eac3enc: support writing of basic mixing and info metadata

libavcodec/ac3enc.c

@@ -759,6 +759,30 @@ static void count_frame_bits(AC3EncodeContext *s)
 
     /* header */
     if (s->eac3) {
+        if (opt->eac3_mixing_metadata) {
+            if (s->channel_mode > AC3_CHMODE_STEREO)
+                frame_bits += 2;
+            if (s->has_center)
+                frame_bits += 6;
+            if (s->has_surround)
+                frame_bits += 6;
+            frame_bits += s->lfe_on;
+            frame_bits += 1 + 1 + 2;
+            if (s->channel_mode < AC3_CHMODE_STEREO)
+                frame_bits++;
+            frame_bits++;
+        }
+        if (opt->eac3_info_metadata) {
+            frame_bits += 3 + 1 + 1;
+            if (s->channel_mode == AC3_CHMODE_STEREO)
+                frame_bits += 2 + 2;
+            if (s->channel_mode >= AC3_CHMODE_2F2R)
+                frame_bits += 2;
+            frame_bits++;
+            if (opt->audio_production_info)
+                frame_bits += 5 + 2 + 1;
+            frame_bits++;
+        }
         /* coupling */
         if (s->channel_mode > AC3_CHMODE_MONO) {
             frame_bits++;
@@ -1736,20 +1760,145 @@ int ff_ac3_validate_metadata(AC3EncodeContext *s)
     AVCodecContext *avctx = s->avctx;
     AC3EncOptions *opt = &s->options;
 
-    /* validate mixing levels */
+    opt->audio_production_info = 0;
-    if (s->has_center) {
+    opt->extended_bsi_1        = 0;
-        validate_mix_level(avctx, "center_mix_level", &opt->center_mix_level,
+    opt->extended_bsi_2        = 0;
-                           cmixlev_options, CMIXLEV_NUM_OPTIONS, 1, 0,
+    opt->eac3_mixing_metadata  = 0;
-                           &s->center_mix_level);
+    opt->eac3_info_metadata    = 0;
+
+    /* determine mixing metadata / xbsi1 use */
+    if (s->channel_mode > AC3_CHMODE_STEREO && opt->preferred_stereo_downmix >= 0) {
+        opt->extended_bsi_1       = 1;
+        opt->eac3_mixing_metadata = 1;
     }
-    if (s->has_surround) {
+    if (s->has_center &&
-        validate_mix_level(avctx, "surround_mix_level", &opt->surround_mix_level,
+        (opt->ltrt_center_mix_level >= 0 || opt->loro_center_mix_level >= 0)) {
-                           surmixlev_options, SURMIXLEV_NUM_OPTIONS, 1, 0,
+        opt->extended_bsi_1       = 1;
-                           &s->surround_mix_level);
+        opt->eac3_mixing_metadata = 1;
+    }
+    if (s->has_surround &&
+        (opt->ltrt_surround_mix_level >= 0 || opt->loro_surround_mix_level >= 0)) {
+        opt->extended_bsi_1       = 1;
+        opt->eac3_mixing_metadata = 1;
     }
 
