ffmpeg: Use codec hardware config to configure hwaccels

Removes specific support for all hwaccels supported by the generic code
(DXVA2, D3D11VA, NVDEC, VAAPI and VDPAU).

fftools/ffmpeg.c

@@ -2792,45 +2792,77 @@ fail:
     av_freep(&avc);
 }
 
-static const HWAccel *get_hwaccel(enum AVPixelFormat pix_fmt, enum HWAccelID selected_hwaccel_id)
-{
-    int i;
-    for (i = 0; hwaccels[i].name; i++)
-        if (hwaccels[i].pix_fmt == pix_fmt &&
-            (!selected_hwaccel_id || selected_hwaccel_id == HWACCEL_AUTO || hwaccels[i].id == selected_hwaccel_id))
-            return &hwaccels[i];
-    return NULL;
-}
-
 static enum AVPixelFormat get_format(AVCodecContext *s, const enum AVPixelFormat *pix_fmts)
 {
     InputStream *ist = s->opaque;
     const enum AVPixelFormat *p;
     int ret;
 
-    for (p = pix_fmts; *p != -1; p++) {
+    for (p = pix_fmts; *p != AV_PIX_FMT_NONE; p++) {
         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(*p);
-        const HWAccel *hwaccel;
+        const AVCodecHWConfig  *config = NULL;
+        int i;
 
         if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
             break;
 
-        hwaccel = get_hwaccel(*p, ist->hwaccel_id);
-        if (!hwaccel ||
-            (ist->active_hwaccel_id && ist->active_hwaccel_id != hwaccel->id) ||
-            (ist->hwaccel_id != HWACCEL_AUTO && ist->hwaccel_id != hwaccel->id))
-            continue;
+        if (ist->hwaccel_id == HWACCEL_GENERIC ||
+            ist->hwaccel_id == HWACCEL_AUTO) {
+            for (i = 0;; i++) {
+                config = avcodec_get_hw_config(s->codec, i);
+                if (!config)
+                    break;
+                if (!(config->methods &
+                      AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX))
+                    continue;
+                if (config->pix_fmt == *p)
+                    break;
+            }
+        }
+        if (config) {
+            if (config->device_type != ist->hwaccel_device_type) {
+                // Different hwaccel offered, ignore.
+                continue;
+            }
 
-        ret = hwaccel->init(s);
-        if (ret < 0) {
-            if (ist->hwaccel_id == hwaccel->id) {
+            ret = hwaccel_decode_init(s);
+            if (ret < 0) {
+                if (ist->hwaccel_id == HWACCEL_GENERIC) {
+                    av_log(NULL, AV_LOG_FATAL,
+                           "%s hwaccel requested for input stream #%d:%d, "
+                           "but cannot be initialized.\n",
+                           av_hwdevice_get_type_name(config->device_type),
+                           ist->file_index, ist->st->index);
+                    return AV_PIX_FMT_NONE;
+                }
+                continue;
+            }
+        } else {
+            const HWAccel *hwaccel = NULL;
+            int i;
+            for (i = 0; hwaccels[i].name; i++) {
+                if (hwaccels[i].pix_fmt == *p) {
+                    hwaccel = &hwaccels[i];
+                    break;
+                }
+            }
+            if (!hwaccel) {
+                // No hwaccel supporting this pixfmt.
+                continue;
+            }
+            if (hwaccel->id != ist->hwaccel_id) {
+                // Does not match requested hwaccel.
+                continue;
+            }
+
+            ret = hwaccel->init(s);
+            if (ret < 0) {
                 av_log(NULL, AV_LOG_FATAL,
                        "%s hwaccel requested for input stream #%d:%d, "
                        "but cannot be initialized.\n", hwaccel->name,
                        ist->file_index, ist->st->index);
                 return AV_PIX_FMT_NONE;
             }
-            continue;
         }
 
         if (ist->hw_frames_ctx) {
@@ -2839,8 +2871,7 @@ static enum AVPixelFormat get_format(AVCodecContext *s, const enum AVPixelFormat
                 return AV_PIX_FMT_NONE;
         }
 
