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vp9: add superframe merging bitstream filter.
Fixes ticket 4313.
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Original file line number | Diff line number | Diff line change |
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/* | ||
* Vp9 invisible (alt-ref) frame to superframe merge bitstream filter | ||
* Copyright (c) 2016 Ronald S. Bultje <rsbultje@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 | ||
*/ | ||
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#include "libavutil/avassert.h" | ||
#include "avcodec.h" | ||
#include "get_bits.h" | ||
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#define MAX_CACHE 8 | ||
typedef struct VP9BSFContext { | ||
int n_cache; | ||
struct CachedBuf { | ||
uint8_t *data; | ||
int size; | ||
} cache[MAX_CACHE]; | ||
} VP9BSFContext; | ||
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static void stats(const struct CachedBuf *in, int n_in, | ||
unsigned *_max, unsigned *_sum) | ||
{ | ||
int n; | ||
unsigned max = 0, sum = 0; | ||
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for (n = 0; n < n_in; n++) { | ||
unsigned sz = in[n].size; | ||
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if (sz > max) | ||
max = sz; | ||
sum += sz; | ||
} | ||
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*_max = max; | ||
*_sum = sum; | ||
} | ||
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static int merge_superframe(const struct CachedBuf *in, int n_in, | ||
uint8_t **poutbuf, int *poutbuf_size) | ||
{ | ||
unsigned max, sum, mag, marker, n, sz; | ||
uint8_t *ptr; | ||
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stats(in, n_in, &max, &sum); | ||
mag = av_log2(max) >> 3; | ||
marker = 0xC0 + (mag << 3) + (n_in - 1); | ||
sz = *poutbuf_size = sum + 2 + (mag + 1) * n_in; | ||
ptr = *poutbuf = av_malloc(sz); | ||
if (!ptr) | ||
return AVERROR(ENOMEM); | ||
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for (n = 0; n < n_in; n++) { | ||
memcpy(ptr, in[n].data, in[n].size); | ||
ptr += in[n].size; | ||
} | ||
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#define wloop(mag, wr) \ | ||
for (n = 0; n < n_in; n++) { \ | ||
wr; \ | ||
ptr += mag + 1; \ | ||
} | ||
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// write superframe with marker 110[mag:2][nframes:3] | ||
*ptr++ = marker; | ||
switch (mag) { | ||
case 0: | ||
wloop(mag, *ptr = in[n].size); | ||
break; | ||
case 1: | ||
wloop(mag, AV_WB16(ptr, in[n].size)); | ||
break; | ||
case 2: | ||
wloop(mag, AV_WB24(ptr, in[n].size)); | ||
break; | ||
case 3: | ||
wloop(mag, AV_WB32(ptr, in[n].size)); | ||
break; | ||
} | ||
*ptr++ = marker; | ||
av_assert0(ptr == &(*poutbuf)[*poutbuf_size]); | ||
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return 0; | ||
} | ||
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static int vp9_superframe_filter(AVBitStreamFilterContext *bsfc, | ||
AVCodecContext *avctx, const char *args, | ||
uint8_t **poutbuf, int *poutbuf_size, | ||
const uint8_t *buf, int buf_size, | ||
int keyframe) | ||
{ | ||
GetBitContext gb; | ||
VP9BSFContext *ctx = bsfc->priv_data; | ||
int res, invisible, profile, marker, uses_superframe_syntax = 0, n; | ||
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marker = buf[buf_size - 1]; | ||
if ((marker & 0xe0) == 0xc0) { | ||
int nbytes = 1 + ((marker >> 3) & 0x3); | ||
int n_frames = 1 + (marker & 0x7), idx_sz = 2 + n_frames * nbytes; | ||
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uses_superframe_syntax = buf_size >= idx_sz && buf[buf_size - idx_sz] == marker; | ||
} | ||
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if ((res = init_get_bits8(&gb, buf, buf_size)) < 0) | ||
return res; | ||
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get_bits(&gb, 2); // frame marker | ||
profile = get_bits1(&gb); | ||
profile |= get_bits1(&gb) << 1; | ||
if (profile == 3) profile += get_bits1(&gb); | ||
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if (get_bits1(&gb)) { | ||
invisible = 0; | ||
} else { | ||
get_bits1(&gb); // keyframe | ||
invisible = !get_bits1(&gb); | ||
} | ||
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if (uses_superframe_syntax && ctx->n_cache > 0) { | ||
av_log(avctx, AV_LOG_ERROR, | ||
"Mixing of superframe syntax and naked VP9 frames not supported"); | ||
return AVERROR_INVALIDDATA; | ||
} else if ((!invisible || uses_superframe_syntax) && !ctx->n_cache) { | ||
// passthrough | ||
*poutbuf = (uint8_t *) buf; | ||
*poutbuf_size = buf_size; | ||
return 0; | ||
} else if (ctx->n_cache + 1 >= MAX_CACHE) { | ||
av_log(avctx, AV_LOG_ERROR, | ||
"Too many invisible frames"); | ||
return AVERROR_INVALIDDATA; | ||
} | ||
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ctx->cache[ctx->n_cache].size = buf_size; | ||
if (invisible && !uses_superframe_syntax) { | ||
ctx->cache[ctx->n_cache].data = av_malloc(buf_size); | ||
if (!ctx->cache[ctx->n_cache].data) | ||
return AVERROR(ENOMEM); | ||
memcpy(ctx->cache[ctx->n_cache++].data, buf, buf_size); | ||
*poutbuf = NULL; | ||
*poutbuf_size = 0; | ||
return 0; | ||
} | ||
av_assert0(ctx->n_cache > 0); | ||
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ctx->cache[ctx->n_cache].data = (uint8_t *) buf; | ||
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// build superframe | ||
if ((res = merge_superframe(ctx->cache, ctx->n_cache + 1, | ||
poutbuf, poutbuf_size)) < 0) | ||
return res; | ||
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for (n = 0; n < ctx->n_cache; n++) | ||
av_freep(&ctx->cache[n].data); | ||
ctx->n_cache = 0; | ||
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return 0; | ||
} | ||
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static void vp9_superframe_close(AVBitStreamFilterContext *bsfc) | ||
{ | ||
VP9BSFContext *ctx = bsfc->priv_data; | ||
int n; | ||
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// free cached data | ||
for (n = 0; n < ctx->n_cache; n++) | ||
av_freep(&ctx->cache[n].data); | ||
} | ||
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AVBitStreamFilter ff_vp9_superframe_bsf = { | ||
.name = "vp9_superframe", | ||
.priv_data_size = sizeof(VP9BSFContext), | ||
.filter = vp9_superframe_filter, | ||
.close = vp9_superframe_close, | ||
}; |
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