Hi,
I developed an HNM4/HNM4A demuxer & video decoder for libav a while
back, and now cleaned it up.
Samples can be found here:
http://samples.mplayerhq.hu/game-formats/hnm/losteden-hnm4/
I have more samples, i can upload those if needed.
First time contributor, so if the format of the patch is wrong, or
something in the code, just tell me.
Also I think it should work on big endian platforms, but couldnt test
because i dont have access to a BE device.
libavcodec/Makefile | 1 +
libavcodec/allcodecs.c | 1 +
libavcodec/avcodec.h | 1 +
libavcodec/hnm4video.c | 483
+++++++++++++++++++++++++++++++++++++++++++++++
libavformat/Makefile | 1 +
libavformat/allformats.c | 1 +
libavformat/hnm.c | 203 ++++++++++++++++++++
7 files changed, 691 insertions(+)
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 8e0d60d..f64a56f 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -197,6 +197,7 @@ OBJS-$(CONFIG_H264_DECODER) +=
h264.o \
h264_loopfilter.o
h264_direct.o \
cabac.o h264_sei.o
h264_ps.o \
h264_refs.o h264_cavlc.o
h264_cabac.o
+OBJS-$(CONFIG_HNM4_VIDEO_DECODER) += hnm4video.o
OBJS-$(CONFIG_HUFFYUV_DECODER) += huffyuv.o huffyuvdec.o
OBJS-$(CONFIG_HUFFYUV_ENCODER) += huffyuv.o huffyuvenc.o
OBJS-$(CONFIG_IAC_DECODER) += imc.o
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index 55d7957..b62efb9 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -153,6 +153,7 @@ void avcodec_register_all(void)
REGISTER_DECODER(H263I, h263i);
REGISTER_ENCODER(H263P, h263p);
REGISTER_DECODER(H264, h264);
+ REGISTER_DECODER(HNM4_VIDEO, hnm4_video);
REGISTER_ENCDEC (HUFFYUV, huffyuv);
REGISTER_DECODER(IDCIN, idcin);
REGISTER_DECODER(IFF_BYTERUN1, iff_byterun1);
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index d535308..ae0bfe2 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -274,6 +274,7 @@ enum AVCodecID {
AV_CODEC_ID_ESCAPE130,
AV_CODEC_ID_G2M,
AV_CODEC_ID_WEBP,
+ AV_CODEC_ID_HNM4_VIDEO,
/* various PCM "codecs" */
AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at
the start of audio codecs
diff --git a/libavcodec/hnm4video.c b/libavcodec/hnm4video.c
new file mode 100644
index 0000000..d8d0c39
--- /dev/null
+++ b/libavcodec/hnm4video.c
@@ -0,0 +1,483 @@
+/*
+ * Cryo Interactive Entertainment HNM4 video decoder
+ * Copyright (c) 2012 David Kment
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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,
+ * 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
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
+ */
+
+#include "avcodec.h"
+#include "internal.h"
+#include "libavutil/internal.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/mem.h"
+#include <string.h>
+
+#define HNM4_CHUNK_ID_PL 19536
+#define HNM4_CHUNK_ID_IZ 23113
+#define HNM4_CHUNK_ID_IU 21833
+#define HNM4_CHUNK_ID_SD 17491
+
+typedef struct Hnm4VideoContext {
+
+ uint8_t version;
+ uint16_t width;
+ uint16_t height;
+
+ uint8_t *current;
+ uint8_t *previous;
+ uint8_t *buffer1;
