/* GStreamer RIFF I/O

 * Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>

 *

 * riff-read.c: RIFF input file parsing

 *

 * 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.

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <string.h>

#include <gst/gstutils.h>

#include <gst/tag/tag.h>

#include "riff-read.h"

GST_DEBUG_CATEGORY_EXTERN (riff_debug);

#define GST_CAT_DEFAULT riff_debug

/**

 * gst_riff_read_chunk:

 * @element: caller element (used for debugging).

 * @pad: pad to pull data from.

 * @offset: offset to pull from, incremented by this function.

 * @tag: fourcc of the chunk (returned by this function).

 * @chunk_data: buffer (returned by this function).

 *

 * Reads a single chunk of data. Since 0.10.8 'JUNK' chunks

 * are skipped automatically.

 *

 * Returns: flow status.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

GstFlowReturn

gst_riff_read_chunk (GstElement * element,

    GstPad * pad, guint64 * _offset, guint32 * tag, GstBuffer ** _chunk_data)

{

  GstBuffer *buf;

  GstFlowReturn res;

  guint size;

  guint64 offset = *_offset;

  g_return_val_if_fail (element != NULL, GST_FLOW_ERROR);

  g_return_val_if_fail (pad != NULL, GST_FLOW_ERROR);

  g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR);

  g_return_val_if_fail (tag != NULL, GST_FLOW_ERROR);

  g_return_val_if_fail (_chunk_data != NULL, GST_FLOW_ERROR);

skip_junk:

  size = 8;

  if ((res = gst_pad_pull_range (pad, offset, size, &buf)) != GST_FLOW_OK)

    return res;

  else if (GST_BUFFER_SIZE (buf) < size)

    goto too_small;

  *tag = GST_READ_UINT32_LE (GST_BUFFER_DATA (buf));

  size = GST_READ_UINT32_LE (GST_BUFFER_DATA (buf) + 4);

  gst_buffer_unref (buf);

  GST_DEBUG_OBJECT (element, "fourcc=%" GST_FOURCC_FORMAT ", size=%u",

      GST_FOURCC_ARGS (*tag), size);

  /* skip 'JUNK' chunks */

  if (*tag == GST_RIFF_TAG_JUNK) {

    size = GST_ROUND_UP_2 (size);

    *_offset += 8 + size;

    offset += 8 + size;

    GST_DEBUG_OBJECT (element, "skipping JUNK chunk");

    goto skip_junk;

  }

  if ((res = gst_pad_pull_range (pad, offset + 8, size, &buf)) != GST_FLOW_OK)

    return res;

  else if (GST_BUFFER_SIZE (buf) < size)

    goto too_small;

  *_chunk_data = buf;

  *_offset += 8 + GST_ROUND_UP_2 (size);

  return GST_FLOW_OK;

  /* ERRORS */

too_small:

  {

    /* short read, we return UNEXPECTED to mark the EOS case */

    GST_DEBUG_OBJECT (element, "not enough data (available=%u, needed=%u)",

        GST_BUFFER_SIZE (buf), size);

    gst_buffer_unref (buf);

    return GST_FLOW_UNEXPECTED;

  }

}

/**

 * gst_riff_parse_chunk:

 * @element: caller element (used for debugging).

 * @buf: input buffer.

 * @offset: offset in the buffer in the caller. Is incremented

 *          by the read size by this function.

 * @fourcc: fourcc (returned by this function0 of the chunk.

 * @chunk_data: buffer (returned by the function) containing the

 *              chunk data.

 *

 * Reads a single chunk.

 *

 * Returns: the fourcc tag of this chunk, or FALSE on error

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

gboolean

gst_riff_parse_chunk (GstElement * element, GstBuffer * buf,

    guint * _offset, guint32 * _fourcc, GstBuffer ** chunk_data)

{

  guint size, bufsize;

  guint32 fourcc;

  guint8 *data;

  guint offset = *_offset;

  g_return_val_if_fail (element != NULL, FALSE);

  g_return_val_if_fail (buf != NULL, FALSE);

  g_return_val_if_fail (_offset != NULL, FALSE);

  g_return_val_if_fail (_fourcc != NULL, FALSE);

  g_return_val_if_fail (chunk_data != NULL, FALSE);

  *chunk_data = NULL;

  *_fourcc = 0;

  bufsize = GST_BUFFER_SIZE (buf);

  if (bufsize == offset)

    goto end_offset;

  if (bufsize < offset + 8)

    goto too_small;

  /* read header */

  data = GST_BUFFER_DATA (buf) + offset;

  fourcc = GST_READ_UINT32_LE (data);

  size = GST_READ_UINT32_LE (data + 4);