-        ist->active_hwaccel_id = hwaccel->id;
-        ist->hwaccel_pix_fmt   = *p;
+        ist->hwaccel_pix_fmt = *p;
         break;
     }
 

fftools/ffmpeg.h

@@ -61,14 +61,10 @@
 enum HWAccelID {
     HWACCEL_NONE = 0,
     HWACCEL_AUTO,
-    HWACCEL_VDPAU,
-    HWACCEL_DXVA2,
+    HWACCEL_GENERIC,
     HWACCEL_VIDEOTOOLBOX,
     HWACCEL_QSV,
-    HWACCEL_VAAPI,
     HWACCEL_CUVID,
-    HWACCEL_D3D11VA,
-    HWACCEL_NVDEC,
 };
 
 typedef struct HWAccel {
@@ -76,7 +72,6 @@ typedef struct HWAccel {
     int (*init)(AVCodecContext *s);
     enum HWAccelID id;
     enum AVPixelFormat pix_fmt;
-    enum AVHWDeviceType device_type;
 } HWAccel;
 
 typedef struct HWDevice {
@@ -370,11 +365,11 @@ typedef struct InputStream {
 
     /* hwaccel options */
     enum HWAccelID hwaccel_id;
+    enum AVHWDeviceType hwaccel_device_type;
     char  *hwaccel_device;
     enum AVPixelFormat hwaccel_output_format;
 
     /* hwaccel context */
-    enum HWAccelID active_hwaccel_id;
     void  *hwaccel_ctx;
     void (*hwaccel_uninit)(AVCodecContext *s);
     int  (*hwaccel_get_buffer)(AVCodecContext *s, AVFrame *frame, int flags);

fftools/ffmpeg_hw.c

@@ -64,6 +64,31 @@ static HWDevice *hw_device_add(void)
     return hw_devices[nb_hw_devices++];
 }
 
+static char *hw_device_default_name(enum AVHWDeviceType type)
+{
+    // Make an automatic name of the form "type%d".  We arbitrarily
+    // limit at 1000 anonymous devices of the same type - there is
+    // probably something else very wrong if you get to this limit.
+    const char *type_name = av_hwdevice_get_type_name(type);
+    char *name;
+    size_t index_pos;
+    int index, index_limit = 1000;
+    index_pos = strlen(type_name);
+    name = av_malloc(index_pos + 4);
+    if (!name)
+        return NULL;
+    for (index = 0; index < index_limit; index++) {
+        snprintf(name, index_pos + 4, "%s%d", type_name, index);
+        if (!hw_device_get_by_name(name))
+            break;
+    }
+    if (index >= index_limit) {
+        av_freep(&name);
+        return NULL;
+    }
+    return name;
+}
+
 int hw_device_init_from_string(const char *arg, HWDevice **dev_out)
 {
     // "type=name:device,key=value,key2=value2"
@@ -111,27 +136,11 @@ int hw_device_init_from_string(const char *arg, HWDevice **dev_out)
 
         p += 1 + k;
     } else {
-        // Give the device an automatic name of the form "type%d".
-        // We arbitrarily limit at 1000 anonymous devices of the same
-        // type - there is probably something else very wrong if you
-        // get to this limit.
-        size_t index_pos;
-        int index, index_limit = 1000;
-        index_pos = strlen(type_name);
-        name = av_malloc(index_pos + 4);
+        name = hw_device_default_name(type);
         if (!name) {
             err = AVERROR(ENOMEM);
             goto fail;
         }
-        for (index = 0; index < index_limit; index++) {
-            snprintf(name, index_pos + 4, "%s%d", type_name, index);
-            if (!hw_device_get_by_name(name))
-                break;
-        }
-        if (index >= index_limit) {
-            errmsg = "too many devices";
-            goto invalid;
-        }
     }
 
     if (!*p) {
@@ -214,6 +223,49 @@ fail:
     goto done;
 }
 
+static int hw_device_init_from_type(enum AVHWDeviceType type,
+                                    const char *device,
+                                    HWDevice **dev_out)
+{
+    AVBufferRef *device_ref = NULL;
+    HWDevice *dev;
+    char *name;
+    int err;
+
+    name = hw_device_default_name(type);
+    if (!name) {
+        err = AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    err = av_hwdevice_ctx_create(&device_ref, type, device, NULL, 0);
+    if (err < 0) {
+        av_log(NULL, AV_LOG_ERROR,
+               "Device creation failed: %d.\n", err);
+        goto fail;
+    }
+
+    dev = hw_device_add();
+    if (!dev) {
+        err = AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    dev->name = name;
+    dev->type = type;
+    dev->device_ref = device_ref;
+
+    if (dev_out)
+        *dev_out = dev;
+
+    return 0;
+
+fail:
+    av_freep(&name);
+    av_buffer_unref(&device_ref);
+    return err;
+}
+
 void hw_device_free_all(void)
 {
     int i;
@@ -226,80 +278,130 @@ void hw_device_free_all(void)
     nb_hw_devices = 0;
 }
 