+ uint8_t *buffer2;
+ uint8_t *processed;
+ uint8_t *palette;
+} Hnm4VideoContext;
+
+static int getbit(uint8_t *src, uint32_t *brBitsRemaining, uint32_t
*brOffset, uint32_t *brQueue) {
+
+ if (*brBitsRemaining == 0) {
+
+ *brQueue = AV_RL32(src + *brOffset);
+ *brOffset += 4;
+ *brBitsRemaining = 32;
+ }
+
+ (*brBitsRemaining)--;
+
+ if (*brQueue & 0x80000000) {
+ *brQueue <<= 1;
+ return 1;
+ }
+ else {
+ *brQueue <<= 1;
+ return 0;
+ }
+}
+
+static void unpack_intraframe(Hnm4VideoContext *hnm, uint8_t *src) {
+
+ uint32_t brBitsRemaining;
+ uint32_t brOffset;
+ uint32_t brQueue;
+
+ uint32_t outputOffset, count, offset;
+ uint16_t word;
+
+ outputOffset = 0;
+ brBitsRemaining = 0;
+ brQueue = 0;
+ brOffset = 0;
+
+ while(1) {
+
+ if (getbit(src, &brBitsRemaining, &brOffset, &brQueue)) {
+
+ hnm->current[outputOffset++] = src[brOffset++];
+
+ } else {
+
+ if (getbit(src, &brBitsRemaining, &brOffset, &brQueue)) {
+
+ word = src[brOffset++];
+ word += src[brOffset++] * 256;
+ count = word & 0x07;
+ offset = 0xffffe000 | (word >> 3);
+
+ if (!count) {count = src[brOffset++];}
+
+ if (!count) {return;}
+
+ } else {
+ count = getbit(src, &brBitsRemaining, &brOffset,
&brQueue) << 1;
+ count |= getbit(src, &brBitsRemaining, &brOffset,
&brQueue);
+
+ offset = 0xffffff00 | src[brOffset++];
+ }
+
+ count += 2;
+
+ offset += outputOffset;
+
+ while (count--) {
+ hnm->current[outputOffset++] = hnm->current[offset++];
+ }
+ }
+ }
+}
+
+static void postprocess_current_frame(Hnm4VideoContext *hnm) {
+
+ uint32_t x, y;
+ uint32_t srcX, srcY;
+
+ for(y = 0; y < hnm->height; y++) {
+ srcY = y - (y % 2);
+ srcX = srcY * hnm->width + (y % 2);
+ for(x = 0; x < hnm->width; x++) {
+ hnm->processed[(y * hnm->width) + x] = hnm->current[srcX];
+ srcX += 2;
+ }
+ }
+}
+
+static void copy_processed_frame(Hnm4VideoContext *hnm, AVFrame *frame) {
+
+ uint32_t x, y, srcX;
+
+ for(y = 0; y < hnm->height; y++) {
+ srcX = y * hnm->width;
+ for(x = 0; x < hnm->width; x++) {
+ frame->data[0][(y * frame->linesize[0]) + x] =
hnm->processed[srcX++];
+ }
+ }
+}
+
+static void decode_interframe_v4(Hnm4VideoContext *hnm, uint8_t *src) {
+
+ uint32_t readOffset, writeOffset;
+ uint8_t tag;
+ uint32_t count, left;
+ uint8_t previous, backline, backward, swap;
+ int32_t offset;
+
+ readOffset = 0;
+ writeOffset = 0;
+
+ while(1) {
+
+ count = src[readOffset] & 0x1F;
+
+ if(count == 0) {
+
+ tag = src[readOffset++] & 0xE0;
+ tag = tag >> 5;
+
+ if(tag == 0) {
+ hnm->current[writeOffset++] = src[readOffset++];
+ hnm->current[writeOffset++] = src[readOffset++];
+ } else if(tag == 1) {
+ writeOffset += src[readOffset++] * 2;
+ } else if(tag == 2) {
+ count = src[readOffset++];
+ count += src[readOffset++] * 256;
+ count *= 2;
+ writeOffset += count;
+ } else if(tag == 3) {
+ count = src[readOffset++] * 2;
+ while(count > 0) {
+ hnm->current[writeOffset++] = src[readOffset];
+ count--;
+ }
+ readOffset++;
+ } else {
+ break;
+ }
+
+ } else {
+
