mirror of
https://git.ffmpeg.org/ffmpeg.git
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291 lines
9.1 KiB
C
291 lines
9.1 KiB
C
/*
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* SGI image encoder
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* Todd Kirby <doubleshot@pacbell.net>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/opt.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "codec_internal.h"
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#include "encode.h"
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#include "sgi.h"
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#include "rle.h"
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#define SGI_SINGLE_CHAN 2
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#define SGI_MULTI_CHAN 3
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typedef struct SgiContext {
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AVClass *class;
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int rle;
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} SgiContext;
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static av_cold int encode_init(AVCodecContext *avctx)
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{
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if (avctx->width > 65535 || avctx->height > 65535) {
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av_log(avctx, AV_LOG_ERROR, "Unsupported resolution %dx%d. "
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"SGI does not support resolutions above 65535x65535\n",
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avctx->width, avctx->height);
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return AVERROR_INVALIDDATA;
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}
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return 0;
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}
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static int sgi_rle_encode(PutByteContext *pbc, const uint8_t *src,
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int w, int bpp)
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{
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int val, count, x, start = bytestream2_tell_p(pbc);
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void (*bytestream2_put)(PutByteContext *, unsigned int);
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if (bpp == 1)
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bytestream2_put = bytestream2_put_byte;
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else
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bytestream2_put = bytestream2_put_be16;
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for (x = 0; x < w; x += count) {
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/* see if we can encode the next set of pixels with RLE */
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count = ff_rle_count_pixels(src, w - x, bpp, 1);
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if (count > 1) {
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if (bytestream2_get_bytes_left_p(pbc) < bpp * 2)
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return AVERROR_INVALIDDATA;
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val = bpp == 1 ? *src : AV_RB16(src);
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bytestream2_put(pbc, count);
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bytestream2_put(pbc, val);
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} else {
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int i;
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/* fall back on uncompressed */
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count = ff_rle_count_pixels(src, w - x, bpp, 0);
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if (bytestream2_get_bytes_left_p(pbc) < bpp * (count + 1))
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return AVERROR_INVALIDDATA;
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bytestream2_put(pbc, count + 0x80);
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for (i = 0; i < count; i++) {
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val = bpp == 1 ? src[i] : AV_RB16(src + i * bpp);
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bytestream2_put(pbc, val);
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}
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}
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src += count * bpp;
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}
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return bytestream2_tell_p(pbc) - start;
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}
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static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
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const AVFrame *frame, int *got_packet)
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{
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SgiContext *s = avctx->priv_data;
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const AVFrame * const p = frame;
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PutByteContext pbc;
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uint8_t *encode_buf;
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int x, y, z, length, tablesize, ret, i;
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unsigned int width, height, depth, dimension;
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unsigned int bytes_per_channel, pixmax, put_be;
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width = avctx->width;
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height = avctx->height;
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bytes_per_channel = 1;
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pixmax = 0xFF;
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put_be = HAVE_BIGENDIAN;
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switch (avctx->pix_fmt) {
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case AV_PIX_FMT_GRAY8:
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dimension = SGI_SINGLE_CHAN;
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depth = SGI_GRAYSCALE;
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break;
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case AV_PIX_FMT_RGB24:
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dimension = SGI_MULTI_CHAN;
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depth = SGI_RGB;
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break;
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case AV_PIX_FMT_RGBA:
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dimension = SGI_MULTI_CHAN;
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depth = SGI_RGBA;
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break;
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case AV_PIX_FMT_GRAY16LE:
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put_be = !HAVE_BIGENDIAN;
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case AV_PIX_FMT_GRAY16BE:
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bytes_per_channel = 2;
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pixmax = 0xFFFF;
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dimension = SGI_SINGLE_CHAN;
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depth = SGI_GRAYSCALE;
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break;
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case AV_PIX_FMT_RGB48LE:
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put_be = !HAVE_BIGENDIAN;
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case AV_PIX_FMT_RGB48BE:
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bytes_per_channel = 2;
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pixmax = 0xFFFF;
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dimension = SGI_MULTI_CHAN;
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depth = SGI_RGB;
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break;
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case AV_PIX_FMT_RGBA64LE:
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put_be = !HAVE_BIGENDIAN;
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case AV_PIX_FMT_RGBA64BE:
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bytes_per_channel = 2;
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pixmax = 0xFFFF;
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dimension = SGI_MULTI_CHAN;
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depth = SGI_RGBA;
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break;
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default:
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return AVERROR_INVALIDDATA;
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}
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tablesize = depth * height * 4;
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length = SGI_HEADER_SIZE;
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if (!s->rle)
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length += depth * height * width;
