/*
- * IFF (.iff) file demuxer
* Copyright (c) 2008 Jaikrishnan Menon <realityman@gmx.net>
* Copyright (c) 2010 Peter Ross <pross@xvid.org>
* Copyright (c) 2010 Sebastian Vater <cdgs.basty@googlemail.com>
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * FFmpeg 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.
*
- * Libav is distributed in the hope that it will be useful,
+ * FFmpeg 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 Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
* http://wiki.multimedia.cx/index.php?title=IFF
*/
+#include "libavcodec/bytestream.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/dict.h"
#include "avformat.h"
#define ID_PBM MKTAG('P','B','M',' ')
#define ID_ILBM MKTAG('I','L','B','M')
#define ID_BMHD MKTAG('B','M','H','D')
+#define ID_CAMG MKTAG('C','A','M','G')
#define ID_CMAP MKTAG('C','M','A','P')
#define ID_FORM MKTAG('F','O','R','M')
#define RIGHT 4
#define STEREO 6
-#define PACKET_SIZE 1024
+/**
+ * This number of bytes if added at the beginning of each AVPacket
+ * which contain additional information about video properties
+ * which has to be shared between demuxer and decoder.
+ * This number may change between frames, e.g. the demuxer might
+ * set it to smallest possible size of 2 to indicate that there's
+ * no extradata changing in this frame.
+ */
+#define IFF_EXTRA_VIDEO_SIZE 9
typedef enum {
COMP_NONE,
uint32_t body_size;
uint32_t sent_bytes;
uint32_t audio_frame_count;
+ svx8_compression_type svx8_compression;
+ bitmap_compression_type bitmap_compression; ///< delta compression method used
+ unsigned bpp; ///< bits per plane to decode (differs from bits_per_coded_sample if HAM)
+ unsigned ham; ///< 0 if non-HAM or number of hold bits (6 for bpp > 6, 4 otherwise)
+ unsigned flags; ///< 1 for EHB, 0 is no extra half darkening
+ unsigned transparency; ///< transparency color index in palette
+ unsigned masking; ///< masking method used
} IffDemuxContext;
-
-static void interleave_stereo(const uint8_t *src, uint8_t *dest, int size)
-{
- uint8_t *end = dest + size;
- size = size>>1;
-
- while(dest < end) {
- *dest++ = *src;
- *dest++ = *(src+size);
- src++;
- }
-}
-
/* Metadata string read */
static int get_metadata(AVFormatContext *s,
const char *const tag,
IffDemuxContext *iff = s->priv_data;
AVIOContext *pb = s->pb;
AVStream *st;
+ uint8_t *buf;
uint32_t chunk_id, data_size;
- int compression = -1;
+ uint32_t screenmode = 0;
+ unsigned transparency = 0;
+ unsigned masking = 0; // no mask
st = av_new_stream(s, 0);
if (!st)
// codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content
st->codec->codec_tag = avio_rl32(pb);
- while(!pb->eof_reached) {
+ while(!url_feof(pb)) {
uint64_t orig_pos;
int res;
const char *metadata_tag = NULL;
st->codec->sample_rate = avio_rb16(pb);
if (data_size >= 16) {
avio_skip(pb, 1);
- compression = avio_r8(pb);
+ iff->svx8_compression = avio_r8(pb);
}
break;
st->codec->channels = (avio_rb32(pb) < 6) ? 1 : 2;
break;
+ case ID_CAMG:
+ if (data_size < 4)
+ return AVERROR_INVALIDDATA;
+ screenmode = avio_rb32(pb);
+ break;
+
case ID_CMAP:
- st->codec->extradata_size = data_size;
- st->codec->extradata = av_malloc(data_size);
+ st->codec->extradata_size = data_size + IFF_EXTRA_VIDEO_SIZE;
+ st->codec->extradata = av_malloc(data_size + IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
if (!st->codec->extradata)
return AVERROR(ENOMEM);
- if (avio_read(pb, st->codec->extradata, data_size) < 0)
+ if (avio_read(pb, st->codec->extradata + IFF_EXTRA_VIDEO_SIZE, data_size) < 0)
return AVERROR(EIO);
break;
case ID_BMHD:
+ iff->bitmap_compression = -1;
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
if (data_size <= 8)
return AVERROR_INVALIDDATA;
st->codec->height = avio_rb16(pb);
avio_skip(pb, 4); // x, y offset
st->codec->bits_per_coded_sample = avio_r8(pb);
- if (data_size >= 11) {
- avio_skip(pb, 1); // masking
- compression = avio_r8(pb);
+ if (data_size >= 10)
+ masking = avio_r8(pb);
+ if (data_size >= 11)
+ iff->bitmap_compression = avio_r8(pb);
+ if (data_size >= 14) {
+ avio_skip(pb, 1); // padding
