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ffmpeg/libavcodec/sgienc.c

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/*
* SGI image encoder
* Todd Kirby <doubleshot@pacbell.net>
*
* 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/opt.h"
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
#include "sgi.h"
#include "rle.h"
#define SGI_SINGLE_CHAN 2
#define SGI_MULTI_CHAN 3
typedef struct SgiContext {
AVClass *class;
int rle;
} SgiContext;
static av_cold int encode_init(AVCodecContext *avctx)
{
if (avctx->width > 65535 || avctx->height > 65535) {
av_log(avctx, AV_LOG_ERROR, "Unsupported resolution %dx%d. "
"SGI does not support resolutions above 65535x65535\n",
avctx->width, avctx->height);
return AVERROR_INVALIDDATA;
}
return 0;
}
static int sgi_rle_encode(PutByteContext *pbc, const uint8_t *src,
int w, int bpp)
{
int val, count, x, start = bytestream2_tell_p(pbc);
void (*bytestream2_put)(PutByteContext *, unsigned int);
if (bpp == 1)
bytestream2_put = bytestream2_put_byte;
else
bytestream2_put = bytestream2_put_be16;
for (x = 0; x < w; x += count) {
/* see if we can encode the next set of pixels with RLE */
count = ff_rle_count_pixels(src, w - x, bpp, 1);
if (count > 1) {
if (bytestream2_get_bytes_left_p(pbc) < bpp * 2)
return AVERROR_INVALIDDATA;
val = bpp == 1 ? *src : AV_RB16(src);
bytestream2_put(pbc, count);
bytestream2_put(pbc, val);
} else {
int i;
/* fall back on uncompressed */
count = ff_rle_count_pixels(src, w - x, bpp, 0);
if (bytestream2_get_bytes_left_p(pbc) < bpp * (count + 1))
return AVERROR_INVALIDDATA;
bytestream2_put(pbc, count + 0x80);
for (i = 0; i < count; i++) {
val = bpp == 1 ? src[i] : AV_RB16(src + i * bpp);
bytestream2_put(pbc, val);
}
}
src += count * bpp;
}
return bytestream2_tell_p(pbc) - start;
}
static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *frame, int *got_packet)
{
SgiContext *s = avctx->priv_data;
const AVFrame * const p = frame;
PutByteContext pbc;
uint8_t *in_buf, *encode_buf;
int x, y, z, length, tablesize, ret, i;
unsigned int width, height, depth, dimension;
unsigned int bytes_per_channel, pixmax, put_be;
#if FF_API_CODED_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
avctx->coded_frame->key_frame = 1;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
#if FF_API_CODER_TYPE
FF_DISABLE_DEPRECATION_WARNINGS
if (avctx->coder_type == FF_CODER_TYPE_RAW)
s->rle = 0;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
width = avctx->width;
height = avctx->height;
bytes_per_channel = 1;
pixmax = 0xFF;
put_be = HAVE_BIGENDIAN;
switch (avctx->pix_fmt) {
case AV_PIX_FMT_GRAY8:
dimension = SGI_SINGLE_CHAN;
depth = SGI_GRAYSCALE;
break;
case AV_PIX_FMT_RGB24:
dimension = SGI_MULTI_CHAN;
depth = SGI_RGB;
break;
case AV_PIX_FMT_RGBA:
dimension = SGI_MULTI_CHAN;
depth = SGI_RGBA;
break;
case AV_PIX_FMT_GRAY16LE:
put_be = !HAVE_BIGENDIAN;
case AV_PIX_FMT_GRAY16BE:
bytes_per_channel = 2;
pixmax = 0xFFFF;
dimension = SGI_SINGLE_CHAN;
depth = SGI_GRAYSCALE;
break;
case AV_PIX_FMT_RGB48LE:
put_be = !HAVE_BIGENDIAN;
case AV_PIX_FMT_RGB48BE:
bytes_per_channel = 2;
pixmax = 0xFFFF;
dimension = SGI_MULTI_CHAN;
depth = SGI_RGB;
break;
case AV_PIX_FMT_RGBA64LE:
put_be = !HAVE_BIGENDIAN;
case AV_PIX_FMT_RGBA64BE:
bytes_per_channel = 2;
pixmax = 0xFFFF;
dimension = SGI_MULTI_CHAN;
depth = SGI_RGBA;
break;
default:
return AVERROR_INVALIDDATA;
}
tablesize = depth * height * 4;
length = SGI_HEADER_SIZE;
if (!s->rle)
length += depth * height * width;
else // assume sgi_rle_encode() produces at most 2x size of input