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else // assume sgi_rle_encode() produces at most 2x size of input
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length += tablesize * 2 + depth * height * (2 * width + 1);
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if ((ret = ff_alloc_packet(avctx, pkt, bytes_per_channel * length)) < 0)
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return ret;
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bytestream2_init_writer(&pbc, pkt->data, pkt->size);
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/* Encode header. */
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bytestream2_put_be16(&pbc, SGI_MAGIC);
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bytestream2_put_byte(&pbc, s->rle); /* RLE 1 - VERBATIM 0 */
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bytestream2_put_byte(&pbc, bytes_per_channel);
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bytestream2_put_be16(&pbc, dimension);
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bytestream2_put_be16(&pbc, width);
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bytestream2_put_be16(&pbc, height);
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bytestream2_put_be16(&pbc, depth);
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bytestream2_put_be32(&pbc, 0L); /* pixmin */
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bytestream2_put_be32(&pbc, pixmax);
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bytestream2_put_be32(&pbc, 0L); /* dummy */
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/* name */
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for (i = 0; i < 80; i++)
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bytestream2_put_byte(&pbc, 0L);
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/* colormap */
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bytestream2_put_be32(&pbc, 0L);
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/* The rest of the 512 byte header is unused. */
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for (i = 0; i < 404; i++)
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bytestream2_put_byte(&pbc, 0L);
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if (s->rle) {
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PutByteContext taboff_pcb, tablen_pcb;
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/* Skip RLE offset table. */
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bytestream2_init_writer(&taboff_pcb, pbc.buffer, tablesize);
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bytestream2_skip_p(&pbc, tablesize);
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/* Skip RLE length table. */
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bytestream2_init_writer(&tablen_pcb, pbc.buffer, tablesize);
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bytestream2_skip_p(&pbc, tablesize);
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/* Make an intermediate consecutive buffer. */
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if (!(encode_buf = av_malloc(width * bytes_per_channel)))
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return AVERROR(ENOMEM);
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for (z = 0; z < depth; z++) {
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const uint8_t *in_buf = p->data[0] + p->linesize[0] * (height - 1) + z * bytes_per_channel;
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for (y = 0; y < height; y++) {
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bytestream2_put_be32(&taboff_pcb, bytestream2_tell_p(&pbc));
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for (x = 0; x < width * bytes_per_channel; x += bytes_per_channel)
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if (bytes_per_channel == 1) {
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encode_buf[x] = in_buf[depth * x];
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} else if (HAVE_BIGENDIAN ^ put_be) {
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encode_buf[x + 1] = in_buf[depth * x];
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encode_buf[x] = in_buf[depth * x + 1];
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} else {
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encode_buf[x] = in_buf[depth * x];
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encode_buf[x + 1] = in_buf[depth * x + 1];
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}
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length = sgi_rle_encode(&pbc, encode_buf, width,
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bytes_per_channel);
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if (length < 1) {
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av_free(encode_buf);
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return AVERROR_INVALIDDATA;
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}
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bytestream2_put_be32(&tablen_pcb, length);
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in_buf -= p->linesize[0];
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}
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}
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av_free(encode_buf);
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} else {
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for (z = 0; z < depth; z++) {
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const uint8_t *in_buf = p->data[0] + p->linesize[0] * (height - 1) + z * bytes_per_channel;
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for (y = 0; y < height; y++) {
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for (x = 0; x < width * depth; x += depth)
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if (bytes_per_channel == 1)
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bytestream2_put_byte(&pbc, in_buf[x]);
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else
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if (put_be)
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bytestream2_put_be16(&pbc, ((uint16_t *)in_buf)[x]);
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else
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bytestream2_put_le16(&pbc, ((uint16_t *)in_buf)[x]);
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in_buf -= p->linesize[0];
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}
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}
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}
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/* total length */
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pkt->size = bytestream2_tell_p(&pbc);
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*got_packet = 1;
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return 0;
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}
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#define OFFSET(x) offsetof(SgiContext, x)
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#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
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static const AVOption options[] = {
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{ "rle", "Use run-length compression", OFFSET(rle), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, VE },
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{ NULL },
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};
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static const AVClass sgi_class = {
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.class_name = "sgi",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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const FFCodec ff_sgi_encoder = {
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.p.name = "sgi",
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CODEC_LONG_NAME("SGI image"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_SGI,
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.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
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.priv_data_size = sizeof(SgiContext),
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.p.priv_class = &sgi_class,
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.init = encode_init,
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FF_CODEC_ENCODE_CB(encode_frame),
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.p.pix_fmts = (const enum AVPixelFormat[]) {
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AV_PIX_FMT_RGB24, AV_PIX_FMT_RGBA,
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AV_PIX_FMT_RGB48LE, AV_PIX_FMT_RGB48BE,
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AV_PIX_FMT_RGBA64LE, AV_PIX_FMT_RGBA64BE,
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AV_PIX_FMT_GRAY16LE, AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_GRAY8,
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AV_PIX_FMT_NONE
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},
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};
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