+ previous = src[readOffset] & 0x20;
+ backline = src[readOffset] & 0x40;
+ backward = src[readOffset] & 0x80;
+ swap = src[readOffset+1] & 0x01;
+
+ offset = src[readOffset+1];
+ offset += src[readOffset+2] * 256;
+ offset = (offset >> 1) & 0x7FFF;
+ offset = writeOffset + (offset * 2) - 0x8000;
+
+ left = count;
+
+ if(previous) {
+ while(left > 0) {
+ if(backline) {
+ hnm->current[writeOffset++] =
hnm->previous[offset-(2 * hnm->width)+1];
+ hnm->current[writeOffset++] =
hnm->previous[offset++];
+ offset++;
+ } else {
+ hnm->current[writeOffset++] =
hnm->previous[offset++];
+ hnm->current[writeOffset++] =
hnm->previous[offset++];
+ }
+ if(backward) {offset -= 4;}
+ left--;
+ }
+ } else {
+ while(left > 0) {
+ if(backline) {
+ hnm->current[writeOffset++] =
hnm->current[offset-(2 * hnm->width)+1];
+ hnm->current[writeOffset++] =
hnm->current[offset++];
+ offset++;
+ } else {
+ hnm->current[writeOffset++] =
hnm->current[offset++];
+ hnm->current[writeOffset++] =
hnm->current[offset++];
+ }
+ if(backward) {offset -= 4;}
+ left--;
+ }
+ }
+
+ if(swap) {
+ left = count;
+ writeOffset -= count * 2;
+ while(left > 0) {
+ swap = hnm->current[writeOffset];
+ hnm->current[writeOffset] =
hnm->current[writeOffset + 1];
+ hnm->current[writeOffset + 1] = swap;
+ left--;
+ writeOffset += 2;
+ }
+ }
+
+ readOffset += 3;
+ }
+ }
+}
+
+static void decode_interframe_v4a(Hnm4VideoContext *hnm, uint8_t *src) {
+
+ uint32_t readOffset, writeOffset;
+ uint8_t tag, count;
+ uint8_t previous, delta;
+ uint32_t offset;
+
+ readOffset = 0;
+ writeOffset = 0;
+
+ while(1) {
+
+ count = src[readOffset] & 0x3F;
+
+ if(count == 0) {
+
+ tag = src[readOffset++] & 0xC0;
+ tag = tag >> 6;
+
+ if(tag == 0) {
+ writeOffset += src[readOffset++];
+ } else if(tag == 1) {
+ hnm->current[writeOffset] = src[readOffset++];
+ hnm->current[writeOffset + hnm->width] = src[readOffset++];
+ writeOffset++;
+ } else if(tag == 2) {
+ writeOffset += hnm->width;
+ } else if(tag == 3) {
+ break;
+ }
+
+ } else {
+
+ delta = src[readOffset] & 0x80;
+ previous = src[readOffset] & 0x40;
+
+ offset = writeOffset;
+ offset += src[readOffset + 1];
+ offset += src[readOffset + 2] * 256;
+
+ if(delta) {offset -= 0x10000;}
+
+ if(previous) {
+ while(count > 0) {
+ hnm->current[writeOffset] = hnm->previous[offset];
+ hnm->current[writeOffset + hnm->width] =
hnm->previous[offset + hnm->width];
+ writeOffset++;
+ offset++;
+ count--;
+ }
+ } else {
+ while(count > 0) {
+ hnm->current[writeOffset] = hnm->current[offset];
+ hnm->current[writeOffset + hnm->width] =
hnm->current[offset + hnm->width];
+ writeOffset++;
+ offset++;
+ count--;
+ }
+ }
+
+ readOffset += 3;
+ }
+ }
+}
+
+static void hnm_update_palette(Hnm4VideoContext *hnm, uint8_t *src) {
+
+ uint16_t start, count;
+ uint8_t r, g, b;
+ uint32_t readOffset, writeOffset;
+ int eightBitColors;
+
+ readOffset = 8; // skip first 8 bytes
+ writeOffset = 0;
+
+ eightBitColors = (src[7] & 0x80 && hnm->version == 0x4a);
