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lavc/hevcdec: unbreak WPP/progress2 code

The "progress2" API in pthread_slice.c currently associates a progress value with a thread rather than a job, relying on the broken assumption that a job's thread number is equal to its job number modulo thread count. This removes this API entirely, and changes hevcdec to use a ThreadProgress-based implementation that associates a mutex/cond/progress value with every job. Fixes races and deadlocks in hevdec with slice threading, e.g. some of those mentioned in #11221.

Anton Khirnov committed 2 years ago

Commit 79c47df1 parent c50f79a5 files · +46 −139Browse files

Showing the changes to libavcodec (5 of 5 files). Show all

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5 files
  1. libavcodec/hevc/hevcdec.c +43 −14
  2. libavcodec/hevc/hevcdec.h +3 −0
  3. libavcodec/pthread_slice.c +0 −102
  4. libavcodec/thread.h +0 −4
  5. libavcodec/utils.c +0 −19
libavcodec/hevc/hevcdec.c+43−14
@@ -54,6 +54,7 @@ · 53 unmodified lines
54#include "progressframe.h"54#include "progressframe.h"
55#include "refstruct.h"55#include "refstruct.h"
56#include "thread.h"56#include "thread.h"
57#include "threadprogress.h"
57 58
58static const uint8_t hevc_pel_weight[65] = { [2] = 0, [4] = 1, [6] = 2, [8] = 3, [12] = 4, [16] = 5, [24] = 6, [32] = 7, [48] = 8, [64] = 9 };59static const uint8_t hevc_pel_weight[65] = { [2] = 0, [4] = 1, [6] = 2, [8] = 3, [12] = 4, [16] = 5, [24] = 6, [32] = 7, [48] = 8, [64] = 9 };
59 60
@@ -2751,6 +2752,8 @@ static int hls_decode_entry_wpp(AVCodecContext *avctx, void *hevc_lclist, · 2691 unmodified lines
2751 const uint8_t *data = s->data + s->sh.offset[ctb_row];2752 const uint8_t *data = s->data + s->sh.offset[ctb_row];
2752 const size_t data_size = s->sh.size[ctb_row];2753 const size_t data_size = s->sh.size[ctb_row];
2753 2754
2755 int progress = 0;
2756
2754 int ret;2757 int ret;
2755 2758
2756 if (ctb_row)2759 if (ctb_row)
@@ -2762,13 +2765,15 @@ static int hls_decode_entry_wpp(AVCodecContext *avctx, void *hevc_lclist, · 5 unmodified lines
2762 2765
2763 hls_decode_neighbour(lc, l, pps, sps, x_ctb, y_ctb, ctb_addr_ts);2766 hls_decode_neighbour(lc, l, pps, sps, x_ctb, y_ctb, ctb_addr_ts);
2764 2767
2765 ff_thread_await_progress2(s->avctx, ctb_row, thread, SHIFT_CTB_WPP);2768 if (ctb_row)
2769 ff_thread_progress_await(&s->wpp_progress[ctb_row - 1],
2770 progress + SHIFT_CTB_WPP + 1);
2766 2771
2767 /* atomic_load's prototype requires a pointer to non-const atomic variable2772 /* atomic_load's prototype requires a pointer to non-const atomic variable
2768 * (due to implementations via mutexes, where reads involve writes).2773 * (due to implementations via mutexes, where reads involve writes).
