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Implement YOP demuxer and video decoder. 

Patch by Mohamed Naufal gmailify(naufal11).

Originally committed as revision 22724 to svn://svn.ffmpeg.org/ffmpeg/trunk
tags/v0.6
Mohamed Naufal Stefano Sabatini 16 years ago
parent
30ad1a6651
commit
148bcae98c
9 changed files with 485 additions and 2 deletions
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  1. +2
    -0
      doc/general.texi
  2. +1
    -0
      libavcodec/Makefile
  3. +1
    -0
      libavcodec/allcodecs.c
  4. +2
    -1
      libavcodec/avcodec.h
  5. +260
    -0
      libavcodec/yop.c
  6. +1
    -0
      libavformat/Makefile
  7. +1
    -0
      libavformat/allformats.c
  8. +1
    -1
      libavformat/avformat.h
  9. +216
    -0
      libavformat/yop.c

+ 2
- 0
doc/general.texi View File

@@ -241,6 +241,7 @@ library:
@item Westwood Studios VQA @tab @tab X
@tab Multimedia format used in Westwood Studios games.
@item YUV4MPEG pipe @tab X @tab X
@item Psygnosis YOP @tab @tab X
@end multitable

@code{X} means that encoding (resp. decoding) is supported.
@@ -490,6 +491,7 @@ following image formats are supported:
@item Winnov WNV1 @tab @tab X
@item WMV7 @tab X @tab X
@item YAMAHA SMAF @tab X @tab X
@item Psygnosis YOP Video @tab @tab X
@item ZLIB @tab X @tab X
@tab part of LCL, encoder experimental
@item Zip Motion Blocks Video @tab X @tab X


+ 1
- 0
libavcodec/Makefile View File

@@ -386,6 +386,7 @@ OBJS-$(CONFIG_XAN_WC4_DECODER) += xan.o
OBJS-$(CONFIG_XL_DECODER) += xl.o
OBJS-$(CONFIG_XSUB_DECODER) += xsubdec.o
OBJS-$(CONFIG_XSUB_ENCODER) += xsubenc.o
OBJS-$(CONFIG_YOP_DECODER) += yop.o
OBJS-$(CONFIG_ZLIB_DECODER) += lcldec.o
OBJS-$(CONFIG_ZLIB_ENCODER) += lclenc.o
OBJS-$(CONFIG_ZMBV_DECODER) += zmbv.o


+ 1
- 0
libavcodec/allcodecs.c View File

@@ -207,6 +207,7 @@ void avcodec_register_all(void)
REGISTER_DECODER (WNV1, wnv1);
REGISTER_DECODER (XAN_WC3, xan_wc3);
REGISTER_DECODER (XL, xl);
REGISTER_DECODER (YOP, yop);
REGISTER_ENCDEC (ZLIB, zlib);
REGISTER_ENCDEC (ZMBV, zmbv);



+ 2
- 1
libavcodec/avcodec.h View File

@@ -30,7 +30,7 @@
#include "libavutil/avutil.h"

#define LIBAVCODEC_VERSION_MAJOR 52
#define LIBAVCODEC_VERSION_MINOR 61
#define LIBAVCODEC_VERSION_MINOR 62
#define LIBAVCODEC_VERSION_MICRO 0

#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
@@ -209,6 +209,7 @@ enum CodecID {
CODEC_ID_IFF_ILBM,
CODEC_ID_IFF_BYTERUN1,
CODEC_ID_KGV1,
CODEC_ID_YOP,

/* various PCM "codecs" */
CODEC_ID_PCM_S16LE= 0x10000,


+ 260
- 0
libavcodec/yop.c View File

@@ -0,0 +1,260 @@
/**
* @file libavcodec/yop.c
* Psygnosis YOP decoder
*
* Copyright (C) 2010 Mohamed Naufal Basheer <naufal11@gmail.com>
* derived from the code by
* Copyright (C) 2009 Thomas P. Higdon <thomas.p.higdon@gmail.com>
*
* This file is part of FFmpeg.
*
* 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.
*
* 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

#include "libavutil/intreadwrite.h"

#include "avcodec.h"
#include "get_bits.h"

typedef struct YopDecContext {
AVFrame frame;
AVCodecContext *avctx;

int num_pal_colors;
int first_color[2];
int frame_data_length;
int row_pos;

uint8_t *low_nibble;
uint8_t *srcptr;
uint8_t *dstptr;
uint8_t *dstbuf;
} YopDecContext;

// These tables are taken directly from:
// http://wiki.multimedia.cx/index.php?title=Psygnosis_YOP