+
+ while(1) {
+
+ start = src[readOffset++];
+ count = src[readOffset++];
+
+ if(start == 255 && count == 255) {break;}
+
+ if(count == 0) {count = 256;}
+
+ writeOffset = start * 4;
+
+ while(count > 0) {
+ r = src[readOffset++];
+ g = src[readOffset++];
+ b = src[readOffset++];
+
+ if(!eightBitColors) {
+ r <<= 2;
+ g <<= 2;
+ b <<= 2;
+ }
+
+ hnm->palette[writeOffset++] = b;
+ hnm->palette[writeOffset++] = g;
+ hnm->palette[writeOffset++] = r;
+ hnm->palette[writeOffset++] = 0;
+ count--;
+ }
+ }
+}
+
+static void hnm_flip_buffers(Hnm4VideoContext *hnm) {
+
+ uint8_t *temp;
+
+ temp = hnm->current;
+ hnm->current = hnm->previous;
+ hnm->previous = temp;
+}
+
+static int hnm_decode_frame(AVCodecContext *avctx, void *data,
+ int *got_frame, AVPacket *avpkt) {
+
+ AVFrame *frame = data;
+ Hnm4VideoContext *hnm = avctx->priv_data;
+ int ret;
+ uint16_t chunk_id;
+
+ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ return ret;
+ }
+
+ chunk_id = AV_RL16(avpkt->data + 4);
+
+ if(chunk_id == HNM4_CHUNK_ID_PL) {
+
+ hnm_update_palette(hnm, avpkt->data);
+ }
+ else if(chunk_id == HNM4_CHUNK_ID_IZ) {
+
+ unpack_intraframe(hnm, avpkt->data + 12);
+
+ memcpy(hnm->previous, hnm->current, hnm->width * hnm->height);
+
+ if(hnm->version == 0x4a) {
+ memcpy(hnm->processed, hnm->current, hnm->width * hnm->height);
+ } else {
+ postprocess_current_frame(hnm);
+ }
+
+ copy_processed_frame(hnm, frame);
+
+ frame->pict_type = AV_PICTURE_TYPE_I;
+ frame->key_frame = 1;
+
+ frame->palette_has_changed = 1;
+ memcpy(frame->data[1], hnm->palette, 256 * 4);
+
+ *got_frame = 1;
+ }
+ else if(chunk_id == HNM4_CHUNK_ID_IU) {
+
+ if(hnm->version == 0x4a) {
+ decode_interframe_v4a(hnm, avpkt->data + 8);
+ memcpy(hnm->processed, hnm->current, hnm->width * hnm->height);
+ } else {
+ decode_interframe_v4(hnm, avpkt->data + 8);
+ postprocess_current_frame(hnm);
+ }
+
+ copy_processed_frame(hnm, frame);
+
+ frame->pict_type = AV_PICTURE_TYPE_P;
+ frame->key_frame = 0;
+
+ frame->palette_has_changed = 1;
+ memcpy(frame->data[1], hnm->palette, 256 * 4);
+
+ *got_frame = 1;
+
+ hnm_flip_buffers(hnm);
+ }
+ else {
+ av_log(avctx, AV_LOG_ERROR, "invalid chunk id: %d\n", chunk_id);
+ return AVERROR(EINVAL);
+ }
+
+ return avpkt->size;
+}
+
+static av_cold int hnm_decode_init(AVCodecContext *avctx) {
+
+ Hnm4VideoContext *hnm = avctx->priv_data;
+
+ hnm->buffer1 = av_mallocz(avctx->width * avctx->height);
+ hnm->buffer2 = av_mallocz(avctx->width * avctx->height);
+ hnm->processed = av_mallocz(avctx->width * avctx->height);
+ hnm->palette = av_mallocz(256 * 4);
+
+ if(hnm->buffer1 == NULL || hnm->buffer2 == NULL
+ || hnm->processed == NULL || hnm->palette == NULL) {
+ av_log(avctx, AV_LOG_ERROR, "av_mallocz() failed\n");
+ return AVERROR(ENOMEM);
+ }
+
+ hnm->current = hnm->buffer1;
+ hnm->previous = hnm->buffer2;
+
+ avctx->pix_fmt = AV_PIX_FMT_PAL8;
+ hnm->version = avctx->extradata[0];
+ hnm->width = avctx->width;