-static enum AVHWDeviceType hw_device_match_type_by_hwaccel(enum HWAccelID hwaccel_id)
+static HWDevice *hw_device_match_by_codec(const AVCodec *codec)
 {
+    const AVCodecHWConfig *config;
+    HWDevice *dev;
     int i;
-    if (hwaccel_id == HWACCEL_NONE)
-        return AV_HWDEVICE_TYPE_NONE;
-    for (i = 0; hwaccels[i].name; i++) {
-        if (hwaccels[i].id == hwaccel_id)
-            return hwaccels[i].device_type;
+    for (i = 0;; i++) {
+        config = avcodec_get_hw_config(codec, i);
+        if (!config)
+            return NULL;
+        if (!(config->methods & AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX))
+            continue;
+        dev = hw_device_get_by_type(config->device_type);
+        if (dev)
+            return dev;
     }
-    return AV_HWDEVICE_TYPE_NONE;
-}
-
-static enum AVHWDeviceType hw_device_match_type_in_name(const char *codec_name)
-{
-    const char *type_name;
-    enum AVHWDeviceType type;
-    for (type = av_hwdevice_iterate_types(AV_HWDEVICE_TYPE_NONE);
-         type != AV_HWDEVICE_TYPE_NONE;
-         type = av_hwdevice_iterate_types(type)) {
-        type_name = av_hwdevice_get_type_name(type);
-        if (strstr(codec_name, type_name))
-            return type;
-    }
-    return AV_HWDEVICE_TYPE_NONE;
 }
 
 int hw_device_setup_for_decode(InputStream *ist)
 {
+    const AVCodecHWConfig *config;
     enum AVHWDeviceType type;
-    HWDevice *dev;
-    int err;
+    HWDevice *dev = NULL;
+    int err, auto_device = 0;
 
     if (ist->hwaccel_device) {
         dev = hw_device_get_by_name(ist->hwaccel_device);
         if (!dev) {
-            char *tmp;
-            type = hw_device_match_type_by_hwaccel(ist->hwaccel_id);
-            if (type == AV_HWDEVICE_TYPE_NONE) {
-                // No match - this isn't necessarily invalid, though,
-                // because an explicit device might not be needed or
-                // the hwaccel setup could be handled elsewhere.
+            if (ist->hwaccel_id == HWACCEL_AUTO) {
+                auto_device = 1;
+            } else if (ist->hwaccel_id == HWACCEL_GENERIC) {
+                type = ist->hwaccel_device_type;
+                err = hw_device_init_from_type(type, ist->hwaccel_device,
+                                               &dev);
+            } else {
+                // This will be dealt with by API-specific initialisation
+                // (using hwaccel_device), so nothing further needed here.
                 return 0;
             }
-            tmp = av_asprintf("%s:%s", av_hwdevice_get_type_name(type),
-                              ist->hwaccel_device);
-            if (!tmp)
-                return AVERROR(ENOMEM);
-            err = hw_device_init_from_string(tmp, &dev);
-            av_free(tmp);
-            if (err < 0)
-                return err;
+        } else {
+            if (ist->hwaccel_id == HWACCEL_AUTO) {
+                ist->hwaccel_device_type = dev->type;
+            } else if (ist->hwaccel_device_type != dev->type) {
+                av_log(ist->dec_ctx, AV_LOG_ERROR, "Invalid hwaccel device "
+                       "specified for decoder: device %s of type %s is not "
+                       "usable with hwaccel %s.\n", dev->name,
+                       av_hwdevice_get_type_name(dev->type),
+                       av_hwdevice_get_type_name(ist->hwaccel_device_type));
+                return AVERROR(EINVAL);
+            }
         }
     } else {
-        if (ist->hwaccel_id != HWACCEL_NONE)
-            type = hw_device_match_type_by_hwaccel(ist->hwaccel_id);
-        else
-            type = hw_device_match_type_in_name(ist->dec->name);
-        if (type != AV_HWDEVICE_TYPE_NONE) {
+        if (ist->hwaccel_id == HWACCEL_AUTO) {
+            auto_device = 1;
+        } else if (ist->hwaccel_id == HWACCEL_GENERIC) {
+            type = ist->hwaccel_device_type;
             dev = hw_device_get_by_type(type);
+            if (!dev)
+                err = hw_device_init_from_type(type, NULL, &dev);
+        } else {
+            dev = hw_device_match_by_codec(ist->dec);
             if (!dev) {
-                hw_device_init_from_string(av_hwdevice_get_type_name(type),
+                // No device for this codec, but not using generic hwaccel
+                // and therefore may well not need one - ignore.
+                return 0;
+            }
+        }
+    }
+
+    if (auto_device) {
+        int i;
+        if (!avcodec_get_hw_config(ist->dec, 0)) {
+            // Decoder does not support any hardware devices.
+            return 0;
+        }
+        for (i = 0; !dev; i++) {
+            config = avcodec_get_hw_config(ist->dec, i);
+            if (!config)
+                break;
+            type = config->device_type;
+            dev = hw_device_get_by_type(type);
+            if (dev) {
+                av_log(ist->dec_ctx, AV_LOG_INFO, "Using auto "
+                       "hwaccel type %s with existing device %s.\n",
+                       av_hwdevice_get_type_name(type), dev->name);
+            }
+        }
+        for (i = 0; !dev; i++) {
+            config = avcodec_get_hw_config(ist->dec, i);
+            if (!config)
+                break;
+            type = config->device_type;
+            // Try to make a new device of this type.
+            err = hw_device_init_from_type(type, ist->hwaccel_device,
                                            &dev);
+            if (err < 0) {
+                // Can't make a device of this type.
+                continue;
+            }
+            if (ist->hwaccel_device) {
+                av_log(ist->dec_ctx, AV_LOG_INFO, "Using auto "
+                       "hwaccel type %s with new device created "
+                       "from %s.\n", av_hwdevice_get_type_name(type),
+                       ist->hwaccel_device);
+            } else {
+                av_log(ist->dec_ctx, AV_LOG_INFO, "Using auto "
+                       "hwaccel type %s with new default device.\n",
+                       av_hwdevice_get_type_name(type));
             }
+        }
+        if (dev) {
+            ist->hwaccel_device_type = type;
         } else {
-            // No device required.
+            av_log(ist->dec_ctx, AV_LOG_INFO, "Auto hwaccel "
+                   "disabled: no device found.\n");
+            ist->hwaccel_id = HWACCEL_NONE;
             return 0;
         }
     }
 