+ transparency = avio_rb16(pb);
}
if (data_size >= 16) {
- avio_skip(pb, 3); // paddding, transparent
st->sample_aspect_ratio.num = avio_r8(pb);
st->sample_aspect_ratio.den = avio_r8(pb);
}
break;
case ID_ANNO:
- case ID_TEXT:
- metadata_tag = "comment";
- break;
-
- case ID_AUTH:
- metadata_tag = "artist";
- break;
-
- case ID_COPYRIGHT:
- metadata_tag = "copyright";
- break;
-
- case ID_NAME:
- metadata_tag = "title";
- break;
+ case ID_TEXT: metadata_tag = "comment"; break;
+ case ID_AUTH: metadata_tag = "artist"; break;
+ case ID_COPYRIGHT: metadata_tag = "copyright"; break;
+ case ID_NAME: metadata_tag = "title"; break;
}
if (metadata_tag) {
case AVMEDIA_TYPE_AUDIO:
av_set_pts_info(st, 32, 1, st->codec->sample_rate);
- switch(compression) {
+ switch (iff->svx8_compression) {
case COMP_NONE:
- st->codec->codec_id = CODEC_ID_PCM_S8;
+ st->codec->codec_id = CODEC_ID_8SVX_RAW;
break;
case COMP_FIB:
st->codec->codec_id = CODEC_ID_8SVX_FIB;
st->codec->codec_id = CODEC_ID_8SVX_EXP;
break;
default:
- av_log(s, AV_LOG_ERROR, "unknown compression method\n");
+ av_log(s, AV_LOG_ERROR,
+ "Unknown SVX8 compression method '%d'\n", iff->svx8_compression);
return -1;
}
- st->codec->bits_per_coded_sample = 8;
+ st->codec->bits_per_coded_sample = iff->svx8_compression == COMP_NONE ? 8 : 4;
st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample;
st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
break;
case AVMEDIA_TYPE_VIDEO:
- switch (compression) {
+ iff->bpp = st->codec->bits_per_coded_sample;
+ if ((screenmode & 0x800 /* Hold And Modify */) && iff->bpp <= 8) {
+ iff->ham = iff->bpp > 6 ? 6 : 4;
+ st->codec->bits_per_coded_sample = 24;
+ }
+ iff->flags = (screenmode & 0x80 /* Extra HalfBrite */) && iff->bpp <= 8;
+ iff->masking = masking;
+ iff->transparency = transparency;
+
+ if (!st->codec->extradata) {
+ st->codec->extradata_size = IFF_EXTRA_VIDEO_SIZE;
+ st->codec->extradata = av_malloc(IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
+ if (!st->codec->extradata)
+ return AVERROR(ENOMEM);
+ }
+ buf = st->codec->extradata;
+ bytestream_put_be16(&buf, IFF_EXTRA_VIDEO_SIZE);
+ bytestream_put_byte(&buf, iff->bitmap_compression);
+ bytestream_put_byte(&buf, iff->bpp);
+ bytestream_put_byte(&buf, iff->ham);
+ bytestream_put_byte(&buf, iff->flags);
+ bytestream_put_be16(&buf, iff->transparency);
+ bytestream_put_byte(&buf, iff->masking);
+
+ switch (iff->bitmap_compression) {
case BITMAP_RAW:
st->codec->codec_id = CODEC_ID_IFF_ILBM;
break;
st->codec->codec_id = CODEC_ID_IFF_BYTERUN1;
break;
default:
- av_log(s, AV_LOG_ERROR, "unknown compression method\n");
+ av_log(s, AV_LOG_ERROR,
+ "Unknown bitmap compression method '%d'\n", iff->bitmap_compression);
return AVERROR_INVALIDDATA;
}
break;
if(iff->sent_bytes >= iff->body_size)
return AVERROR(EIO);
- if(st->codec->channels == 2) {
- uint8_t sample_buffer[PACKET_SIZE];
+ if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
+ ret = av_get_packet(pb, pkt, iff->body_size);
+ } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
+ uint8_t *buf;
- ret = avio_read(pb, sample_buffer, PACKET_SIZE);
- if(av_new_packet(pkt, PACKET_SIZE) < 0) {
- av_log(s, AV_LOG_ERROR, "cannot allocate packet\n");
+ if (av_new_packet(pkt, iff->body_size + 2) < 0) {
return AVERROR(ENOMEM);
}
- interleave_stereo(sample_buffer, pkt->data, PACKET_SIZE);
- } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
- ret = av_get_packet(pb, pkt, iff->body_size);
+
+ buf = pkt->data;
+ bytestream_put_be16(&buf, 2);
+ ret = avio_read(pb, buf, iff->body_size);
} else {
- ret = av_get_packet(pb, pkt, PACKET_SIZE);
+ av_abort();
}
if(iff->sent_bytes == 0)
pkt->flags |= AV_PKT_FLAG_KEY;
+ iff->sent_bytes = iff->body_size;
- if(st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
- iff->sent_bytes += PACKET_SIZE;
- } else {
- iff->sent_bytes = iff->body_size;
- }
pkt->stream_index = 0;
- if(st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
- pkt->pts = iff->audio_frame_count;
- iff->audio_frame_count += ret / st->codec->channels;
- }
return ret;
}
projects / ffmpeg / blobdiff