2769 * Of course, casting const away here is nevertheless safe. */2774 * Of course, casting const away here is nevertheless safe. */
2770 if (atomic_load((atomic_int*)&s->wpp_err)) {2775 if (atomic_load((atomic_int*)&s->wpp_err)) {
2771 ff_thread_report_progress2(s->avctx, ctb_row , thread, SHIFT_CTB_WPP);2776 ff_thread_progress_report(&s->wpp_progress[ctb_row], INT_MAX);
2772 return 0;2777 return 0;
2773 }2778 }
2774 2779
@@ -2792,19 +2797,19 @@ static int hls_decode_entry_wpp(AVCodecContext *avctx, void *hevc_lclist, · 17 unmodified lines
2792 ctb_addr_ts++;2797 ctb_addr_ts++;
2793 2798
2794 ff_hevc_save_states(lc, pps, ctb_addr_ts);2799 ff_hevc_save_states(lc, pps, ctb_addr_ts);
2795 ff_thread_report_progress2(s->avctx, ctb_row, thread, 1);2800 ff_thread_progress_report(&s->wpp_progress[ctb_row], ++progress);
2796 ff_hevc_hls_filters(lc, l, pps, x_ctb, y_ctb, ctb_size);2801 ff_hevc_hls_filters(lc, l, pps, x_ctb, y_ctb, ctb_size);
2797 2802
2798 if (!more_data && (x_ctb+ctb_size) < sps->width && ctb_row != s->sh.num_entry_point_offsets) {2803 if (!more_data && (x_ctb+ctb_size) < sps->width && ctb_row != s->sh.num_entry_point_offsets) {
2799 /* Casting const away here is safe, because it is an atomic operation. */2804 /* Casting const away here is safe, because it is an atomic operation. */
2800 atomic_store((atomic_int*)&s->wpp_err, 1);2805 atomic_store((atomic_int*)&s->wpp_err, 1);
2801 ff_thread_report_progress2(s->avctx, ctb_row ,thread, SHIFT_CTB_WPP);2806 ff_thread_progress_report(&s->wpp_progress[ctb_row], INT_MAX);
2802 return 0;2807 return 0;
2803 }2808 }
2804 2809
2805 if ((x_ctb+ctb_size) >= sps->width && (y_ctb+ctb_size) >= sps->height ) {2810 if ((x_ctb+ctb_size) >= sps->width && (y_ctb+ctb_size) >= sps->height ) {
2806 ff_hevc_hls_filter(lc, l, pps, x_ctb, y_ctb, ctb_size);2811 ff_hevc_hls_filter(lc, l, pps, x_ctb, y_ctb, ctb_size);
2807 ff_thread_report_progress2(s->avctx, ctb_row , thread, SHIFT_CTB_WPP);2812 ff_thread_progress_report(&s->wpp_progress[ctb_row], INT_MAX);
2808 return ctb_addr_ts;2813 return ctb_addr_ts;
2809 }2814 }
2810 ctb_addr_rs = pps->ctb_addr_ts_to_rs[ctb_addr_ts];2815 ctb_addr_rs = pps->ctb_addr_ts_to_rs[ctb_addr_ts];
@@ -2814,17 +2819,43 @@ static int hls_decode_entry_wpp(AVCodecContext *avctx, void *hevc_lclist, · 3 unmodified lines
2814 break;2819 break;
2815 }2820 }
2816 }2821 }
2817 ff_thread_report_progress2(s->avctx, ctb_row ,thread, SHIFT_CTB_WPP);2822 ff_thread_progress_report(&s->wpp_progress[ctb_row], INT_MAX);
2818 2823
2819 return 0;2824 return 0;
2820error:2825error:
2821 l->tab_slice_address[ctb_addr_rs] = -1;2826 l->tab_slice_address[ctb_addr_rs] = -1;
2822 /* Casting const away here is safe, because it is an atomic operation. */2827 /* Casting const away here is safe, because it is an atomic operation. */
2823 atomic_store((atomic_int*)&s->wpp_err, 1);2828 atomic_store((atomic_int*)&s->wpp_err, 1);
2824 ff_thread_report_progress2(s->avctx, ctb_row ,thread, SHIFT_CTB_WPP);2829 ff_thread_progress_report(&s->wpp_progress[ctb_row], INT_MAX);
2825 return ret;2830 return ret;
2826}2831}
2827 2832
2833static int wpp_progress_init(HEVCContext *s, unsigned count)
2834{
2835 if (s->nb_wpp_progress < count) {
2836 void *tmp = av_realloc_array(s->wpp_progress, count,
2837 sizeof(*s->wpp_progress));
2838 if (!tmp)
2839 return AVERROR(ENOMEM);
2840
2841 s->wpp_progress = tmp;
2842 memset(s->wpp_progress + s->nb_wpp_progress, 0,
2843 (count - s->nb_wpp_progress) * sizeof(*s->wpp_progress));
2844
2845 for (int i = s->nb_wpp_progress; i < count; i++) {
2846 int ret = ff_thread_progress_init(&s->wpp_progress[i], 1);
2847 if (ret < 0)
2848 return ret;
2849 s->nb_wpp_progress = i + 1;
2850 }
2851 }
2852
2853 for (int i = 0; i < count; i++)
2854 ff_thread_progress_reset(&s->wpp_progress[i]);
2855
2856 return 0;
2857}
2858
2828static int hls_slice_data_wpp(HEVCContext *s, const H2645NAL *nal)2859static int hls_slice_data_wpp(HEVCContext *s, const H2645NAL *nal)
2829{2860{
2830 const HEVCPPS *const pps = s->pps;2861 const HEVCPPS *const pps = s->pps;