/**
* Lookup table for painting macroblocks. Bytes 0-2 of each entry contain
* the macroblock positions to be painted (taken as (0, B0, B1, B2)).
* Byte 3 contains the number of bytes consumed on the input,
* equal to max(bytes 0-2) + 1.
*/
static const uint8_t paint_lut[15][4] =
{{1, 2, 3, 4}, {1, 2, 0, 3},
{1, 2, 1, 3}, {1, 2, 2, 3},
{1, 0, 2, 3}, {1, 0, 0, 2},
{1, 0, 1, 2}, {1, 1, 2, 3},
{0, 1, 2, 3}, {0, 1, 0, 2},
{1, 1, 0, 2}, {0, 1, 1, 2},
{0, 0, 1, 2}, {0, 0, 0, 1},
{1, 1, 1, 2},
};

/**
* Lookup table for copying macroblocks. Each entry contains the respective
* x and y pixel offset for the copy source.
*/
static const int8_t motion_vector[16][2] =
{{-4, -4}, {-2, -4},
{ 0, -4}, { 2, -4},
{-4, -2}, {-4, 0},
{-3, -3}, {-1, -3},
{ 1, -3}, { 3, -3},
{-3, -1}, {-2, -2},
{ 0, -2}, { 2, -2},
{ 4, -2}, {-2, 0},
};

static av_cold int yop_decode_init(AVCodecContext *avctx)
{
YopDecContext *s = avctx->priv_data;
s->avctx = avctx;

if (avctx->width & 1 || avctx->height & 1 ||
avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
av_log(avctx, AV_LOG_ERROR, "YOP has invalid dimensions\n");
return -1;
}

avctx->pix_fmt = PIX_FMT_PAL8;

s->num_pal_colors = avctx->extradata[0];
s->first_color[0] = avctx->extradata[1];
s->first_color[1] = avctx->extradata[2];

if (s->num_pal_colors + s->first_color[0] > 256 ||
s->num_pal_colors + s->first_color[1] > 256) {
av_log(avctx, AV_LOG_ERROR,
"YOP: palette parameters invalid, header probably corrupt\n");
return AVERROR_INVALIDDATA;
}

return 0;
}

static av_cold int yop_decode_close(AVCodecContext *avctx)
{
YopDecContext *s = avctx->priv_data;
if (s->frame.data[0])
avctx->release_buffer(avctx, &s->frame);
return 0;
}

/**
* Paints a macroblock using the pattern in paint_lut.
* @param s codec context
* @param tag the tag that was in the nibble
*/
static void yop_paint_block(YopDecContext *s, int tag)
{
s->dstptr[0] = s->srcptr[0];
s->dstptr[1] = s->srcptr[paint_lut[tag][0]];
s->dstptr[s->frame.linesize[0]] = s->srcptr[paint_lut[tag][1]];
s->dstptr[s->frame.linesize[0] + 1] = s->srcptr[paint_lut[tag][2]];

// The number of src bytes consumed is in the last part of the lut entry.
s->srcptr += paint_lut[tag][3];
}

/**
* Copies a previously painted macroblock to the current_block.
* @param copy_tag the tag that was in the nibble
*/
static int yop_copy_previous_block(YopDecContext *s, int copy_tag)
{
uint8_t *bufptr;

// Calculate position for the copy source
bufptr = s->dstptr + motion_vector[copy_tag][0] +
s->frame.linesize[0] * motion_vector[copy_tag][1];
if (bufptr < s->dstbuf) {
av_log(s->avctx, AV_LOG_ERROR,
"YOP: cannot decode, file probably corrupt\n");
return AVERROR_INVALIDDATA;
}

s->dstptr[0] = bufptr[0];
s->dstptr[1] = bufptr[1];
s->dstptr[s->frame.linesize[0]] = bufptr[s->frame.linesize[0]];
s->dstptr[s->frame.linesize[0] + 1] = bufptr[s->frame.linesize[0] + 1];

return 0;
}

/**
* Returns the next nibble in sequence, consuming a new byte on the input
* only if necessary.
*/
static uint8_t yop_get_next_nibble(YopDecContext *s)
{
int ret;

if (s->low_nibble) {
ret = *s->low_nibble & 0xf;
s->low_nibble = NULL;
}else {
s->low_nibble = s->srcptr++;
ret = *s->low_nibble >> 4;
}
return ret;
}