+ hnm->height = avctx->height;
+
+ return 0;
+}
+
+static av_cold int hnm_decode_end(AVCodecContext *avctx) {
+
+ Hnm4VideoContext *hnm = avctx->priv_data;
+
+ av_free(hnm->buffer1);
+ av_free(hnm->buffer2);
+ av_free(hnm->processed);
+ av_free(hnm->palette);
+
+ return 0;
+}
+
+AVCodec ff_hnm4_video_decoder = {
+ .name = "hnm4video",
+ .long_name = NULL_IF_CONFIG_SMALL("HNM 4 video"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_HNM4_VIDEO,
+ .priv_data_size = sizeof(Hnm4VideoContext),
+ .init = hnm_decode_init,
+ .close = hnm_decode_end,
+ .decode = hnm_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
+};
diff --git a/libavformat/Makefile b/libavformat/Makefile
index f12b493..3ac30eb 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -141,6 +141,7 @@ OBJS-$(CONFIG_H264_DEMUXER) +=
h264dec.o rawdec.o
OBJS-$(CONFIG_H264_MUXER) += rawenc.o
OBJS-$(CONFIG_HLS_DEMUXER) += hls.o
OBJS-$(CONFIG_HLS_MUXER) += hlsenc.o
+OBJS-$(CONFIG_HNM_DEMUXER) += hnm.o
OBJS-$(CONFIG_IDCIN_DEMUXER) += idcin.o
OBJS-$(CONFIG_IFF_DEMUXER) += iff.o
OBJS-$(CONFIG_ILBC_DEMUXER) += ilbc.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 585cf43..289639e 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -118,6 +118,7 @@ void av_register_all(void)
REGISTER_MUXDEMUX(H263, h263);
REGISTER_MUXDEMUX(H264, h264);
REGISTER_MUXDEMUX(HLS, hls);
+ REGISTER_DEMUXER (HNM, hnm);
REGISTER_DEMUXER (IDCIN, idcin);
REGISTER_DEMUXER (IFF, iff);
REGISTER_MUXDEMUX(ILBC, ilbc);
diff --git a/libavformat/hnm.c b/libavformat/hnm.c
new file mode 100644
index 0000000..6c80c69
--- /dev/null
+++ b/libavformat/hnm.c
@@ -0,0 +1,203 @@
+/*
+ * Cryo Interactive Entertainment HNM4 demuxer
+ * Copyright (c) 2012 David Kment
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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,
+ * 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
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
+ */
+
+#include "avformat.h"
+#include "internal.h"
+#include "libavutil/intreadwrite.h"
+
+#define HNM4_TAG MKTAG('H', 'N', 'M', '4')
+
+#define HNM4_SAMPLE_RATE 22050
+#define HNM4_FRAME_FPS 24
+
+#define HNM4_CHUNK_ID_PL 19536
+#define HNM4_CHUNK_ID_IZ 23113
+#define HNM4_CHUNK_ID_IU 21833
+#define HNM4_CHUNK_ID_SD 17491
+
+typedef struct Hnm4DemuxContext {
+
+ uint8_t version;
+ uint16_t width;
+ uint16_t height;
+ uint32_t filesize;
+ uint32_t frames;
+ uint32_t taboffset;
+ uint16_t bits;
+ uint16_t channels;
+ uint32_t framesize;
+ uint32_t currentframe;
+
+ int64_t pts;
+
+ uint32_t superchunk_remaining;
+
+ AVPacket vpkt;
+
+} Hnm4DemuxContext;
+
+static int hnm_probe(AVProbeData *p)
+{
+ if(p->buf_size < 4) {
+ return 0;
+ }
+
+ // check for HNM4 header
+ if(AV_RL32(&p->buf[0]) == HNM4_TAG) {
+ return AVPROBE_SCORE_MAX;
+ }
+
+ return 0;
+}
+
+static int hnm_read_header(AVFormatContext *s)
+{
+ Hnm4DemuxContext *hnm = s->priv_data;
+ AVIOContext *pb = s->pb;
+ AVStream *vst;
+
+ /* default context members */