     if (!dev) {
-        av_log(ist->dec_ctx, AV_LOG_WARNING, "No device available "
-               "for decoder (device type %s for codec %s).\n",
+        av_log(ist->dec_ctx, AV_LOG_ERROR, "No device available "
+               "for decoder: device type %s needed for codec %s.\n",
                av_hwdevice_get_type_name(type), ist->dec->name);
-        return 0;
+        return err;
     }
 
     ist->dec_ctx->hw_device_ctx = av_buffer_ref(dev->device_ref);
@@ -311,24 +413,16 @@ int hw_device_setup_for_decode(InputStream *ist)
 
 int hw_device_setup_for_encode(OutputStream *ost)
 {
-    enum AVHWDeviceType type;
     HWDevice *dev;
 
-    type = hw_device_match_type_in_name(ost->enc->name);
-    if (type != AV_HWDEVICE_TYPE_NONE) {
-        dev = hw_device_get_by_type(type);
-        if (!dev) {
-            av_log(ost->enc_ctx, AV_LOG_WARNING, "No device available "
-                   "for encoder (device type %s for codec %s).\n",
-                   av_hwdevice_get_type_name(type), ost->enc->name);
-            return 0;
-        }
+    dev = hw_device_match_by_codec(ost->enc);
+    if (dev) {
         ost->enc_ctx->hw_device_ctx = av_buffer_ref(dev->device_ref);
         if (!ost->enc_ctx->hw_device_ctx)
             return AVERROR(ENOMEM);
         return 0;
     } else {
-        // No device required.
+        // No device required, or no device available.
         return 0;
     }
 }