/**
* Takes s->dstptr to the next macroblock in sequence.
*/
static void yop_next_macroblock(YopDecContext *s)
{
// If we are advancing to the next row of macroblocks
if (s->row_pos == s->frame.linesize[0] - 2) {
s->dstptr += s->frame.linesize[0];
s->row_pos = 0;
}else {
s->row_pos += 2;
}
s->dstptr += 2;
}

static int yop_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
AVPacket *avpkt)
{
YopDecContext *s = avctx->priv_data;
int tag, firstcolor, is_odd_frame;
int ret, i;
uint32_t *palette;

if (s->frame.data[0])
avctx->release_buffer(avctx, &s->frame);

ret = avctx->get_buffer(avctx, &s->frame);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
}

s->frame.linesize[0] = avctx->width;

s->dstbuf = s->frame.data[0];
s->dstptr = s->frame.data[0];
s->srcptr = avpkt->data + 4;
s->row_pos = 0;
s->low_nibble = NULL;

is_odd_frame = avpkt->data[0];
firstcolor = s->first_color[is_odd_frame];
palette = (uint32_t *)s->frame.data[1];

for (i = 0; i < s->num_pal_colors; i++, s->srcptr += 3)
palette[i + firstcolor] = (s->srcptr[0] << 18) |
(s->srcptr[1] << 10) |
(s->srcptr[2] << 2);

s->frame.palette_has_changed = 1;

while (s->dstptr - s->dstbuf <
avctx->width * avctx->height &&
s->srcptr - avpkt->data < avpkt->size) {

tag = yop_get_next_nibble(s);

if (tag != 0xf) {
yop_paint_block(s, tag);
}else {
tag = yop_get_next_nibble(s);
ret = yop_copy_previous_block(s, tag);
if (ret < 0) {
avctx->release_buffer(avctx, &s->frame);
return ret;
}
}
yop_next_macroblock(s);
}

*data_size = sizeof(AVFrame);
*(AVFrame *) data = s->frame;
return avpkt->size;
}

AVCodec yop_decoder = {
"yop",
CODEC_TYPE_VIDEO,
CODEC_ID_YOP,
sizeof(YopDecContext),
yop_decode_init,
NULL,
yop_decode_close,
yop_decode_frame,
.long_name = NULL_IF_CONFIG_SMALL("Psygnosis YOP Video"),
};

+ 1
- 0
libavformat/Makefile View File

@@ -260,6 +260,7 @@ OBJS-$(CONFIG_WSAUD_DEMUXER) += westwood.o
OBJS-$(CONFIG_WSVQA_DEMUXER) += westwood.o
OBJS-$(CONFIG_WV_DEMUXER) += wv.o apetag.o id3v1.o
OBJS-$(CONFIG_XA_DEMUXER) += xa.o
OBJS-$(CONFIG_YOP_DEMUXER) += yop.o
OBJS-$(CONFIG_YUV4MPEGPIPE_MUXER) += yuv4mpeg.o
OBJS-$(CONFIG_YUV4MPEGPIPE_DEMUXER) += yuv4mpeg.o



+ 1
- 0
libavformat/allformats.c View File

@@ -207,6 +207,7 @@ void av_register_all(void)
REGISTER_DEMUXER (WSVQA, wsvqa);
REGISTER_DEMUXER (WV, wv);
REGISTER_DEMUXER (XA, xa);
REGISTER_DEMUXER (YOP, yop);
REGISTER_MUXDEMUX (YUV4MPEGPIPE, yuv4mpegpipe);

/* external libraries */


+ 1
- 1
libavformat/avformat.h View File

@@ -22,7 +22,7 @@
#define AVFORMAT_AVFORMAT_H

#define LIBAVFORMAT_VERSION_MAJOR 52
#define LIBAVFORMAT_VERSION_MINOR 58
#define LIBAVFORMAT_VERSION_MINOR 59
#define LIBAVFORMAT_VERSION_MICRO 0

#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \


+ 216
- 0
libavformat/yop.c View File

@@ -0,0 +1,216 @@
/**
* @file libavformat/yop.c
* Psygnosis YOP demuxer
*
* Copyright (C) 2010 Mohamed Naufal Basheer <naufal11@gmail.com>
* derived from the code by
* Copyright (C) 2009 Thomas P. Higdon <thomas.p.higdon@gmail.com>
*
* This file is part of FFmpeg.
*
* 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.
*
* 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

#include "libavutil/intreadwrite.h"
#include "avformat.h"

typedef struct yop_dec_context {
AVPacket video_packet;

int odd_frame;
int frame_size;
int audio_block_length;
int palette_size;
} YopDecContext;

static int yop_probe(AVProbeData *probe_packet)
{
if (AV_RB16(probe_packet->buf) == AV_RB16("YO") &&
probe_packet->buf[6] &&
probe_packet->buf[7] &&
!(probe_packet->buf[8] & 1) &&
!(probe_packet->buf[10] & 1))
return AVPROBE_SCORE_MAX * 3 / 4;

return 0;
}

static int yop_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
YopDecContext *yop = s->priv_data;
ByteIOContext *pb = s->pb;

AVCodecContext *audio_dec, *video_dec;
AVStream *audio_stream, *video_stream;

int frame_rate, ret;

audio_stream = av_new_stream(s, 0);
video_stream = av_new_stream(s, 1);

