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-rw-r--r--ffmpeg/libavcodec/ffv1.c221
1 files changed, 221 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/ffv1.c b/ffmpeg/libavcodec/ffv1.c
new file mode 100644
index 0000000..404b0e3
--- /dev/null
+++ b/ffmpeg/libavcodec/ffv1.c
@@ -0,0 +1,221 @@
+/*
+ * FFV1 codec for libavcodec
+ *
+ * Copyright (c) 2003-2012 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * FF Video Codec 1 (a lossless codec)
+ */
+
+#include "libavutil/avassert.h"
+#include "libavutil/crc.h"
+#include "libavutil/opt.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/pixdesc.h"
+#include "libavutil/timer.h"
+#include "avcodec.h"
+#include "internal.h"
+#include "rangecoder.h"
+#include "golomb.h"
+#include "mathops.h"
+#include "ffv1.h"
+
+av_cold int ffv1_common_init(AVCodecContext *avctx)
+{
+ FFV1Context *s = avctx->priv_data;
+
+ if (!avctx->width || !avctx->height)
+ return AVERROR_INVALIDDATA;
+
+ s->avctx = avctx;
+ s->flags = avctx->flags;
+
+ avcodec_get_frame_defaults(&s->picture);
+
+ ff_dsputil_init(&s->dsp, avctx);
+
+ s->width = avctx->width;
+ s->height = avctx->height;
+
+ // defaults
+ s->num_h_slices = 1;
+ s->num_v_slices = 1;
+
+ return 0;
+}
+
+int ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs)
+{
+ int j;
+
+ fs->plane_count = f->plane_count;
+ fs->transparency = f->transparency;
+ for (j = 0; j < f->plane_count; j++) {
+ PlaneContext *const p = &fs->plane[j];
+
+ if (fs->ac) {
+ if (!p->state)
+ p->state = av_malloc(CONTEXT_SIZE * p->context_count *
+ sizeof(uint8_t));
+ if (!p->state)
+ return AVERROR(ENOMEM);
+ } else {
+ if (!p->vlc_state)
+ p->vlc_state = av_malloc(p->context_count * sizeof(VlcState));
+ if (!p->vlc_state)
+ return AVERROR(ENOMEM);
+ }
+ }
+
+ if (fs->ac > 1) {
+ //FIXME only redo if state_transition changed
+ for (j = 1; j < 256; j++) {
+ fs->c. one_state[ j] = f->state_transition[j];
+ fs->c.zero_state[256 - j] = 256 - fs->c.one_state[j];
+ }
+ }
+
+ return 0;
+}
+
+int ffv1_init_slices_state(FFV1Context *f)
+{
+ int i, ret;
+ for (i = 0; i < f->slice_count; i++) {
+ FFV1Context *fs = f->slice_context[i];
+ if ((ret = ffv1_init_slice_state(f, fs)) < 0)
+ return AVERROR(ENOMEM);
+ }
+ return 0;
+}
+
+av_cold int ffv1_init_slice_contexts(FFV1Context *f)
+{
+ int i;
+
+ f->slice_count = f->num_h_slices * f->num_v_slices;
+ av_assert0(f->slice_count > 0);
+
+ for (i = 0; i < f->slice_count; i++) {
+ FFV1Context *fs = av_mallocz(sizeof(*fs));
+ int sx = i % f->num_h_slices;
+ int sy = i / f->num_h_slices;
+ int sxs = f->avctx->width * sx / f->num_h_slices;
+ int sxe = f->avctx->width * (sx + 1) / f->num_h_slices;
+ int sys = f->avctx->height * sy / f->num_v_slices;
+ int sye = f->avctx->height * (sy + 1) / f->num_v_slices;
+
+ if (!fs)
+ return AVERROR(ENOMEM);
+
+ f->slice_context[i] = fs;
+ memcpy(fs, f, sizeof(*fs));
+ memset(fs->rc_stat2, 0, sizeof(fs->rc_stat2));
+
+ fs->slice_width = sxe - sxs;
+ fs->slice_height = sye - sys;
+ fs->slice_x = sxs;
+ fs->slice_y = sys;
+
+ fs->sample_buffer = av_malloc(3 * MAX_PLANES * (fs->width + 6) *
+ sizeof(*fs->sample_buffer));
+ if (!fs->sample_buffer)
+ return AVERROR(ENOMEM);
+ }
+ return 0;
+}
+
+int ffv1_allocate_initial_states(FFV1Context *f)
+{
+ int i;
+
+ for (i = 0; i < f->quant_table_count; i++) {
+ f->initial_states[i] = av_malloc(f->context_count[i] *
+ sizeof(*f->initial_states[i]));
+ if (!f->initial_states[i])
+ return AVERROR(ENOMEM);
+ memset(f->initial_states[i], 128,
+ f->context_count[i] * sizeof(*f->initial_states[i]));
+ }
+ return 0;
+}
+
+void ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs)
+{
+ int i, j;
+
+ for (i = 0; i < f->plane_count; i++) {
+ PlaneContext *p = &fs->plane[i];
+
+ p->interlace_bit_state[0] = 128;
+ p->interlace_bit_state[1] = 128;
+
+ if (fs->ac) {
+ if (f->initial_states[p->quant_table_index]) {
+ memcpy(p->state, f->initial_states[p->quant_table_index],
+ CONTEXT_SIZE * p->context_count);
+ } else
+ memset(p->state, 128, CONTEXT_SIZE * p->context_count);
+ } else {
+ for (j = 0; j < p->context_count; j++) {
+ p->vlc_state[j].drift = 0;
+ p->vlc_state[j].error_sum = 4; //FFMAX((RANGE + 32)/64, 2);
+ p->vlc_state[j].bias = 0;
+ p->vlc_state[j].count = 1;
+ }
+ }
+ }
+}
+
+
+av_cold int ffv1_close(AVCodecContext *avctx)
+{
+ FFV1Context *s = avctx->priv_data;
+ int i, j;
+
+ av_frame_unref(&s->last_picture);
+
+ for (j = 0; j < s->slice_count; j++) {
+ FFV1Context *fs = s->slice_context[j];
+ for (i = 0; i < s->plane_count; i++) {
+ PlaneContext *p = &fs->plane[i];
+
+ av_freep(&p->state);
+ av_freep(&p->vlc_state);
+ }
+ av_freep(&fs->sample_buffer);
+ }
+
+ av_freep(&avctx->stats_out);
+ for (j = 0; j < s->quant_table_count; j++) {
+ av_freep(&s->initial_states[j]);
+ for (i = 0; i < s->slice_count; i++) {
+ FFV1Context *sf = s->slice_context[i];
+ av_freep(&sf->rc_stat2[j]);
+ }
+ av_freep(&s->rc_stat2[j]);
+ }
+
+ for (i = 0; i < s->slice_count; i++)
+ av_freep(&s->slice_context[i]);
+
+ return 0;
+}
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