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This is possible, because every given FFCodec has to implement exactly one of these. Doing so decreases sizeof(FFCodec) and therefore decreases the size of the binary. Notice that in case of position-independent code the decrease is in .data.rel.ro, so that this translates to decreased memory consumption. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
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 *in_buf, *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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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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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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.p.long_name = NULL_IF_CONFIG_SMALL("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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.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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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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