  GST_DEBUG_OBJECT (element, "fourcc=%" GST_FOURCC_FORMAT ", size=%u",

      GST_FOURCC_ARGS (fourcc), size);

  if (bufsize < size + 8 + offset) {

    GST_DEBUG_OBJECT (element,

        "Needed chunk data (%d) is more than available (%d), shortcutting",

        size, bufsize - 8 - offset);

    size = bufsize - 8 - offset;

  }

  if (size)

    *chunk_data = gst_buffer_create_sub (buf, offset + 8, size);

  else

    *chunk_data = NULL;

  *_fourcc = fourcc;

  *_offset += 8 + GST_ROUND_UP_2 (size);

  return TRUE;

  /* ERRORS */

end_offset:

  {

    GST_DEBUG_OBJECT (element, "End of chunk (offset %d)", offset);

    return FALSE;

  }

too_small:

  {

    GST_DEBUG_OBJECT (element,

        "Failed to parse chunk header (offset %d, %d available, %d needed)",

        offset, bufsize, 8);

    return FALSE;

  }

}

/**

 * gst_riff_parse_file_header:

 * @element: caller element (used for debugging/error).

 * @buf: input buffer from which the file header will be parsed,

 *       should be at least 12 bytes long.

 * @doctype: a fourcc (returned by this function) to indicate the

 *           type of document (according to the header).

 *

 * Reads the first few bytes from the provided buffer, checks

 * if this stream is a RIFF stream, and determines document type.

 * This function takes ownership of @buf so it should not be used anymore

 * after calling this function.

 *

 * Returns: FALSE if this is not a RIFF stream (in which case the

 * caller should error out; we already throw an error), or TRUE

 * if it is.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

gboolean

gst_riff_parse_file_header (GstElement * element,

    GstBuffer * buf, guint32 * doctype)

{

  guint8 *data;

  guint32 tag;

  g_return_val_if_fail (buf != NULL, FALSE);

  g_return_val_if_fail (doctype != NULL, FALSE);

  if (GST_BUFFER_SIZE (buf) < 12)

    goto too_small;

  data = GST_BUFFER_DATA (buf);

  tag = GST_READ_UINT32_LE (data);

  if (tag != GST_RIFF_TAG_RIFF)

    goto not_riff;

  *doctype = GST_READ_UINT32_LE (data + 8);

  gst_buffer_unref (buf);

  return TRUE;

  /* ERRORS */

too_small:

  {

    GST_ELEMENT_ERROR (element, STREAM, WRONG_TYPE, (NULL),

        ("Not enough data to parse RIFF header (%d available, %d needed)",

            GST_BUFFER_SIZE (buf), 12));

    gst_buffer_unref (buf);

    return FALSE;

  }

not_riff:

  {

    GST_ELEMENT_ERROR (element, STREAM, WRONG_TYPE, (NULL),

        ("Stream is no RIFF stream: %" GST_FOURCC_FORMAT,

            GST_FOURCC_ARGS (tag)));

    gst_buffer_unref (buf);

    return FALSE;

  }

}

/**

 * gst_riff_parse_strh:

 * @element: caller element (used for debugging/error).

 * @buf: input data to be used for parsing, stripped from header.

 * @strh: a pointer (returned by this function) to a filled-in

 *        strh structure. Caller should free it.

 *

 * Parses a strh structure from input data. Takes ownership of @buf.

 *

 * Returns: TRUE if parsing succeeded, otherwise FALSE. The stream

 *          should be skipped on error, but it is not fatal.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

gboolean

gst_riff_parse_strh (GstElement * element,

    GstBuffer * buf, gst_riff_strh ** _strh)

{

  gst_riff_strh *strh;

  g_return_val_if_fail (buf != NULL, FALSE);

  g_return_val_if_fail (_strh != NULL, FALSE);

  if (GST_BUFFER_SIZE (buf) < sizeof (gst_riff_strh))

    goto too_small;

  strh = g_memdup (GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));

  gst_buffer_unref (buf);

#if (G_BYTE_ORDER == G_BIG_ENDIAN)

  strh->type = GUINT32_FROM_LE (strh->type);

  strh->fcc_handler = GUINT32_FROM_LE (strh->fcc_handler);

  strh->flags = GUINT32_FROM_LE (strh->flags);

  strh->priority = GUINT32_FROM_LE (strh->priority);

  strh->init_frames = GUINT32_FROM_LE (strh->init_frames);

  strh->scale = GUINT32_FROM_LE (strh->scale);

  strh->rate = GUINT32_FROM_LE (strh->rate);

  strh->start = GUINT32_FROM_LE (strh->start);

  strh->length = GUINT32_FROM_LE (strh->length);

  strh->bufsize = GUINT32_FROM_LE (strh->bufsize);

  strh->quality = GUINT32_FROM_LE (strh->quality);

  strh->samplesize = GUINT32_FROM_LE (strh->samplesize);