length += tablesize * 2 + depth * height * (2 * width + 1);
if ((ret = ff_alloc_packet2(avctx, pkt, bytes_per_channel * length, 0)) < 0)
return ret;
bytestream2_init_writer(&pbc, pkt->data, pkt->size);
/* Encode header. */
bytestream2_put_be16(&pbc, SGI_MAGIC);
bytestream2_put_byte(&pbc, s->rle); /* RLE 1 - VERBATIM 0 */
bytestream2_put_byte(&pbc, bytes_per_channel);
bytestream2_put_be16(&pbc, dimension);
bytestream2_put_be16(&pbc, width);
bytestream2_put_be16(&pbc, height);
bytestream2_put_be16(&pbc, depth);
bytestream2_put_be32(&pbc, 0L); /* pixmin */
bytestream2_put_be32(&pbc, pixmax);
bytestream2_put_be32(&pbc, 0L); /* dummy */
/* name */
for (i = 0; i < 80; i++)
bytestream2_put_byte(&pbc, 0L);
/* colormap */
bytestream2_put_be32(&pbc, 0L);
/* The rest of the 512 byte header is unused. */
for (i = 0; i < 404; i++)
bytestream2_put_byte(&pbc, 0L);
if (s->rle) {
PutByteContext taboff_pcb, tablen_pcb;
/* Skip RLE offset table. */
bytestream2_init_writer(&taboff_pcb, pbc.buffer, tablesize);
bytestream2_skip_p(&pbc, tablesize);
/* Skip RLE length table. */
bytestream2_init_writer(&tablen_pcb, pbc.buffer, tablesize);
bytestream2_skip_p(&pbc, tablesize);
/* Make an intermediate consecutive buffer. */
if (!(encode_buf = av_malloc(width * bytes_per_channel)))
return AVERROR(ENOMEM);
for (z = 0; z < depth; z++) {
in_buf = p->data[0] + p->linesize[0] * (height - 1) + z * bytes_per_channel;
for (y = 0; y < height; y++) {
bytestream2_put_be32(&taboff_pcb, bytestream2_tell_p(&pbc));
for (x = 0; x < width * bytes_per_channel; x += bytes_per_channel)
if (bytes_per_channel == 1) {
encode_buf[x] = in_buf[depth * x];
} else if (HAVE_BIGENDIAN ^ put_be) {
encode_buf[x + 1] = in_buf[depth * x];
encode_buf[x] = in_buf[depth * x + 1];
} else {
encode_buf[x] = in_buf[depth * x];
encode_buf[x + 1] = in_buf[depth * x + 1];
}
length = sgi_rle_encode(&pbc, encode_buf, width,
bytes_per_channel);
if (length < 1) {
av_free(encode_buf);
return AVERROR_INVALIDDATA;
}
bytestream2_put_be32(&tablen_pcb, length);
in_buf -= p->linesize[0];
}
}
av_free(encode_buf);
} else {
for (z = 0; z < depth; z++) {
in_buf = p->data[0] + p->linesize[0] * (height - 1) + z * bytes_per_channel;
for (y = 0; y < height; y++) {
for (x = 0; x < width * depth; x += depth)
if (bytes_per_channel == 1)
bytestream2_put_byte(&pbc, in_buf[x]);
else
if (put_be)
bytestream2_put_be16(&pbc, ((uint16_t *)in_buf)[x]);
else
bytestream2_put_le16(&pbc, ((uint16_t *)in_buf)[x]);
in_buf -= p->linesize[0];
}
}
}
/* total length */
pkt->size = bytestream2_tell_p(&pbc);
pkt->flags |= AV_PKT_FLAG_KEY;
*got_packet = 1;
return 0;
}
#define OFFSET(x) offsetof(SgiContext, x)
#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "rle", "Use run-length compression", OFFSET(rle), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, VE },
{ NULL },
};
static const AVClass sgi_class = {
.class_name = "sgi",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVCodec ff_sgi_encoder = {
.name = "sgi",
.long_name = NULL_IF_CONFIG_SMALL("SGI image"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_SGI,
.priv_data_size = sizeof(SgiContext),
.priv_class = &sgi_class,
.init = encode_init,
.encode2 = encode_frame,
.pix_fmts = (const enum AVPixelFormat[]) {
AV_PIX_FMT_RGB24, AV_PIX_FMT_RGBA,
AV_PIX_FMT_RGB48LE, AV_PIX_FMT_RGB48BE,
AV_PIX_FMT_RGBA64LE, AV_PIX_FMT_RGBA64BE,
AV_PIX_FMT_GRAY16LE, AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_GRAY8,
AV_PIX_FMT_NONE
},
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
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