@@ -2909,7 +2940,7 @@ static int hls_slice_data_wpp(HEVCContext *s, const H2645NAL *nal) · 78 unmodified lines
2909 }2940 }
2910 2941
2911 atomic_store(&s->wpp_err, 0);2942 atomic_store(&s->wpp_err, 0);
2912 res = ff_slice_thread_allocz_entries(s->avctx, s->sh.num_entry_point_offsets + 1);2943 res = wpp_progress_init(s, s->sh.num_entry_point_offsets + 1);
2913 if (res < 0)2944 if (res < 0)
2914 return res;2945 return res;
2915 2946
@@ -3826,6 +3857,10 @@ static av_cold int hevc_decode_free(AVCodecContext *avctx) · 910 unmodified lines
3826 3857
3827 ff_hevc_ps_uninit(&s->ps);3858 ff_hevc_ps_uninit(&s->ps);
3828 3859
3860 for (int i = 0; i < s->nb_wpp_progress; i++)
3861 ff_thread_progress_destroy(&s->wpp_progress[i]);
3862 av_freep(&s->wpp_progress);
3863
3829 av_freep(&s->sh.entry_point_offset);3864 av_freep(&s->sh.entry_point_offset);
3830 av_freep(&s->sh.offset);3865 av_freep(&s->sh.offset);
3831 av_freep(&s->sh.size);3866 av_freep(&s->sh.size);
@@ -3981,12 +4016,6 @@ static av_cold int hevc_decode_init(AVCodecContext *avctx) · 149 unmodified lines
3981 HEVCContext *s = avctx->priv_data;4016 HEVCContext *s = avctx->priv_data;
3982 int ret;4017 int ret;
3983 4018
3984 if (avctx->active_thread_type & FF_THREAD_SLICE) {
3985 ret = ff_slice_thread_init_progress(avctx);
3986 if (ret < 0)
3987 return ret;
3988 }
3989
3990 ret = hevc_init_context(avctx);4019 ret = hevc_init_context(avctx);
3991 if (ret < 0)4020 if (ret < 0)
3992 return ret;4021 return ret;
libavcodec/hevc/hevcdec.h+3−0
@@ -540,6 +540,9 @@ typedef struct HEVCContext { · 539 unmodified lines
540 /** The target for the common_cabac_state of the local contexts. */540 /** The target for the common_cabac_state of the local contexts. */
541 HEVCCABACState cabac;541 HEVCCABACState cabac;
542 542
543 struct ThreadProgress *wpp_progress;
544 unsigned nb_wpp_progress;
545
543 atomic_int wpp_err;546 atomic_int wpp_err;
544 547
545 const uint8_t *data;548 const uint8_t *data;
libavcodec/pthread_slice.c+0−102
@@ -41,11 +41,6 @@ typedef int (action_func)(AVCodecContext *c, void *arg); · 40 unmodified lines
41typedef int (action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr);41typedef int (action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr);
42typedef int (main_func)(AVCodecContext *c);42typedef int (main_func)(AVCodecContext *c);
43 43
44typedef struct Progress {
45 pthread_cond_t cond;
46 pthread_mutex_t mutex;
47} Progress;
48
49typedef struct SliceThreadContext {44typedef struct SliceThreadContext {
50 AVSliceThread *thread;45 AVSliceThread *thread;
51 action_func *func;46 action_func *func;
@@ -54,11 +49,6 @@ typedef struct SliceThreadContext { · 2 unmodified lines
54 void *args;49 void *args;
55 int *rets;50 int *rets;
56 int job_size;51 int job_size;
57
58 int *entries;
59 int entries_count;
60 int thread_count;
61 Progress *progress;
62} SliceThreadContext;52} SliceThreadContext;
63 53
64static void main_function(void *priv) {54static void main_function(void *priv) {
@@ -82,18 +72,9 @@ static void worker_func(void *priv, int jobnr, int threadnr, int nb_jobs, int nb · 17 unmodified lines
82void ff_slice_thread_free(AVCodecContext *avctx)72void ff_slice_thread_free(AVCodecContext *avctx)
83{73{
84 SliceThreadContext *c = avctx->internal->thread_ctx;74 SliceThreadContext *c = avctx->internal->thread_ctx;
85 int i;
86 75
87 avpriv_slicethread_free(&c->thread);76 avpriv_slicethread_free(&c->thread);
88 77
89 for (i = 0; i < c->thread_count; i++) {
90 Progress *const progress = &c->progress[i];
91 pthread_mutex_destroy(&progress->mutex);
92 pthread_cond_destroy(&progress->cond);
93 }
94
95 av_freep(&c->entries);
96 av_freep(&c->progress);
97 av_freep(&avctx->internal->thread_ctx);78 av_freep(&avctx->internal->thread_ctx);
98}79}
99 80
@@ -175,86 +156,3 @@ int ff_slice_thread_init(AVCodecContext *avctx) · 75 unmodified lines
175 avctx->execute2 = thread_execute2;156 avctx->execute2 = thread_execute2;
176 return 0;157 return 0;
177}158}
178