#endif

  /* avoid divisions by zero */

  if (!strh->scale)

    strh->scale = 1;

  if (!strh->rate)

    strh->rate = 1;

  /* debug */

  GST_INFO_OBJECT (element, "strh tag found:");

  GST_INFO_OBJECT (element, " type        %" GST_FOURCC_FORMAT,

      GST_FOURCC_ARGS (strh->type));

  GST_INFO_OBJECT (element, " fcc_handler %" GST_FOURCC_FORMAT,

      GST_FOURCC_ARGS (strh->fcc_handler));

  GST_INFO_OBJECT (element, " flags       0x%08x", strh->flags);

  GST_INFO_OBJECT (element, " priority    %d", strh->priority);

  GST_INFO_OBJECT (element, " init_frames %d", strh->init_frames);

  GST_INFO_OBJECT (element, " scale       %d", strh->scale);

  GST_INFO_OBJECT (element, " rate        %d", strh->rate);

  GST_INFO_OBJECT (element, " start       %d", strh->start);

  GST_INFO_OBJECT (element, " length      %d", strh->length);

  GST_INFO_OBJECT (element, " bufsize     %d", strh->bufsize);

  GST_INFO_OBJECT (element, " quality     %d", strh->quality);

  GST_INFO_OBJECT (element, " samplesize  %d", strh->samplesize);

  *_strh = strh;

  return TRUE;

  /* ERRORS */

too_small:

  {

    GST_ERROR_OBJECT (element,

        "Too small strh (%d available, %d needed)",

        GST_BUFFER_SIZE (buf), (int) sizeof (gst_riff_strh));

    gst_buffer_unref (buf);

    return FALSE;

  }

}

/**

 * gst_riff_parse_strf_vids:

 * @element: caller element (used for debugging/error).

 * @buf: input data to be used for parsing, stripped from header.

 * @strf: a pointer (returned by this function) to a filled-in

 *        strf/vids structure. Caller should free it.

 * @data: a pointer (returned by this function) to a buffer

 *        containing extradata for this particular stream (e.g.

 *        palette, codec initialization data).

 *

 * Parses a video stream´s strf structure plus optionally some

 * extradata from input data. This function takes ownership of @buf.

 *

 * Returns: TRUE if parsing succeeded, otherwise FALSE. The stream

 *          should be skipped on error, but it is not fatal.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

gboolean

gst_riff_parse_strf_vids (GstElement * element,

    GstBuffer * buf, gst_riff_strf_vids ** _strf, GstBuffer ** data)

{

  gst_riff_strf_vids *strf;

  g_return_val_if_fail (buf != NULL, FALSE);

  g_return_val_if_fail (_strf != NULL, FALSE);

  g_return_val_if_fail (data != NULL, FALSE);

  if (GST_BUFFER_SIZE (buf) < sizeof (gst_riff_strf_vids))

    goto too_small;

  strf = g_memdup (GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));

#if (G_BYTE_ORDER == G_BIG_ENDIAN)

  strf->size = GUINT32_FROM_LE (strf->size);

  strf->width = GUINT32_FROM_LE (strf->width);

  strf->height = GUINT32_FROM_LE (strf->height);

  strf->planes = GUINT16_FROM_LE (strf->planes);

  strf->bit_cnt = GUINT16_FROM_LE (strf->bit_cnt);

  strf->compression = GUINT32_FROM_LE (strf->compression);

  strf->image_size = GUINT32_FROM_LE (strf->image_size);

  strf->xpels_meter = GUINT32_FROM_LE (strf->xpels_meter);

  strf->ypels_meter = GUINT32_FROM_LE (strf->ypels_meter);

  strf->num_colors = GUINT32_FROM_LE (strf->num_colors);

  strf->imp_colors = GUINT32_FROM_LE (strf->imp_colors);

#endif

  /* size checking */

  *data = NULL;

  if (strf->size > GST_BUFFER_SIZE (buf)) {

    GST_WARNING_OBJECT (element,

        "strf_vids header gave %d bytes data, only %d available",

        strf->size, GST_BUFFER_SIZE (buf));

    strf->size = GST_BUFFER_SIZE (buf);

  }

  if (sizeof (gst_riff_strf_vids) < GST_BUFFER_SIZE (buf)) {

    *data = gst_buffer_create_sub (buf, sizeof (gst_riff_strf_vids),

        GST_BUFFER_SIZE (buf) - sizeof (gst_riff_strf_vids));

  }

  /* debug */

  GST_INFO_OBJECT (element, "strf tag found in context vids:");

  GST_INFO_OBJECT (element, " size        %d", strf->size);