-    /* set audio production info flag */
+    if (s->eac3) {
-    if (opt->mixing_level >= 0 || opt->room_type >= 0) {
+        /* determine info metadata use */
+        if (avctx->audio_service_type != AV_AUDIO_SERVICE_TYPE_MAIN)
+            opt->eac3_info_metadata = 1;
+        if (opt->copyright >= 0 || opt->original >= 0)
+            opt->eac3_info_metadata = 1;
+        if (s->channel_mode == AC3_CHMODE_STEREO &&
+            (opt->dolby_headphone_mode >= 0 || opt->dolby_surround_mode >= 0))
+            opt->eac3_info_metadata = 1;
+        if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode >= 0)
+            opt->eac3_info_metadata = 1;
+        if (opt->mixing_level >= 0 || opt->room_type >= 0 || opt->ad_converter_type >= 0) {
+            opt->audio_production_info = 1;
+            opt->eac3_info_metadata    = 1;
+        }
+    } else {
+        /* determine audio production info use */
+        if (opt->mixing_level >= 0 || opt->room_type >= 0)
+            opt->audio_production_info = 1;
+
+        /* determine xbsi2 use */
+        if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode >= 0)
+            opt->extended_bsi_2 = 1;
+        if (s->channel_mode == AC3_CHMODE_STEREO && opt->dolby_headphone_mode >= 0)
+            opt->extended_bsi_2 = 1;
+        if (opt->ad_converter_type >= 0)
+            opt->extended_bsi_2 = 1;
+    }
+
+    /* validate AC-3 mixing levels */
+    if (!s->eac3) {
+        if (s->has_center) {
+            validate_mix_level(avctx, "center_mix_level", &opt->center_mix_level,
+                            cmixlev_options, CMIXLEV_NUM_OPTIONS, 1, 0,
+                            &s->center_mix_level);
+        }
+        if (s->has_surround) {
+            validate_mix_level(avctx, "surround_mix_level", &opt->surround_mix_level,
+                            surmixlev_options, SURMIXLEV_NUM_OPTIONS, 1, 0,
+                            &s->surround_mix_level);
+        }
+    }
+
+    /* validate extended bsi 1 / mixing metadata */
+    if (opt->extended_bsi_1 || opt->eac3_mixing_metadata) {
+        /* default preferred stereo downmix */
+        if (opt->preferred_stereo_downmix < 0)
+            opt->preferred_stereo_downmix = 0;
+        if (!s->eac3 || s->has_center) {
+            /* validate Lt/Rt center mix level */
+            validate_mix_level(avctx, "ltrt_center_mix_level",
+                               &opt->ltrt_center_mix_level, extmixlev_options,
+                               EXTMIXLEV_NUM_OPTIONS, 5, 0,
+                               &s->ltrt_center_mix_level);
+            /* validate Lo/Ro center mix level */
+            validate_mix_level(avctx, "loro_center_mix_level",
+                               &opt->loro_center_mix_level, extmixlev_options,
+                               EXTMIXLEV_NUM_OPTIONS, 5, 0,
+                               &s->loro_center_mix_level);
+        }
+        if (!s->eac3 || s->has_surround) {
+            /* validate Lt/Rt surround mix level */
+            validate_mix_level(avctx, "ltrt_surround_mix_level",
+                               &opt->ltrt_surround_mix_level, extmixlev_options,
+                               EXTMIXLEV_NUM_OPTIONS, 6, 3,
+                               &s->ltrt_surround_mix_level);
+            /* validate Lo/Ro surround mix level */
+            validate_mix_level(avctx, "loro_surround_mix_level",
+                               &opt->loro_surround_mix_level, extmixlev_options,
+                               EXTMIXLEV_NUM_OPTIONS, 6, 3,
+                               &s->loro_surround_mix_level);
+        }
+    }
+
+    /* validate audio service type / channels combination */
+    if ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_KARAOKE &&
+         avctx->channels == 1) ||
+        ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_COMMENTARY ||
+          avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_EMERGENCY  ||
+          avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_VOICE_OVER)
+         && avctx->channels > 1)) {
+        av_log(avctx, AV_LOG_ERROR, "invalid audio service type for the "
+                                    "specified number of channels\n");
+        return AVERROR(EINVAL);
+    }
+
+    /* validate extended bsi 2 / info metadata */
+    if (opt->extended_bsi_2 || opt->eac3_info_metadata) {
+        /* default dolby headphone mode */
+        if (opt->dolby_headphone_mode < 0)
+            opt->dolby_headphone_mode = 0;
+        /* default dolby surround ex mode */
+        if (opt->dolby_surround_ex_mode < 0)
+            opt->dolby_surround_ex_mode = 0;
+        /* default A/D converter type */
+        if (opt->ad_converter_type < 0)
+            opt->ad_converter_type = 0;
+    }
+
+    /* copyright & original defaults */
+    if (!s->eac3 || opt->eac3_info_metadata) {
+        /* default copyright */
+        if (opt->copyright < 0)
+            opt->copyright = 0;
+        /* default original */
+        if (opt->original < 0)
+            opt->original = 1;
+    }
+
+    /* dolby surround mode default */
+    if (!s->eac3 || opt->eac3_info_metadata) {
+        if (opt->dolby_surround_mode < 0)
+            opt->dolby_surround_mode = 0;
+    }
+
+    /* validate audio production info */
+    if (opt->audio_production_info) {
         if (opt->mixing_level < 0) {
             av_log(avctx, AV_LOG_ERROR, "mixing_level must be set if "
                    "room_type is set\n");
@@ -1763,66 +1912,10 @@ int ff_ac3_validate_metadata(AC3EncodeContext *s)
         /* default room type */
         if (opt->room_type < 0)
             opt->room_type = 0;
-        opt->audio_production_info = 1;
-    } else {
-        opt->audio_production_info = 0;
-    }
-
-    /* set extended bsi 1 flag */
-    if ((s->has_center || s->has_surround) &&
-        (opt->preferred_stereo_downmix >= 0 ||
-         opt->ltrt_center_mix_level   >= 0 ||
-         opt->ltrt_surround_mix_level >= 0 ||
-         opt->loro_center_mix_level   >= 0 ||
-         opt->loro_surround_mix_level >= 0)) {
-        /* default preferred stereo downmix */
-        if (opt->preferred_stereo_downmix < 0)
-            opt->preferred_stereo_downmix = 0;
-        /* validate Lt/Rt center mix level */
-        validate_mix_level(avctx, "ltrt_center_mix_level",
-                           &opt->ltrt_center_mix_level, extmixlev_options,
-                           EXTMIXLEV_NUM_OPTIONS, 5, 0,
-                           &s->ltrt_center_mix_level);
-        /* validate Lt/Rt surround mix level */
-        validate_mix_level(avctx, "ltrt_surround_mix_level",
-                           &opt->ltrt_surround_mix_level, extmixlev_options,
-                           EXTMIXLEV_NUM_OPTIONS, 6, 3,
-                           &s->ltrt_surround_mix_level);
-        /* validate Lo/Ro center mix level */
-        validate_mix_level(avctx, "loro_center_mix_level",
-                           &opt->loro_center_mix_level, extmixlev_options,
-                           EXTMIXLEV_NUM_OPTIONS, 5, 0,
-                           &s->loro_center_mix_level);
-        /* validate Lo/Ro surround mix level */
-        validate_mix_level(avctx, "loro_surround_mix_level",
-                           &opt->loro_surround_mix_level, extmixlev_options,
-                           EXTMIXLEV_NUM_OPTIONS, 6, 3,
-                           &s->loro_surround_mix_level);
-        opt->extended_bsi_1 = 1;
-    } else {
-        opt->extended_bsi_1 = 0;
-    }
-
-    /* set extended bsi 2 flag */
-    if (opt->dolby_surround_ex_mode >= 0 ||
-        opt->dolby_headphone_mode   >= 0 ||
-        opt->ad_converter_type      >= 0) {
-        /* default dolby surround ex mode */
-        if (opt->dolby_surround_ex_mode < 0)
-            opt->dolby_surround_ex_mode = 0;
-        /* default dolby headphone mode */
-        if (opt->dolby_headphone_mode < 0)
-            opt->dolby_headphone_mode = 0;
-        /* default A/D converter type */
-        if (opt->ad_converter_type < 0)
-            opt->ad_converter_type = 0;
-        opt->extended_bsi_2 = 1;
-    } else {
-        opt->extended_bsi_2 = 0;
     }
 