+ hnm->pts = 0;
+ av_init_packet(&hnm->vpkt);
+ hnm->vpkt.data = NULL; hnm->vpkt.size = 0;
+
+ hnm->superchunk_remaining = 0;
+
+ avio_skip(pb, 8);
+ hnm->width = avio_rl16(pb);
+ hnm->height = avio_rl16(pb);
+ hnm->filesize = avio_rl32(pb);
+ hnm->frames = avio_rl32(pb);
+ hnm->taboffset = avio_rl32(pb);
+ hnm->bits = avio_rl16(pb);
+ hnm->channels = avio_rl16(pb);
+ hnm->framesize = avio_rl32(pb);
+ avio_skip(pb, 32);
+
+ hnm->currentframe = 0;
+
+ // TODO: find a better way to detect HNM4A
+ if(hnm->width >= 640) {
+ hnm->version = 0x4a;
+ } else {
+ hnm->version = 0x40;
+ }
+
+ if (!(vst = avformat_new_stream(s, NULL)))
+ return AVERROR(ENOMEM);
+
+ vst->codec->extradata = av_mallocz(1);
+ vst->codec->extradata_size = 1;
+ memcpy(vst->codec->extradata, &hnm->version, 1);
+ vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+ vst->codec->codec_id = AV_CODEC_ID_HNM4_VIDEO;
+ vst->codec->codec_tag = 0;
+ vst->codec->width = hnm->width;
+ vst->codec->height = hnm->height;
+
+ vst->start_time = 0;
+
+ avpriv_set_pts_info(vst, 33, 1, HNM4_FRAME_FPS);
+
+ return 0;
+}
+
+static int hnm_read_packet(AVFormatContext *s,
+ AVPacket *pkt)
+{
+ Hnm4DemuxContext *hnm = s->priv_data;
+ AVIOContext *pb = s->pb;
+ int ret = 0;
+
+ uint32_t superchunk_size;
+ uint32_t chunk_size;
+ uint16_t chunk_id;
+
+ if(hnm->currentframe == hnm->frames) {
+ return AVERROR(EPIPE);
+ }
+
+ if(pb->eof_reached || (int) avio_tell(pb) >= hnm->filesize) {
+ return AVERROR(EPIPE);
+ }
+
+ if(hnm->superchunk_remaining == 0) {
+
+ /* parse next superchunk */
+ superchunk_size = avio_rl24(pb);
+ avio_skip(pb, 1);
+
+ hnm->superchunk_remaining = superchunk_size - 4;
+ }
+
+ chunk_size = avio_rl24(pb);
+ avio_skip(pb, 1);
+ chunk_id = avio_rl16(pb);
+ avio_skip(pb, 2);
+
+ switch(chunk_id) {
+
+ case HNM4_CHUNK_ID_PL:
+ case HNM4_CHUNK_ID_IZ:
+ case HNM4_CHUNK_ID_IU:
+ avio_seek(pb, -8, SEEK_CUR);
+ ret += av_get_packet(pb, pkt, chunk_size);
+ hnm->superchunk_remaining -= chunk_size;
+ if(chunk_id == HNM4_CHUNK_ID_IZ || chunk_id ==
HNM4_CHUNK_ID_IU) {
+ hnm->currentframe++;
+ }
+ break;
+
+ case HNM4_CHUNK_ID_SD:
+ avio_skip(pb, chunk_size - 8);
+ hnm->superchunk_remaining -= chunk_size;
+ break;
+
+ default:
+ av_log(s, AV_LOG_WARNING, "unknown chunk found: %d, offset:
%d\n", chunk_id, (int) avio_tell(pb));
+ avio_skip(pb, chunk_size - 8);
+ hnm->superchunk_remaining -= chunk_size;
+ break;
+ }
+
+ return ret;
+}
+
+static int hnm_read_close(AVFormatContext *s)
+{
+ Hnm4DemuxContext *hnm = s->priv_data;
+
+ if (hnm->vpkt.size > 0)
+ av_free_packet(&hnm->vpkt);
+
+ return 0;
+}
+
+AVInputFormat ff_hnm_demuxer = {
+ .name = "hnm4movie",
+ .long_name = NULL_IF_CONFIG_SMALL("HNM4 movie"),
+ .priv_data_size = sizeof(Hnm4DemuxContext),
+ .read_probe = hnm_probe,
+ .read_header = hnm_read_header,
+ .read_packet = hnm_read_packet,
+ .read_close = hnm_read_close,
+ .flags = AVFMT_NO_BYTE_SEEK
+};
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