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/* |
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* Vp9 invisible (alt-ref) frame to superframe merge bitstream filter |
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* Copyright (c) 2016 Ronald S. Bultje <rsbultje@gmail.com> |
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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/avassert.h" |
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#include "bsf.h" |
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#include "bsf_internal.h" |
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#include "get_bits.h" |
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#define MAX_CACHE 8 |
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typedef struct VP9BSFContext { |
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int n_cache; |
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AVPacket *cache[MAX_CACHE]; |
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} VP9BSFContext; |
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static void stats(AVPacket * const *in, int n_in, |
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unsigned *_max, unsigned *_sum) |
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{ |
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int n; |
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unsigned max = 0, sum = 0; |
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for (n = 0; n < n_in; n++) { |
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unsigned sz = in[n]->size; |
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if (sz > max) |
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max = sz; |
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sum += sz; |
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} |
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*_max = max; |
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*_sum = sum; |
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} |
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static int merge_superframe(AVPacket * const *in, int n_in, AVPacket *out) |
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{ |
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unsigned max, sum, mag, marker, n, sz; |
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uint8_t *ptr; |
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int res; |
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stats(in, n_in, &max, &sum); |
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mag = av_log2(max) >> 3; |
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marker = 0xC0 + (mag << 3) + (n_in - 1); |
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sz = sum + 2 + (mag + 1) * n_in; |
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res = av_new_packet(out, sz); |
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if (res < 0) |
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return res; |
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ptr = out->data; |
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for (n = 0; n < n_in; n++) { |
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memcpy(ptr, in[n]->data, in[n]->size); |
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ptr += in[n]->size; |
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} |
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#define wloop(mag, wr) \ |
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do { \ |
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for (n = 0; n < n_in; n++) { \ |
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wr; \ |
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ptr += mag + 1; \ |
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} \ |
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} while (0) |
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// write superframe with marker 110[mag:2][nframes:3] |
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*ptr++ = marker; |
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switch (mag) { |
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case 0: |
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wloop(mag, *ptr = in[n]->size); |
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break; |
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case 1: |
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wloop(mag, AV_WL16(ptr, in[n]->size)); |
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break; |
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case 2: |
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wloop(mag, AV_WL24(ptr, in[n]->size)); |
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break; |
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case 3: |
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wloop(mag, AV_WL32(ptr, in[n]->size)); |
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break; |
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} |
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*ptr++ = marker; |
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av_assert0(ptr == &out->data[out->size]); |
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return 0; |
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} |
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static int vp9_superframe_filter(AVBSFContext *ctx, AVPacket *pkt) |
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{ |
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GetBitContext gb; |
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VP9BSFContext *s = ctx->priv_data; |
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int res, invisible, profile, marker, uses_superframe_syntax = 0, n; |
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res = ff_bsf_get_packet_ref(ctx, pkt); |
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✓✓ |
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if (res < 0) |
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return res; |
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marker = pkt->data[pkt->size - 1]; |
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✓✓ |
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if ((marker & 0xe0) == 0xc0) { |
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int nbytes = 1 + ((marker >> 3) & 0x3); |
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int n_frames = 1 + (marker & 0x7), idx_sz = 2 + n_frames * nbytes; |
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✓✗✓✗
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uses_superframe_syntax = pkt->size >= idx_sz && pkt->data[pkt->size - idx_sz] == marker; |
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} |
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✗✓ |
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if ((res = init_get_bits8(&gb, pkt->data, pkt->size)) < 0) |
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goto done; |
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get_bits(&gb, 2); // frame marker |
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profile = get_bits1(&gb); |
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profile |= get_bits1(&gb) << 1; |
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✓✓ |
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if (profile == 3) profile += get_bits1(&gb); |
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✓✓ |
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if (get_bits1(&gb)) { |
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invisible = 0; |
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} else { |
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get_bits1(&gb); // keyframe |
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invisible = !get_bits1(&gb); |
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} |
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✓✓✗✓
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if (uses_superframe_syntax && s->n_cache > 0) { |
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av_log(ctx, AV_LOG_ERROR, |
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"Mixing of superframe syntax and naked VP9 frames not supported\n"); |
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res = AVERROR(ENOSYS); |
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goto done; |
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✓✓✓✗ ✓✗ |
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} else if ((!invisible || uses_superframe_syntax) && !s->n_cache) { |
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// passthrough |
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return 0; |
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} else if (s->n_cache + 1 >= MAX_CACHE) { |
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av_log(ctx, AV_LOG_ERROR, |
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"Too many invisible frames\n"); |
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res = AVERROR_INVALIDDATA; |
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goto done; |
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} |
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av_packet_move_ref(s->cache[s->n_cache++], pkt); |
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if (invisible) { |
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return AVERROR(EAGAIN); |
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} |
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av_assert0(s->n_cache > 0); |
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// build superframe |
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if ((res = merge_superframe(s->cache, s->n_cache, pkt)) < 0) |
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goto done; |
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res = av_packet_copy_props(pkt, s->cache[s->n_cache - 1]); |
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if (res < 0) |
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goto done; |
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for (n = 0; n < s->n_cache; n++) |
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av_packet_unref(s->cache[n]); |
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s->n_cache = 0; |
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done: |
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if (res < 0) |
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av_packet_unref(pkt); |
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return res; |
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} |
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static int vp9_superframe_init(AVBSFContext *ctx) |
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{ |
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VP9BSFContext *s = ctx->priv_data; |
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int n; |
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// alloc cache packets |
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✓✓ |
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for (n = 0; n < MAX_CACHE; n++) { |
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s->cache[n] = av_packet_alloc(); |
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✗✓ |
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if (!s->cache[n]) |
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return AVERROR(ENOMEM); |
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} |
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return 0; |
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} |
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static void vp9_superframe_flush(AVBSFContext *ctx) |
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{ |
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VP9BSFContext *s = ctx->priv_data; |
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int n; |
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// unref cached data |
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for (n = 0; n < s->n_cache; n++) |
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av_packet_unref(s->cache[n]); |
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s->n_cache = 0; |
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} |
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static void vp9_superframe_close(AVBSFContext *ctx) |
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{ |
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VP9BSFContext *s = ctx->priv_data; |
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int n; |
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// free cached data |
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✓✓ |
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for (n = 0; n < MAX_CACHE; n++) |
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av_packet_free(&s->cache[n]); |
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} |
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static const enum AVCodecID codec_ids[] = { |
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AV_CODEC_ID_VP9, AV_CODEC_ID_NONE, |
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}; |
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const AVBitStreamFilter ff_vp9_superframe_bsf = { |
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.name = "vp9_superframe", |
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.priv_data_size = sizeof(VP9BSFContext), |
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.filter = vp9_superframe_filter, |
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.init = vp9_superframe_init, |
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.flush = vp9_superframe_flush, |
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.close = vp9_superframe_close, |
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.codec_ids = codec_ids, |
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}; |