     /* set bitstream id for alternate bitstream syntax */
-    if (opt->extended_bsi_1 || opt->extended_bsi_2) {
+    if (!s->eac3 && (opt->extended_bsi_1 || opt->extended_bsi_2)) {
         if (s->bitstream_id > 8 && s->bitstream_id < 11) {
             static int warn_once = 1;
             if (warn_once) {
@@ -2041,23 +2134,9 @@ static av_cold int validate_options(AC3EncodeContext *s)
     if (s->cutoff > (s->sample_rate >> 1))
         s->cutoff = s->sample_rate >> 1;
 
-    /* validate audio service type / channels combination */
-    if ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_KARAOKE &&
-         avctx->channels == 1) ||
-        ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_COMMENTARY ||
-          avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_EMERGENCY  ||
-          avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_VOICE_OVER)
-         && avctx->channels > 1)) {
-        av_log(avctx, AV_LOG_ERROR, "invalid audio service type for the "
-                                    "specified number of channels\n");
-        return AVERROR(EINVAL);
-    }
-
-    if (!s->eac3) {
         ret = ff_ac3_validate_metadata(s);
         if (ret)
             return ret;
-    }
 
     s->rematrixing_enabled = s->options.stereo_rematrixing &&
                              (s->channel_mode == AC3_CHMODE_STEREO);

libavcodec/ac3enc.h

@@ -91,6 +91,8 @@ typedef struct AC3EncOptions {
     int dolby_surround_ex_mode;
     int dolby_headphone_mode;
     int ad_converter_type;
+    int eac3_mixing_metadata;
+    int eac3_info_metadata;
 