fftools/ffmpeg_opt.c

@@ -66,37 +66,14 @@
 }
 
 const HWAccel hwaccels[] = {
-#if HAVE_VDPAU_X11
-    { "vdpau", hwaccel_decode_init, HWACCEL_VDPAU, AV_PIX_FMT_VDPAU,
-      AV_HWDEVICE_TYPE_VDPAU },
-#endif
-#if CONFIG_D3D11VA
-    { "d3d11va", hwaccel_decode_init, HWACCEL_D3D11VA, AV_PIX_FMT_D3D11,
-      AV_HWDEVICE_TYPE_D3D11VA },
-#endif
-#if CONFIG_DXVA2
-    { "dxva2", hwaccel_decode_init, HWACCEL_DXVA2, AV_PIX_FMT_DXVA2_VLD,
-      AV_HWDEVICE_TYPE_DXVA2 },
-#endif
 #if CONFIG_VIDEOTOOLBOX
-    { "videotoolbox",   videotoolbox_init,   HWACCEL_VIDEOTOOLBOX,   AV_PIX_FMT_VIDEOTOOLBOX,
-      AV_HWDEVICE_TYPE_NONE },
+    { "videotoolbox", videotoolbox_init, HWACCEL_VIDEOTOOLBOX, AV_PIX_FMT_VIDEOTOOLBOX },
 #endif
 #if CONFIG_LIBMFX
-    { "qsv",   qsv_init,   HWACCEL_QSV,   AV_PIX_FMT_QSV,
-      AV_HWDEVICE_TYPE_NONE },
-#endif
-#if CONFIG_VAAPI
-    { "vaapi", hwaccel_decode_init, HWACCEL_VAAPI, AV_PIX_FMT_VAAPI,
-      AV_HWDEVICE_TYPE_VAAPI },
-#endif
-#if CONFIG_NVDEC
-    { "nvdec", hwaccel_decode_init, HWACCEL_NVDEC, AV_PIX_FMT_CUDA,
-       AV_HWDEVICE_TYPE_CUDA },
+    { "qsv",   qsv_init,   HWACCEL_QSV,   AV_PIX_FMT_QSV },
 #endif
 #if CONFIG_CUVID
-    { "cuvid", cuvid_init, HWACCEL_CUVID, AV_PIX_FMT_CUDA,
-      AV_HWDEVICE_TYPE_NONE },
+    { "cuvid", cuvid_init, HWACCEL_CUVID, AV_PIX_FMT_CUDA },
 #endif
     { 0 },
 };
@@ -194,12 +171,15 @@ static void init_options(OptionsContext *o)
 
 static int show_hwaccels(void *optctx, const char *opt, const char *arg)
 {
+    enum AVHWDeviceType type = AV_HWDEVICE_TYPE_NONE;
     int i;
 
     printf("Hardware acceleration methods:\n");
-    for (i = 0; hwaccels[i].name; i++) {
+    while ((type = av_hwdevice_iterate_types(type)) !=
+           AV_HWDEVICE_TYPE_NONE)
+        printf("%s\n", av_hwdevice_get_type_name(type));
+    for (i = 0; hwaccels[i].name; i++)
         printf("%s\n", hwaccels[i].name);
-    }
     printf("\n");
     return 0;
 }
@@ -819,11 +799,16 @@ static void add_input_streams(OptionsContext *o, AVFormatContext *ic)
 
             MATCH_PER_STREAM_OPT(hwaccels, str, hwaccel, ic, st);
             if (hwaccel) {
+                // The NVDEC hwaccels use a CUDA device, so remap the name here.
+                if (!strcmp(hwaccel, "nvdec"))
+                    hwaccel = "cuda";
+
                 if (!strcmp(hwaccel, "none"))
                     ist->hwaccel_id = HWACCEL_NONE;
                 else if (!strcmp(hwaccel, "auto"))
                     ist->hwaccel_id = HWACCEL_AUTO;
                 else {
+                    enum AVHWDeviceType type;
                     int i;
                     for (i = 0; hwaccels[i].name; i++) {
                         if (!strcmp(hwaccels[i].name, hwaccel)) {
@@ -832,10 +817,23 @@ static void add_input_streams(OptionsContext *o, AVFormatContext *ic)
                         }
                     }
 
+                    if (!ist->hwaccel_id) {
+                        type = av_hwdevice_find_type_by_name(hwaccel);
+                        if (type != AV_HWDEVICE_TYPE_NONE) {
+                            ist->hwaccel_id = HWACCEL_GENERIC;
+                            ist->hwaccel_device_type = type;
+                        }
+                    }
+
                     if (!ist->hwaccel_id) {
                         av_log(NULL, AV_LOG_FATAL, "Unrecognized hwaccel: %s.\n",
                                hwaccel);
                         av_log(NULL, AV_LOG_FATAL, "Supported hwaccels: ");
+                        type = AV_HWDEVICE_TYPE_NONE;
+                        while ((type = av_hwdevice_iterate_types(type)) !=
+                               AV_HWDEVICE_TYPE_NONE)
+                            av_log(NULL, AV_LOG_FATAL, "%s ",
+                                   av_hwdevice_get_type_name(type));
                         for (i = 0; hwaccels[i].name; i++)
                             av_log(NULL, AV_LOG_FATAL, "%s ", hwaccels[i].name);
                         av_log(NULL, AV_LOG_FATAL, "\n");