179int av_cold ff_slice_thread_init_progress(AVCodecContext *avctx)
180{
181 SliceThreadContext *const p = avctx->internal->thread_ctx;
182 int err, i = 0, thread_count = avctx->thread_count;
183
184 p->progress = av_calloc(thread_count, sizeof(*p->progress));
185 if (!p->progress) {
186 err = AVERROR(ENOMEM);
187 goto fail;
188 }
189
190 for (; i < thread_count; i++) {
191 Progress *const progress = &p->progress[i];
192 err = pthread_mutex_init(&progress->mutex, NULL);
193 if (err) {
194 err = AVERROR(err);
195 goto fail;
196 }
197 err = pthread_cond_init (&progress->cond, NULL);
198 if (err) {
199 err = AVERROR(err);
200 pthread_mutex_destroy(&progress->mutex);
201 goto fail;
202 }
203 }
204 err = 0;
205fail:
206 p->thread_count = i;
207 return err;
208}
209
210void ff_thread_report_progress2(AVCodecContext *avctx, int field, int thread, int n)
211{
212 SliceThreadContext *p = avctx->internal->thread_ctx;
213 Progress *const progress = &p->progress[thread];
214 int *entries = p->entries;
215
216 pthread_mutex_lock(&progress->mutex);
217 entries[field] +=n;
218 pthread_cond_signal(&progress->cond);
219 pthread_mutex_unlock(&progress->mutex);
220}
221
222void ff_thread_await_progress2(AVCodecContext *avctx, int field, int thread, int shift)
223{
224 SliceThreadContext *p = avctx->internal->thread_ctx;
225 Progress *progress;
226 int *entries = p->entries;
227
228 if (!entries || !field) return;
229
230 thread = thread ? thread - 1 : p->thread_count - 1;
231 progress = &p->progress[thread];
232
233 pthread_mutex_lock(&progress->mutex);
234 while ((entries[field - 1] - entries[field]) < shift){
235 pthread_cond_wait(&progress->cond, &progress->mutex);
236 }
237 pthread_mutex_unlock(&progress->mutex);
238}
239
240int ff_slice_thread_allocz_entries(AVCodecContext *avctx, int count)
241{
242 if (avctx->active_thread_type & FF_THREAD_SLICE) {
243 SliceThreadContext *p = avctx->internal->thread_ctx;
244
245 if (p->entries_count == count) {
246 memset(p->entries, 0, p->entries_count * sizeof(*p->entries));
247 return 0;
248 }
249 av_freep(&p->entries);
250
251 p->entries = av_calloc(count, sizeof(*p->entries));
252 if (!p->entries) {
253 p->entries_count = 0;
254 return AVERROR(ENOMEM);
255 }
256 p->entries_count = count;
257 }
258
259 return 0;
260}
libavcodec/thread.h+0−4
@@ -56,10 +56,6 @@ int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *f, int flags); · 55 unmodified lines
56int ff_slice_thread_execute_with_mainfunc(AVCodecContext *avctx,56int ff_slice_thread_execute_with_mainfunc(AVCodecContext *avctx,
57 int (*action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr),57 int (*action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr),
58 int (*main_func)(AVCodecContext *c), void *arg, int *ret, int job_count);58 int (*main_func)(AVCodecContext *c), void *arg, int *ret, int job_count);
59int ff_slice_thread_allocz_entries(AVCodecContext *avctx, int count);
60int ff_slice_thread_init_progress(AVCodecContext *avctx);
61void ff_thread_report_progress2(AVCodecContext *avctx, int field, int thread, int n);
62void ff_thread_await_progress2(AVCodecContext *avctx, int field, int thread, int shift);
63 59
64enum ThreadingStatus {60enum ThreadingStatus {
65 FF_THREAD_IS_COPY,61 FF_THREAD_IS_COPY,
libavcodec/utils.c+0−19
@@ -913,25 +913,6 @@ int ff_thread_can_start_frame(AVCodecContext *avctx) · 912 unmodified lines
913{913{
914 return 1;914 return 1;
915}915}
916
917int ff_slice_thread_init_progress(AVCodecContext *avctx)
918{
919 return 0;
920}
921
922int ff_slice_thread_allocz_entries(AVCodecContext *avctx, int count)
923{
924 return 0;
925}
926
927void ff_thread_await_progress2(AVCodecContext *avctx, int field, int thread, int shift)
928{
929}
930
931void ff_thread_report_progress2(AVCodecContext *avctx, int field, int thread, int n)
932{
933}
934
935#endif916#endif
936 917
937const uint8_t *avpriv_find_start_code(const uint8_t *restrict p,918const uint8_t *avpriv_find_start_code(const uint8_t *restrict p,

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