     /* other encoding options */
     int allow_per_frame_metadata;

libavcodec/ac3enc_opts_template.c

@@ -29,12 +29,13 @@ static const AVOption ac3_options[] = {
 #else /* AC3ENC_TYPE_EAC3 */
 static const AVOption eac3_options[] = {
 #endif
-#if AC3ENC_TYPE != AC3ENC_TYPE_EAC3
 /* Metadata Options */
 {"per_frame_metadata", "Allow Changing Metadata Per-Frame", OFFSET(allow_per_frame_metadata), FF_OPT_TYPE_INT, {.dbl = 0 }, 0, 1, AC3ENC_PARAM},
-/* downmix levels */
+#if AC3ENC_TYPE != AC3ENC_TYPE_EAC3
+/* AC-3 downmix levels */
 {"center_mixlev", "Center Mix Level", OFFSET(center_mix_level), FF_OPT_TYPE_FLOAT, {.dbl = LEVEL_MINUS_4POINT5DB }, 0.0, 1.0, AC3ENC_PARAM},
 {"surround_mixlev", "Surround Mix Level", OFFSET(surround_mix_level), FF_OPT_TYPE_FLOAT, {.dbl = LEVEL_MINUS_6DB }, 0.0, 1.0, AC3ENC_PARAM},
+#endif
 /* audio production information */
 {"mixing_level", "Mixing Level", OFFSET(mixing_level), FF_OPT_TYPE_INT, {.dbl = -1 }, -1, 111, AC3ENC_PARAM},
 {"room_type", "Room Type", OFFSET(room_type), FF_OPT_TYPE_INT, {.dbl = -1 }, -1, 2, AC3ENC_PARAM, "room_type"},
@@ -42,15 +43,13 @@ static const AVOption eac3_options[] = {
     {"large",        "Large Room",              0, FF_OPT_TYPE_CONST, {.dbl = 1 }, INT_MIN, INT_MAX, AC3ENC_PARAM, "room_type"},
     {"small",        "Small Room",              0, FF_OPT_TYPE_CONST, {.dbl = 2 }, INT_MIN, INT_MAX, AC3ENC_PARAM, "room_type"},
 /* other metadata options */
-{"copyright", "Copyright Bit", OFFSET(copyright), FF_OPT_TYPE_INT, {.dbl = 0 }, 0, 1, AC3ENC_PARAM},
+{"copyright", "Copyright Bit", OFFSET(copyright), FF_OPT_TYPE_INT, {.dbl = -1 }, -1, 1, AC3ENC_PARAM},
-#endif
 {"dialnorm", "Dialogue Level (dB)", OFFSET(dialogue_level), FF_OPT_TYPE_INT, {.dbl = -31 }, -31, -1, AC3ENC_PARAM},
-#if AC3ENC_TYPE != AC3ENC_TYPE_EAC3
+{"dsur_mode", "Dolby Surround Mode", OFFSET(dolby_surround_mode), FF_OPT_TYPE_INT, {.dbl = -1 }, -1, 2, AC3ENC_PARAM, "dsur_mode"},
-{"dsur_mode", "Dolby Surround Mode", OFFSET(dolby_surround_mode), FF_OPT_TYPE_INT, {.dbl = 0 }, 0, 2, AC3ENC_PARAM, "dsur_mode"},
     {"notindicated", "Not Indicated (default)",    0, FF_OPT_TYPE_CONST, {.dbl = 0 }, INT_MIN, INT_MAX, AC3ENC_PARAM, "dsur_mode"},
     {"on",           "Dolby Surround Encoded",     0, FF_OPT_TYPE_CONST, {.dbl = 1 }, INT_MIN, INT_MAX, AC3ENC_PARAM, "dsur_mode"},
     {"off",          "Not Dolby Surround Encoded", 0, FF_OPT_TYPE_CONST, {.dbl = 2 }, INT_MIN, INT_MAX, AC3ENC_PARAM, "dsur_mode"},
-{"original", "Original Bit Stream", OFFSET(original), FF_OPT_TYPE_INT,   {.dbl = 1 }, 0, 1, AC3ENC_PARAM},
+{"original", "Original Bit Stream", OFFSET(original), FF_OPT_TYPE_INT,   {.dbl = -1 }, -1, 1, AC3ENC_PARAM},
 /* extended bitstream information */
 {"dmix_mode", "Preferred Stereo Downmix Mode", OFFSET(preferred_stereo_downmix), FF_OPT_TYPE_INT, {.dbl = -1 }, -1, 2, AC3ENC_PARAM, "dmix_mode"},
     {"notindicated", "Not Indicated (default)", 0, FF_OPT_TYPE_CONST, {.dbl = 0 }, INT_MIN, INT_MAX, AC3ENC_PARAM, "dmix_mode"},
@@ -71,7 +70,6 @@ static const AVOption eac3_options[] = {
 {"ad_conv_type", "A/D Converter Type", OFFSET(ad_converter_type), FF_OPT_TYPE_INT, {.dbl = -1 }, -1, 1, AC3ENC_PARAM, "ad_conv_type"},
     {"standard", "Standard (default)", 0, FF_OPT_TYPE_CONST, {.dbl = 0 }, INT_MIN, INT_MAX, AC3ENC_PARAM, "ad_conv_type"},
     {"hdcd",     "HDCD",               0, FF_OPT_TYPE_CONST, {.dbl = 1 }, INT_MIN, INT_MAX, AC3ENC_PARAM, "ad_conv_type"},
-#endif
 /* Other Encoding Options */
 {"stereo_rematrixing", "Stereo Rematrixing", OFFSET(stereo_rematrixing), FF_OPT_TYPE_INT, {.dbl = 1 }, 0, 1, AC3ENC_PARAM},
 #if AC3ENC_TYPE != AC3ENC_TYPE_AC3_FIXED