// Extra data that will be passed to the decoder
video_stream->codec->extradata_size = 8;

video_stream->codec->extradata = av_mallocz(video_stream->codec->extradata_size +
FF_INPUT_BUFFER_PADDING_SIZE);

if (!video_stream->codec->extradata)
return AVERROR(ENOMEM);

// Audio
audio_dec = audio_stream->codec;
audio_dec->codec_type = CODEC_TYPE_AUDIO;
audio_dec->codec_id = CODEC_ID_ADPCM_IMA_WS;
audio_dec->channels = 1;
audio_dec->sample_rate = 22050;

// Video
video_dec = video_stream->codec;
video_dec->codec_type = CODEC_TYPE_VIDEO;
video_dec->codec_id = CODEC_ID_YOP;

url_fskip(pb, 6);

frame_rate = get_byte(pb);
yop->frame_size = get_byte(pb) * 2048;
video_dec->width = get_le16(pb);
video_dec->height = get_le16(pb);

video_stream->sample_aspect_ratio = (AVRational){1, 2};

ret = get_buffer(pb, video_dec->extradata, 8);
if (ret < 8)
return ret < 0 ? ret : AVERROR_EOF;

yop->palette_size = video_dec->extradata[0] * 3 + 4;
yop->audio_block_length = AV_RL16(video_dec->extradata + 6);

// 1840 samples per frame, 1 nibble per sample; hence 1840/2 = 920
if (yop->audio_block_length < 920 ||
yop->audio_block_length + yop->palette_size >= yop->frame_size) {
av_log(s, AV_LOG_ERROR, "YOP has invalid header\n");
return AVERROR_INVALIDDATA;
}

url_fseek(pb, 2048, SEEK_SET);

av_set_pts_info(video_stream, 32, 1, frame_rate);

return 0;
}

static int yop_read_packet(AVFormatContext *s, AVPacket *pkt)
{
YopDecContext *yop = s->priv_data;
ByteIOContext *pb = s->pb;

int ret;
int actual_video_data_size = yop->frame_size -
yop->audio_block_length - yop->palette_size;

yop->video_packet.stream_index = 1;

if (yop->video_packet.data) {
*pkt = yop->video_packet;
yop->video_packet.data = NULL;
yop->video_packet.size = 0;
pkt->data[0] = yop->odd_frame;
pkt->flags |= PKT_FLAG_KEY;
yop->odd_frame ^= 1;
return pkt->size;
}
ret = av_new_packet(&yop->video_packet,
yop->frame_size - yop->audio_block_length);
if (ret < 0)
return ret;

yop->video_packet.pos = url_ftell(pb);

ret = get_buffer(pb, yop->video_packet.data, yop->palette_size);
if (ret < 0) {
goto err_out;
}else if (ret < yop->palette_size) {
ret = AVERROR_EOF;
goto err_out;
}

ret = av_get_packet(pb, pkt, 920);
if (ret < 0)
goto err_out;

// Set position to the start of the frame
pkt->pos = yop->video_packet.pos;

url_fskip(pb, yop->audio_block_length - ret);

ret = get_buffer(pb, yop->video_packet.data + yop->palette_size,
actual_video_data_size);
if (ret < 0)
goto err_out;
else if (ret < actual_video_data_size)
av_shrink_packet(&yop->video_packet, yop->palette_size + ret);

// Arbitrarily return the audio data first
return yop->audio_block_length;

err_out:
av_free_packet(&yop->video_packet);
return ret;
}

static int yop_read_close(AVFormatContext *s)
{
YopDecContext *yop = s->priv_data;
av_free_packet(&yop->video_packet);
return 0;
}

static int yop_read_seek(AVFormatContext *s, int stream_index,
int64_t timestamp, int flags)
{
YopDecContext *yop = s->priv_data;
int64_t frame_pos, pos_min, pos_max;
int frame_count;

av_free_packet(&yop->video_packet);

if (!stream_index)
return -1;

pos_min = s->data_offset;
pos_max = url_fsize(s->pb) - yop->frame_size;
frame_count = (pos_max - pos_min) / yop->frame_size;

timestamp = FFMAX(0, FFMIN(frame_count, timestamp));

frame_pos = timestamp * yop->frame_size + pos_min;
yop->odd_frame = timestamp & 1;

url_fseek(s->pb, frame_pos, SEEK_SET);
return 0;
}

AVInputFormat yop_demuxer = {
"yop",
NULL_IF_CONFIG_SMALL("Psygnosis YOP Format"),
sizeof(YopDecContext),
yop_probe,
yop_read_header,
yop_read_packet,
yop_read_close,
yop_read_seek,
.extensions = "yop",
.flags = AVFMT_GENERIC_INDEX,
};

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