK (result =
+ jpeg_parse_frame (image, header_buf, header_length));
+ break;
+ case GST_JPEG_DHT:
+ JPEG_RESULT_CHECK (result =
+ jpeg_parse_huffman_tables (image, header_buf, header_length));
+ has_huffman_tables = TRUE;
+ break;
+ case GST_JPEG_SOS:
+ JPEG_RESULT_CHECK (result =
+ jpeg_parse_scan (image, header_buf, header_length));
+ first_scan_reached = TRUE; /* read to first scan stop */
+ break;
+ case GST_JPEG_DQT:
+ JPEG_RESULT_CHECK (result =
+ jpeg_parse_quantization_table (image, header_buf, header_length));
+ has_quant_tables = TRUE;
+ break;
+ case GST_JPEG_DRI:
+ JPEG_RESULT_CHECK (result =
+ jpeg_parse_restart_interval (image, header_buf, header_length));
+ break;
+ case GST_JPEG_COM:
+ JPEG_RESULT_CHECK (result =
+ jpeg_parse_comments (image, header_buf, header_length));
+ break;
+ case GST_JPEG_DAC:
+ case GST_JPEG_DNL:
+ default:
+ /* Unsupported markers, skip them */
+ break;
+ }
+ gst_byte_reader_skip (&bytes_reader, header_length);
+ if (first_scan_reached)
+ break;
+ }
+
+ image->jpeg_pos = buf + gst_byte_reader_get_pos (&bytes_reader);
+ if (!first_scan_reached) {
+ GST_WARNING ("jpeg no scan was found\n");
+ return GST_JPEG_PARSER_NO_SCAN_FOUND;
+ }
+ if (!has_huffman_tables)
+ jpeg_set_default_huffman_tables (image);
+ if (!has_quant_tables)
+ jpeg_set_default_quantization_tables (image);
+
+ return GST_JPEG_PARSER_OK;
+
+failed:
+ GST_WARNING ("jpeg parsing read broken data");
+ return GST_JPEG_PARSER_BROKEN_DATA;
+
+wrong_state:
+ return result;
+
+}
+
+GstJpegParserResult
+gst_jpeg_parse_next_scan (GstJpegImage * image)
+{
+ GstByteReader bytes_reader;
+ GstJpegParserResult result = GST_JPEG_PARSER_OK;
+ guint8 marker;
+ guint16 header_length;
+ const guint8 *header_buf;
+ gboolean scan_found = FALSE;
+
+ g_assert (image->jpeg_begin && image->jpeg_end && image->jpeg_pos);
+ if (!image->jpeg_begin || !image->jpeg_end || !image->jpeg_pos
+ || image->jpeg_pos >= image->jpeg_end)
+ return GST_JPEG_PARSER_NO_SCAN_FOUND;
+ gst_byte_reader_init (&bytes_reader, image->jpeg_pos,
+ image->jpeg_end - image->jpeg_pos);
+
+ while (jpeg_parse_to_next_marker (&bytes_reader, &marker)) {
+ if (marker == GST_JPEG_EOI) {
+ image->jpeg_end =
+ image->jpeg_pos + gst_byte_reader_get_pos (&bytes_reader);
+ break;
+ }
+ if (marker != GST_JPEG_SOS)
+ continue;
+ READ_UINT16 (&bytes_reader, header_length);
+ CHECK_FAILED ((header_length >= 2 &&
+ gst_byte_reader_get_remaining (&bytes_reader) + 2 >= header_length),
+ GST_JPEG_PARSER_SCAN_ERROR);
+ header_length -= 2;
+ header_buf = image->jpeg_pos + gst_byte_reader_get_pos (&bytes_reader);
+ JPEG_RESULT_CHECK (result =
+ jpeg_parse_scan (image, header_buf, header_length));
+ scan_found = TRUE;
+ break;
+ }
+ image->jpeg_pos += gst_byte_reader_get_pos (&bytes_reader);
+ if (!scan_found)
+ return GST_JPEG_PARSER_NO_SCAN_FOUND;
+
+ return GST_JPEG_PARSER_OK;
+failed:
+ GST_WARNING ("jpeg parsing read broken data");
+ return GST_JPEG_PARSER_BROKEN_DATA;
+
+wrong_state:
+ return result;
+}
+
+guint32
+gst_jpeg_skip_to_scan_end (GstJpegImage * image)
+{
+ GstByteReader bytes_reader;
+ guint8 marker;
+ guint32 skip_bytes = 0;
+ gboolean next_marker_found = FALSE;
+
+ g_assert (image->jpeg_begin && image->jpeg_end && image->jpeg_pos);
+ if (!image->jpeg_begin || !image->jpeg_end || !image->jpeg_pos
+ || image->jpeg_pos >= image->jpeg_end)
+ return 0;
+ gst_byte_reader_init (&bytes_reader, image->jpeg_pos,
+ image->jpeg_end - image->jpeg_pos);
+ while (jpeg_parse_to_next_marker (&bytes_reader, &marker)) {
+ if (marker >= GST_JPEG_RST0 && marker <= GST_JPEG_RST7)
+ continue;
+ next_marker_found = TRUE;
+ break;
+ }
+ if (next_marker_found)
+ skip_bytes = gst_byte_reader_get_pos (&bytes_reader) - 2;
+ else
+ skip_bytes = gst_byte_reader_get_pos (&bytes_reader);
+ image->jpeg_pos += skip_bytes;
+ return skip_bytes;
+}
+
+const guint8 *
+gst_jpeg_get_position (GstJpegImage * image)
+{
+ return image->jpeg_pos;
+}
+
+guint32
+gst_jpeg_get_left_size (GstJpegImage * image)
+{
+ if (image->jpeg_end > image->jpeg_pos)
+ return image->jpeg_end - image->jpeg_pos;
+ return 0;
+}
projects / platform / upstream / gstreamer.git / commitdiff