libavcodec/ac3enc_template.c

@@ -423,7 +423,7 @@ int AC3_NAME(encode_frame)(AVCodecContext *avctx, unsigned char *frame,
     const SampleType *samples = data;
     int ret;
 
-    if (!s->eac3 && s->options.allow_per_frame_metadata) {
+    if (s->options.allow_per_frame_metadata) {
         ret = ff_ac3_validate_metadata(s);
         if (ret)
             return ret;

libavcodec/eac3enc.c

@@ -142,10 +142,48 @@ void ff_eac3_output_frame_header(AC3EncodeContext *s)
     put_bits(&s->pb, 5, s->bitstream_id);           /* bitstream id (EAC3=16) */
     put_bits(&s->pb, 5, -opt->dialogue_level);      /* dialogue normalization level */
     put_bits(&s->pb, 1, 0);                         /* no compression gain */
-    put_bits(&s->pb, 1, 0);                         /* no mixing metadata */
+    /* mixing metadata*/
-    /* TODO: mixing metadata */
+    put_bits(&s->pb, 1, opt->eac3_mixing_metadata);
-    put_bits(&s->pb, 1, 0);                         /* no info metadata */
+    if (opt->eac3_mixing_metadata) {
-    /* TODO: info metadata */
+        if (s->channel_mode > AC3_CHMODE_STEREO)
+            put_bits(&s->pb, 2, opt->preferred_stereo_downmix);
+        if (s->has_center) {
+            put_bits(&s->pb, 3, s->ltrt_center_mix_level);
+            put_bits(&s->pb, 3, s->loro_center_mix_level);
+        }
+        if (s->has_surround) {
+            put_bits(&s->pb, 3, s->ltrt_surround_mix_level);
+            put_bits(&s->pb, 3, s->loro_surround_mix_level);
+        }
+        if (s->lfe_on)
+            put_bits(&s->pb, 1, 0);
+        put_bits(&s->pb, 1, 0);                     /* no program scale */
+        put_bits(&s->pb, 1, 0);                     /* no ext program scale */
+        put_bits(&s->pb, 2, 0);                     /* no mixing parameters */
+        if (s->channel_mode < AC3_CHMODE_STEREO)
+            put_bits(&s->pb, 1, 0);                 /* no pan info */
+        put_bits(&s->pb, 1, 0);                     /* no frame mix config info */
+    }
+    /* info metadata*/
+    put_bits(&s->pb, 1, opt->eac3_info_metadata);
+    if (opt->eac3_info_metadata) {
+        put_bits(&s->pb, 3, s->bitstream_mode);
+        put_bits(&s->pb, 1, opt->copyright);
+        put_bits(&s->pb, 1, opt->original);
+        if (s->channel_mode == AC3_CHMODE_STEREO) {
+            put_bits(&s->pb, 2, opt->dolby_surround_mode);
+            put_bits(&s->pb, 2, opt->dolby_headphone_mode);
+        }
+        if (s->channel_mode >= AC3_CHMODE_2F2R)
+            put_bits(&s->pb, 2, opt->dolby_surround_ex_mode);
+        put_bits(&s->pb, 1, opt->audio_production_info);
+        if (opt->audio_production_info) {
+            put_bits(&s->pb, 5, opt->mixing_level - 80);
+            put_bits(&s->pb, 2, opt->room_type);
+            put_bits(&s->pb, 1, opt->ad_converter_type);
+        }
+        put_bits(&s->pb, 1, 0);
+    }
     if (s->num_blocks != 6)
         put_bits(&s->pb, 1, !(s->avctx->frame_number % 6)); /* converter sync flag */
     put_bits(&s->pb, 1, 0);                         /* no additional bit stream info */