  GST_INFO_OBJECT (element, " width       %d", strf->width);

  GST_INFO_OBJECT (element, " height      %d", strf->height);

  GST_INFO_OBJECT (element, " planes      %d", strf->planes);

  GST_INFO_OBJECT (element, " bit_cnt     %d", strf->bit_cnt);

  GST_INFO_OBJECT (element, " compression %" GST_FOURCC_FORMAT,

      GST_FOURCC_ARGS (strf->compression));

  GST_INFO_OBJECT (element, " image_size  %d", strf->image_size);

  GST_INFO_OBJECT (element, " xpels_meter %d", strf->xpels_meter);

  GST_INFO_OBJECT (element, " ypels_meter %d", strf->ypels_meter);

  GST_INFO_OBJECT (element, " num_colors  %d", strf->num_colors);

  GST_INFO_OBJECT (element, " imp_colors  %d", strf->imp_colors);

  if (*data)

    GST_INFO_OBJECT (element, " %d bytes extradata", GST_BUFFER_SIZE (*data));

  gst_buffer_unref (buf);

  *_strf = strf;

  return TRUE;

  /* ERRORS */

too_small:

  {

    GST_ERROR_OBJECT (element,

        "Too small strf_vids (%d available, %d needed)",

        GST_BUFFER_SIZE (buf), (int) sizeof (gst_riff_strf_vids));

    gst_buffer_unref (buf);

    return FALSE;

  }

}

/**

 * gst_riff_parse_strf_auds:

 * @element: caller element (used for debugging/error).

 * @buf: input data to be used for parsing, stripped from header.

 * @strf: a pointer (returned by this function) to a filled-in

 *        strf/auds structure. Caller should free it.

 * @data: a pointer (returned by this function) to a buffer

 *        containing extradata for this particular stream (e.g.

 *        codec initialization data).

 *

 * Parses an audio stream´s strf structure plus optionally some

 * extradata from input data. This function takes ownership of @buf.

 * use.

 *

 * Returns: TRUE if parsing succeeded, otherwise FALSE. The stream

 *          should be skipped on error, but it is not fatal.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

gboolean

gst_riff_parse_strf_auds (GstElement * element,

    GstBuffer * buf, gst_riff_strf_auds ** _strf, GstBuffer ** data)

{

  gst_riff_strf_auds *strf;

  guint bufsize;

  g_return_val_if_fail (buf != NULL, FALSE);

  g_return_val_if_fail (_strf != NULL, FALSE);

  g_return_val_if_fail (data != NULL, FALSE);

  bufsize = GST_BUFFER_SIZE (buf);

  if (bufsize < sizeof (gst_riff_strf_auds))

    goto too_small;

  strf = g_memdup (GST_BUFFER_DATA (buf), bufsize);

#if (G_BYTE_ORDER == G_BIG_ENDIAN)

  strf->format = GUINT16_FROM_LE (strf->format);

  strf->channels = GUINT16_FROM_LE (strf->channels);

  strf->rate = GUINT32_FROM_LE (strf->rate);

  strf->av_bps = GUINT32_FROM_LE (strf->av_bps);

  strf->blockalign = GUINT16_FROM_LE (strf->blockalign);

  strf->size = GUINT16_FROM_LE (strf->size);

#endif

  /* size checking */

  *data = NULL;

  if (bufsize > sizeof (gst_riff_strf_auds) + 2) {

    gint len;

    len = GST_READ_UINT16_LE (&GST_BUFFER_DATA (buf)[16]);

    if (len + 2 + sizeof (gst_riff_strf_auds) > bufsize) {

      GST_WARNING_OBJECT (element,

          "Extradata indicated %d bytes, but only %" G_GSSIZE_FORMAT

          " available", len, bufsize - 2 - sizeof (gst_riff_strf_auds));

      len = bufsize - 2 - sizeof (gst_riff_strf_auds);

    }

    if (len)

      *data = gst_buffer_create_sub (buf, sizeof (gst_riff_strf_auds) + 2, len);

  }

  /* debug */

  GST_INFO_OBJECT (element, "strf tag found in context auds:");

  GST_INFO_OBJECT (element, " format      %d", strf->format);

  GST_INFO_OBJECT (element, " channels    %d", strf->channels);

  GST_INFO_OBJECT (element, " rate        %d", strf->rate);

  GST_INFO_OBJECT (element, " av_bps      %d", strf->av_bps);

  GST_INFO_OBJECT (element, " blockalign  %d", strf->blockalign);

  GST_INFO_OBJECT (element, " size        %d", strf->size);

  if (*data)

    GST_INFO_OBJECT (element, " %d bytes extradata", GST_BUFFER_SIZE (*data));

  gst_buffer_unref (buf);